You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hive.apache.org by vi...@apache.org on 2018/07/19 19:55:36 UTC

[37/51] [partial] hive git commit: HIVE-20188 : Split server-specific code outside of standalone metastore-common (Alexander Kolbasov reviewed by Vihang Karajgaonkar)

http://git-wip-us.apache.org/repos/asf/hive/blob/081fa368/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartFilterExprUtil.java
----------------------------------------------------------------------
diff --git a/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartFilterExprUtil.java b/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartFilterExprUtil.java
deleted file mode 100644
index 2fcc162..0000000
--- a/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartFilterExprUtil.java
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.hive.metastore;
-
-import org.antlr.runtime.CommonTokenStream;
-import org.antlr.runtime.RecognitionException;
-import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
-import org.apache.hadoop.hive.metastore.conf.MetastoreConf.ConfVars;
-import org.apache.hadoop.hive.metastore.utils.JavaUtils;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hive.metastore.api.MetaException;
-import org.apache.hadoop.hive.metastore.parser.ExpressionTree;
-import org.apache.hadoop.hive.metastore.parser.FilterLexer;
-import org.apache.hadoop.hive.metastore.parser.FilterParser;
-import org.apache.hadoop.hive.metastore.parser.ExpressionTree.ANTLRNoCaseStringStream;
-import org.apache.hadoop.hive.metastore.parser.ExpressionTree.LeafNode;
-import org.apache.hadoop.hive.metastore.parser.ExpressionTree.Operator;
-
-/**
- * Utility functions for working with partition filter expressions
- */
-public class PartFilterExprUtil {
-  private static final Logger LOG = LoggerFactory.getLogger(PartFilterExprUtil.class.getName());
-
-
-  public static ExpressionTree makeExpressionTree(PartitionExpressionProxy expressionProxy,
-      byte[] expr) throws MetaException {
-    // We will try pushdown first, so make the filter. This will also validate the expression,
-    // if serialization fails we will throw incompatible metastore error to the client.
-    String filter = null;
-    try {
-      filter = expressionProxy.convertExprToFilter(expr);
-    } catch (MetaException ex) {
-      // TODO MS-SPLIT - for now we have construct this by reflection because IMetaStoreClient
-      // can't be
-      // moved until after HiveMetaStore is moved, which can't be moved until this is moved.
-      Class<? extends MetaException> exClass = JavaUtils.getClass(
-          "org.apache.hadoop.hive.metastore.IMetaStoreClient$IncompatibleMetastoreException",
-          MetaException.class);
-      throw JavaUtils.newInstance(exClass, new Class<?>[]{String.class}, new Object[]{ex.getMessage()});
-    }
-
-    // Make a tree out of the filter.
-    // TODO: this is all pretty ugly. The only reason we need all these transformations
-    //       is to maintain support for simple filters for HCat users that query metastore.
-    //       If forcing everyone to use thick client is out of the question, maybe we could
-    //       parse the filter into standard hive expressions and not all this separate tree
-    //       Filter.g stuff. That way this method and ...ByFilter would just be merged.
-    return PartFilterExprUtil.makeExpressionTree(filter);
-  }
-
-
-  /**
-   * Creates the proxy used to evaluate expressions. This is here to prevent circular
-   * dependency - ql -&gt; metastore client &lt;-&gt; metastore server -&gt; ql. If server and
-   * client are split, this can be removed.
-   * @param conf Configuration.
-   * @return The partition expression proxy.
-   */
-  public static PartitionExpressionProxy createExpressionProxy(Configuration conf) {
-    String className = MetastoreConf.getVar(conf, ConfVars.EXPRESSION_PROXY_CLASS);
-    try {
-      @SuppressWarnings("unchecked")
-      Class<? extends PartitionExpressionProxy> clazz =
-          JavaUtils.getClass(className, PartitionExpressionProxy.class);
-      return JavaUtils.newInstance(
-          clazz, new Class<?>[0], new Object[0]);
-    } catch (MetaException e) {
-      if (e.getMessage().matches(".* class not found")) {
-        // TODO MS-SPLIT For now if we cannot load the default PartitionExpressionForMetastore
-        // class (since it's from ql) load the DefaultPartitionExpressionProxy, which just throws
-        // UnsupportedOperationExceptions.  This allows existing Hive instances to work but also
-        // allows us to instantiate the metastore stand alone for testing.  Not sure if this is
-        // the best long term solution.
-        return new DefaultPartitionExpressionProxy();
-      }
-      LOG.error("Error loading PartitionExpressionProxy", e);
-      throw new RuntimeException("Error loading PartitionExpressionProxy: " + e.getMessage());
-    }
-  }
-
-  /**
-   * Makes expression tree out of expr.
-   * @param filter Filter.
-   * @return Expression tree. Null if there was an error.
-   */
-  private static ExpressionTree makeExpressionTree(String filter) throws MetaException {
-    // TODO: ExprNodeDesc is an expression tree, we could just use that and be rid of Filter.g.
-    if (filter == null || filter.isEmpty()) {
-      return ExpressionTree.EMPTY_TREE;
-    }
-    LOG.debug("Filter specified is " + filter);
-    ExpressionTree tree = null;
-    try {
-      tree = getFilterParser(filter).tree;
-    } catch (MetaException ex) {
-      LOG.info("Unable to make the expression tree from expression string ["
-          + filter + "]" + ex.getMessage()); // Don't log the stack, this is normal.
-    }
-    if (tree == null) {
-      return null;
-    }
-    // We suspect that LIKE pushdown into JDO is invalid; see HIVE-5134. Check for like here.
-    LikeChecker lc = new LikeChecker();
-    tree.accept(lc);
-    return lc.hasLike() ? null : tree;
-  }
-
-
-  private static class LikeChecker extends ExpressionTree.TreeVisitor {
-    private boolean hasLike;
-
-    public boolean hasLike() {
-      return hasLike;
-    }
-
-    @Override
-    protected boolean shouldStop() {
-      return hasLike;
-    }
-
-    @Override
-    protected void visit(LeafNode node) throws MetaException {
-      hasLike = hasLike || (node.operator == Operator.LIKE);
-    }
-  }
-
-  public static FilterParser getFilterParser(String filter) throws MetaException {
-    FilterLexer lexer = new FilterLexer(new ANTLRNoCaseStringStream(filter));
-    CommonTokenStream tokens = new CommonTokenStream(lexer);
-
-    FilterParser parser = new FilterParser(tokens);
-    try {
-      parser.filter();
-    } catch(RecognitionException re) {
-      throw new MetaException("Error parsing partition filter; lexer error: "
-          + lexer.errorMsg + "; exception " + re);
-    }
-
-    if (lexer.errorMsg != null) {
-      throw new MetaException("Error parsing partition filter : " + lexer.errorMsg);
-    }
-    return parser;
-  }
-
-
-}

http://git-wip-us.apache.org/repos/asf/hive/blob/081fa368/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartitionExpressionProxy.java
----------------------------------------------------------------------
diff --git a/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartitionExpressionProxy.java b/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartitionExpressionProxy.java
deleted file mode 100644
index 105511d..0000000
--- a/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/PartitionExpressionProxy.java
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.hive.metastore;
-
-import java.util.List;
-
-import org.apache.hadoop.hive.metastore.api.FieldSchema;
-import org.apache.hadoop.hive.metastore.api.FileMetadataExprType;
-import org.apache.hadoop.hive.metastore.api.MetaException;
-import org.apache.hadoop.hive.ql.io.sarg.SearchArgument;
-
-/**
- * The proxy interface that metastore uses for variety of QL operations (metastore can't depend
- * on QL because QL depends on metastore; creating metastore-client module would be a proper way
- * to solve this problem).
- */
-public interface PartitionExpressionProxy {
-
-  /**
-   * Converts serialized Hive expression into filter in the format suitable for Filter.g.
-   * @param expr Serialized expression.
-   * @return The filter string.
-   */
-  public String convertExprToFilter(byte[] expr) throws MetaException;
-
-  /**
-   * Filters the partition names via serialized Hive expression.
-   * @param partColumns Partition columns in the underlying table.
-   * @param expr Serialized expression.
-   * @param defaultPartitionName Default partition name from job or server configuration.
-   * @param partitionNames Partition names; the list is modified in place.
-   * @return Whether there were any unknown partitions preserved in the name list.
-   */
-  boolean filterPartitionsByExpr(List<FieldSchema> partColumns,
-      byte[] expr, String defaultPartitionName, List<String> partitionNames) throws MetaException;
-
-  /**
-   * Determines the file metadata type from input format of the source table or partition.
-   * @param inputFormat Input format name.
-   * @return The file metadata type.
-   */
-  FileMetadataExprType getMetadataType(String inputFormat);
-
-  /**
-   * Gets a separate proxy that can be used to call file-format-specific methods.
-   * @param type The file metadata type.
-   * @return The proxy.
-   */
-  FileFormatProxy getFileFormatProxy(FileMetadataExprType type);
-
-  /**
-   * Creates SARG from serialized representation.
-   * @param expr SARG, serialized as Kryo.
-   * @return SARG.
-   */
-  SearchArgument createSarg(byte[] expr);
-}

http://git-wip-us.apache.org/repos/asf/hive/blob/081fa368/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/RawStore.java
----------------------------------------------------------------------
diff --git a/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/RawStore.java b/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/RawStore.java
deleted file mode 100644
index 73a518d..0000000
--- a/standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/RawStore.java
+++ /dev/null
@@ -1,1682 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.hive.metastore;
-
-import org.apache.hadoop.hive.common.TableName;
-import org.apache.hadoop.hive.metastore.api.CreationMetadata;
-import org.apache.hadoop.hive.metastore.api.ISchemaName;
-import org.apache.hadoop.hive.metastore.api.SchemaVersionDescriptor;
-import org.apache.hadoop.hive.metastore.api.WMFullResourcePlan;
-import org.apache.hadoop.hive.metastore.api.WriteEventInfo;
-
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-import java.nio.ByteBuffer;
-import java.util.List;
-import java.util.Map;
-
-import org.apache.hadoop.classification.InterfaceStability;
-import org.apache.hadoop.conf.Configurable;
-import org.apache.hadoop.hive.metastore.api.AggrStats;
-import org.apache.hadoop.hive.metastore.api.AlreadyExistsException;
-import org.apache.hadoop.hive.metastore.api.Catalog;
-import org.apache.hadoop.hive.metastore.api.ColumnStatistics;
-import org.apache.hadoop.hive.metastore.api.CurrentNotificationEventId;
-import org.apache.hadoop.hive.metastore.api.Database;
-import org.apache.hadoop.hive.metastore.api.FieldSchema;
-import org.apache.hadoop.hive.metastore.api.FileMetadataExprType;
-import org.apache.hadoop.hive.metastore.api.Function;
-import org.apache.hadoop.hive.metastore.api.HiveObjectPrivilege;
-import org.apache.hadoop.hive.metastore.api.HiveObjectRef;
-import org.apache.hadoop.hive.metastore.api.ISchema;
-import org.apache.hadoop.hive.metastore.api.InvalidInputException;
-import org.apache.hadoop.hive.metastore.api.InvalidObjectException;
-import org.apache.hadoop.hive.metastore.api.InvalidOperationException;
-import org.apache.hadoop.hive.metastore.api.InvalidPartitionException;
-import org.apache.hadoop.hive.metastore.api.MetaException;
-import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
-import org.apache.hadoop.hive.metastore.api.NotificationEvent;
-import org.apache.hadoop.hive.metastore.api.NotificationEventRequest;
-import org.apache.hadoop.hive.metastore.api.NotificationEventResponse;
-import org.apache.hadoop.hive.metastore.api.NotificationEventsCountRequest;
-import org.apache.hadoop.hive.metastore.api.NotificationEventsCountResponse;
-import org.apache.hadoop.hive.metastore.api.Partition;
-import org.apache.hadoop.hive.metastore.api.PartitionEventType;
-import org.apache.hadoop.hive.metastore.api.PartitionValuesResponse;
-import org.apache.hadoop.hive.metastore.api.PrincipalPrivilegeSet;
-import org.apache.hadoop.hive.metastore.api.PrincipalType;
-import org.apache.hadoop.hive.metastore.api.PrivilegeBag;
-import org.apache.hadoop.hive.metastore.api.Role;
-import org.apache.hadoop.hive.metastore.api.RolePrincipalGrant;
-import org.apache.hadoop.hive.metastore.api.RuntimeStat;
-import org.apache.hadoop.hive.metastore.api.SQLCheckConstraint;
-import org.apache.hadoop.hive.metastore.api.SQLDefaultConstraint;
-import org.apache.hadoop.hive.metastore.api.SQLForeignKey;
-import org.apache.hadoop.hive.metastore.api.SQLNotNullConstraint;
-import org.apache.hadoop.hive.metastore.api.SQLPrimaryKey;
-import org.apache.hadoop.hive.metastore.api.SQLUniqueConstraint;
-import org.apache.hadoop.hive.metastore.api.SchemaVersion;
-import org.apache.hadoop.hive.metastore.api.SerDeInfo;
-import org.apache.hadoop.hive.metastore.api.Table;
-import org.apache.hadoop.hive.metastore.api.TableMeta;
-import org.apache.hadoop.hive.metastore.api.Type;
-import org.apache.hadoop.hive.metastore.api.UnknownDBException;
-import org.apache.hadoop.hive.metastore.api.UnknownPartitionException;
-import org.apache.hadoop.hive.metastore.api.UnknownTableException;
-import org.apache.hadoop.hive.metastore.api.WMMapping;
-import org.apache.hadoop.hive.metastore.api.WMNullablePool;
-import org.apache.hadoop.hive.metastore.api.WMNullableResourcePlan;
-import org.apache.hadoop.hive.metastore.api.WMPool;
-import org.apache.hadoop.hive.metastore.api.WMResourcePlan;
-import org.apache.hadoop.hive.metastore.api.WMTrigger;
-import org.apache.hadoop.hive.metastore.api.WMValidateResourcePlanResponse;
-import org.apache.hadoop.hive.metastore.partition.spec.PartitionSpecProxy;
-import org.apache.hadoop.hive.metastore.utils.MetaStoreUtils.ColStatsObjWithSourceInfo;
-import org.apache.thrift.TException;
-
-public interface RawStore extends Configurable {
-
-  /***
-   * Annotation to skip retries
-   */
-  @Target(value = ElementType.METHOD)
-  @Retention(value = RetentionPolicy.RUNTIME)
-  @interface CanNotRetry {
-  }
-
-  void shutdown();
-
-  /**
-   * Opens a new one or the one already created Every call of this function must
-   * have corresponding commit or rollback function call
-   *
-   * @return an active transaction
-   */
-
-  boolean openTransaction();
-
-  /**
-   * if this is the commit of the first open call then an actual commit is
-   * called.
-   *
-   * @return true or false
-   */
-  @CanNotRetry
-  boolean commitTransaction();
-
-  boolean isActiveTransaction();
-
-  /**
-   * Rolls back the current transaction if it is active
-   */
-  @CanNotRetry
-  void rollbackTransaction();
-
-  /**
-   * Create a new catalog.
-   * @param cat Catalog to create.
-   * @throws MetaException if something goes wrong, usually in storing it to the database.
-   */
-  void createCatalog(Catalog cat) throws MetaException;
-
-  /**
-   * Alter an existing catalog.  Only description and location can be changed, and the change of
-   * location is for internal use only.
-   * @param catName name of the catalog to alter.
-   * @param cat new version of the catalog.
-   * @throws MetaException something went wrong, usually in the database.
-   * @throws InvalidOperationException attempt to change something about the catalog that is not
-   * changeable, like the name.
-   */
-  void alterCatalog(String catName, Catalog cat) throws MetaException, InvalidOperationException;
-
-  /**
-   * Get a catalog.
-   * @param catalogName name of the catalog.
-   * @return The catalog.
-   * @throws NoSuchObjectException no catalog of this name exists.
-   * @throws MetaException if something goes wrong, usually in reading it from the database.
-   */
-  Catalog getCatalog(String catalogName) throws NoSuchObjectException, MetaException;
-
-  /**
-   * Get all the catalogs.
-   * @return list of names of all catalogs in the system
-   * @throws MetaException if something goes wrong, usually in reading from the database.
-   */
-  List<String> getCatalogs() throws MetaException;
-
-  /**
-   * Drop a catalog.  The catalog must be empty.
-   * @param catalogName name of the catalog to drop.
-   * @throws NoSuchObjectException no catalog of this name exists.
-   * @throws MetaException could mean the catalog isn't empty, could mean general database error.
-   */
-  void dropCatalog(String catalogName) throws NoSuchObjectException, MetaException;
-
-  /**
-   * Create a database.
-   * @param db database to create.
-   * @throws InvalidObjectException not sure it actually ever throws this.
-   * @throws MetaException if something goes wrong, usually in writing it to the database.
-   */
-  void createDatabase(Database db)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Get a database.
-   * @param catalogName catalog the database is in.
-   * @param name name of the database.
-   * @return the database.
-   * @throws NoSuchObjectException if no such database exists.
-   */
-  Database getDatabase(String catalogName, String name)
-      throws NoSuchObjectException;
-
-  /**
-   * Drop a database.
-   * @param catalogName catalog the database is in.
-   * @param dbname name of the database.
-   * @return true if the database was dropped, pretty much always returns this if it returns.
-   * @throws NoSuchObjectException no database in this catalog of this name to drop
-   * @throws MetaException something went wrong, usually with the database.
-   */
-  boolean dropDatabase(String catalogName, String dbname)
-      throws NoSuchObjectException, MetaException;
-
-  /**
-   * Alter a database.
-   * @param catalogName name of the catalog the database is in.
-   * @param dbname name of the database to alter
-   * @param db new version of the database.  This should be complete as it will fully replace the
-   *          existing db object.
-   * @return true if the change succeeds, could fail due to db constraint violations.
-   * @throws NoSuchObjectException no database of this name exists to alter.
-   * @throws MetaException something went wrong, usually with the database.
-   */
-  boolean alterDatabase(String catalogName, String dbname, Database db)
-      throws NoSuchObjectException, MetaException;
-
-  /**
-   * Get all database in a catalog having names that match a pattern.
-   * @param catalogName name of the catalog to search for databases in
-   * @param pattern pattern names should match
-   * @return list of matching database names.
-   * @throws MetaException something went wrong, usually with the database.
-   */
-  List<String> getDatabases(String catalogName, String pattern) throws MetaException;
-
-  /**
-   * Get names of all the databases in a catalog.
-   * @param catalogName name of the catalog to search for databases in
-   * @return list of names of all databases in the catalog
-   * @throws MetaException something went wrong, usually with the database.
-   */
-  List<String> getAllDatabases(String catalogName) throws MetaException;
-
-  boolean createType(Type type);
-
-  Type getType(String typeName);
-
-  boolean dropType(String typeName);
-
-  void createTable(Table tbl) throws InvalidObjectException,
-      MetaException;
-
-  /**
-   * Drop a table.
-   * @param catalogName catalog the table is in
-   * @param dbName database the table is in
-   * @param tableName table name
-   * @return true if the table was dropped
-   * @throws MetaException something went wrong, usually in the RDBMS or storage
-   * @throws NoSuchObjectException No table of this name
-   * @throws InvalidObjectException Don't think this is ever actually thrown
-   * @throws InvalidInputException Don't think this is ever actually thrown
-   */
-  boolean dropTable(String catalogName, String dbName, String tableName)
-      throws MetaException, NoSuchObjectException, InvalidObjectException, InvalidInputException;
-
-  /**
-   * Get a table object.
-   * @param catalogName catalog the table is in.
-   * @param dbName database the table is in.
-   * @param tableName table name.
-   * @return table object, or null if no such table exists (wow it would be nice if we either
-   * consistently returned null or consistently threw NoSuchObjectException).
-   * @throws MetaException something went wrong in the RDBMS
-   */
-  Table getTable(String catalogName, String dbName, String tableName) throws MetaException;
-
-  /**
-   * Add a partition.
-   * @param part partition to add
-   * @return true if the partition was successfully added.
-   * @throws InvalidObjectException the provided partition object is not valid.
-   * @throws MetaException error writing to the RDBMS.
-   */
-  boolean addPartition(Partition part)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Add a list of partitions to a table.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param parts list of partitions to be added.
-   * @return true if the operation succeeded.
-   * @throws InvalidObjectException never throws this AFAICT
-   * @throws MetaException the partitions don't belong to the indicated table or error writing to
-   * the RDBMS.
-   */
-  boolean addPartitions(String catName, String dbName, String tblName, List<Partition> parts)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Add a list of partitions to a table.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param partitionSpec specification for the partition
-   * @param ifNotExists whether it is in an error if the partition already exists.  If true, then
-   *                   it is not an error if the partition exists, if false, it is.
-   * @return whether the partition was created.
-   * @throws InvalidObjectException The passed in partition spec or table specification is invalid.
-   * @throws MetaException error writing to RDBMS.
-   */
-  boolean addPartitions(String catName, String dbName, String tblName,
-                        PartitionSpecProxy partitionSpec, boolean ifNotExists)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Get a partition.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tableName table name.
-   * @param part_vals partition values for this table.
-   * @return the partition.
-   * @throws MetaException error reading from RDBMS.
-   * @throws NoSuchObjectException no partition matching this specification exists.
-   */
-  Partition getPartition(String catName, String dbName, String tableName,
-      List<String> part_vals) throws MetaException, NoSuchObjectException;
-
-  /**
-   * Check whether a partition exists.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tableName table name.
-   * @param partKeys list of partition keys used to generate the partition name.
-   * @param part_vals list of partition values.
-   * @return true if the partition exists, false otherwise.
-   * @throws MetaException failure reading RDBMS
-   * @throws NoSuchObjectException this is never thrown.
-   */
-  boolean doesPartitionExist(String catName, String dbName, String tableName,
-      List<FieldSchema> partKeys, List<String> part_vals)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * Drop a partition.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tableName table name.
-   * @param part_vals list of partition values.
-   * @return true if the partition was dropped.
-   * @throws MetaException Error accessing the RDBMS.
-   * @throws NoSuchObjectException no partition matching this description exists
-   * @throws InvalidObjectException error dropping the statistics for the partition
-   * @throws InvalidInputException error dropping the statistics for the partition
-   */
-  boolean dropPartition(String catName, String dbName, String tableName,
-      List<String> part_vals) throws MetaException, NoSuchObjectException, InvalidObjectException,
-      InvalidInputException;
-
-  /**
-   * Get some or all partitions for a table.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tableName table name
-   * @param max maximum number of partitions, or -1 to get all partitions.
-   * @return list of partitions
-   * @throws MetaException error access the RDBMS.
-   * @throws NoSuchObjectException no such table exists
-   */
-  List<Partition> getPartitions(String catName, String dbName,
-      String tableName, int max) throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get the location for every partition of a given table. If a partition location is a child of
-   * baseLocationToNotShow then the partitionName is returned, but the only null location is
-   * returned.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param baseLocationToNotShow Partition locations which are child of this path are omitted, and
-   *     null value returned instead.
-   * @param max The maximum number of partition locations returned, or -1 for all
-   * @return The map of the partitionName, location pairs
-   */
-  Map<String, String> getPartitionLocations(String catName, String dbName, String tblName,
-      String baseLocationToNotShow, int max);
-
-  /**
-   * Alter a table.
-   * @param catName catalog the table is in.
-   * @param dbname database the table is in.
-   * @param name name of the table.
-   * @param newTable New table object.  Which parts of the table can be altered are
-   *                 implementation specific.
-   * @throws InvalidObjectException The new table object is invalid.
-   * @throws MetaException something went wrong, usually in the RDBMS or storage.
-   */
-  void alterTable(String catName, String dbname, String name, Table newTable)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Update creation metadata for a materialized view.
-   * @param catName catalog name.
-   * @param dbname database name.
-   * @param tablename table name.
-   * @param cm new creation metadata
-   * @throws MetaException error accessing the RDBMS.
-   */
-  void updateCreationMetadata(String catName, String dbname, String tablename, CreationMetadata cm)
-      throws MetaException;
-
-  /**
-   * Get table names that match a pattern.
-   * @param catName catalog to search in
-   * @param dbName database to search in
-   * @param pattern pattern to match
-   * @return list of table names, if any
-   * @throws MetaException failure in querying the RDBMS
-   */
-  List<String> getTables(String catName, String dbName, String pattern)
-      throws MetaException;
-
-  /**
-   * Get table names that match a pattern.
-   * @param catName catalog to search in
-   * @param dbName database to search in
-   * @param pattern pattern to match
-   * @param tableType type of table to look for
-   * @return list of table names, if any
-   * @throws MetaException failure in querying the RDBMS
-   */
-  List<String> getTables(String catName, String dbName, String pattern, TableType tableType)
-      throws MetaException;
-
-  /**
-   * Get list of materialized views in a database.
-   * @param catName catalog name
-   * @param dbName database name
-   * @return names of all materialized views in the database
-   * @throws MetaException error querying the RDBMS
-   * @throws NoSuchObjectException no such database
-   */
-  List<String> getMaterializedViewsForRewriting(String catName, String dbName)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-
-   * @param catName catalog name to search in. Search must be confined to one catalog.
-   * @param dbNames databases to search in.
-   * @param tableNames names of tables to select.
-   * @param tableTypes types of tables to look for.
-   * @return list of matching table meta information.
-   * @throws MetaException failure in querying the RDBMS.
-   */
-  List<TableMeta> getTableMeta(String catName, String dbNames, String tableNames,
-                               List<String> tableTypes) throws MetaException;
-
-  /**
-   * @param catName catalog name
-   * @param dbname
-   *        The name of the database from which to retrieve the tables
-   * @param tableNames
-   *        The names of the tables to retrieve.
-   * @return A list of the tables retrievable from the database
-   *          whose names are in the list tableNames.
-   *         If there are duplicate names, only one instance of the table will be returned
-   * @throws MetaException failure in querying the RDBMS.
-   */
-  List<Table> getTableObjectsByName(String catName, String dbname, List<String> tableNames)
-      throws MetaException, UnknownDBException;
-
-  /**
-   * Get all tables in a database.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @return list of table names
-   * @throws MetaException failure in querying the RDBMS.
-   */
-  List<String> getAllTables(String catName, String dbName) throws MetaException;
-
-  /**
-   * Gets a list of tables based on a filter string and filter type.
-   * @param catName catalog name
-   * @param dbName
-   *          The name of the database from which you will retrieve the table names
-   * @param filter
-   *          The filter string
-   * @param max_tables
-   *          The maximum number of tables returned
-   * @return  A list of table names that match the desired filter
-   * @throws MetaException
-   * @throws UnknownDBException
-   */
-  List<String> listTableNamesByFilter(String catName, String dbName, String filter,
-                                      short max_tables) throws MetaException, UnknownDBException;
-
-  /**
-   * Get a partial or complete list of names for partitions of a table.
-   * @param catName catalog name.
-   * @param db_name database name.
-   * @param tbl_name table name.
-   * @param max_parts maximum number of partitions to retrieve, -1 for all.
-   * @return list of partition names.
-   * @throws MetaException there was an error accessing the RDBMS
-   */
-  List<String> listPartitionNames(String catName, String db_name,
-      String tbl_name, short max_parts) throws MetaException;
-
-  /**
-   * Get a list of partition values as one big struct.
-   * @param catName catalog name.
-   * @param db_name database name.
-   * @param tbl_name table name.
-   * @param cols partition key columns
-   * @param applyDistinct whether to apply distinct to the list
-   * @param filter filter to apply to the partition names
-   * @param ascending whether to put in ascending order
-   * @param order whether to order
-   * @param maxParts maximum number of parts to return, or -1 for all
-   * @return struct with all of the partition value information
-   * @throws MetaException error access the RDBMS
-   */
-  PartitionValuesResponse listPartitionValues(String catName, String db_name, String tbl_name,
-                                              List<FieldSchema> cols, boolean applyDistinct, String filter, boolean ascending,
-                                              List<FieldSchema> order, long maxParts) throws MetaException;
-
-  /**
-   * Alter a partition.
-   * @param catName catalog name.
-   * @param db_name database name.
-   * @param tbl_name table name.
-   * @param part_vals partition values that describe the partition.
-   * @param new_part new partition object.  This should be a complete copy of the old with
-   *                 changes values, not just the parts to update.
-   * @throws InvalidObjectException No such partition.
-   * @throws MetaException error accessing the RDBMS.
-   */
-  void alterPartition(String catName, String db_name, String tbl_name, List<String> part_vals,
-      Partition new_part) throws InvalidObjectException, MetaException;
-
-  /**
-   * Alter a set of partitions.
-   * @param catName catalog name.
-   * @param db_name database name.
-   * @param tbl_name table name.
-   * @param part_vals_list list of list of partition values.  Each outer list describes one
-   *                       partition (with its list of partition values).
-   * @param new_parts list of new partitions.  The order must match the old partitions described in
-   *                  part_vals_list.  Each of these should be a complete copy of the new
-   *                  partition, not just the pieces to update.
-   * @throws InvalidObjectException One of the indicated partitions does not exist.
-   * @throws MetaException error accessing the RDBMS.
-   */
-  void alterPartitions(String catName, String db_name, String tbl_name,
-      List<List<String>> part_vals_list, List<Partition> new_parts)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Get partitions with a filter.  This is a portion of the SQL where clause.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tblName table name
-   * @param filter SQL where clause filter
-   * @param maxParts maximum number of partitions to return, or -1 for all.
-   * @return list of partition objects matching the criteria
-   * @throws MetaException Error accessing the RDBMS or processing the filter.
-   * @throws NoSuchObjectException no such table.
-   */
-  List<Partition> getPartitionsByFilter(
-      String catName, String dbName, String tblName, String filter, short maxParts)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get partitions using an already parsed expression.
-   * @param catName catalog name.
-   * @param dbName database name
-   * @param tblName table name
-   * @param expr an already parsed Hive expression
-   * @param defaultPartitionName default name of a partition
-   * @param maxParts maximum number of partitions to return, or -1 for all
-   * @param result list to place resulting partitions in
-   * @return true if the result contains unknown partitions.
-   * @throws TException error executing the expression
-   */
-  boolean getPartitionsByExpr(String catName, String dbName, String tblName,
-      byte[] expr, String defaultPartitionName, short maxParts, List<Partition> result)
-      throws TException;
-
-  /**
-   * Get the number of partitions that match a provided SQL filter.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param filter filter from Hive's SQL where clause
-   * @return number of matching partitions.
-   * @throws MetaException error accessing the RDBMS or executing the filter
-   * @throws NoSuchObjectException no such table
-   */
-  int getNumPartitionsByFilter(String catName, String dbName, String tblName, String filter)
-    throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get the number of partitions that match an already parsed expression.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param expr an already parsed Hive expression
-   * @return number of matching partitions.
-   * @throws MetaException error accessing the RDBMS or working with the expression.
-   * @throws NoSuchObjectException no such table.
-   */
-  int getNumPartitionsByExpr(String catName, String dbName, String tblName, byte[] expr)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get partitions by name.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param partNames list of partition names.  These are names not values, so they will include
-   *                  both the key and the value.
-   * @return list of matching partitions
-   * @throws MetaException error accessing the RDBMS.
-   * @throws NoSuchObjectException No such table.
-   */
-  List<Partition> getPartitionsByNames(String catName, String dbName, String tblName,
-                                       List<String> partNames)
-      throws MetaException, NoSuchObjectException;
-
-  Table markPartitionForEvent(String catName, String dbName, String tblName, Map<String,String> partVals, PartitionEventType evtType) throws MetaException, UnknownTableException, InvalidPartitionException, UnknownPartitionException;
-
-  boolean isPartitionMarkedForEvent(String catName, String dbName, String tblName, Map<String, String> partName, PartitionEventType evtType) throws MetaException, UnknownTableException, InvalidPartitionException, UnknownPartitionException;
-
-  boolean addRole(String rowName, String ownerName)
-      throws InvalidObjectException, MetaException, NoSuchObjectException;
-
-  boolean removeRole(String roleName) throws MetaException, NoSuchObjectException;
-
-  boolean grantRole(Role role, String userName, PrincipalType principalType,
-      String grantor, PrincipalType grantorType, boolean grantOption)
-      throws MetaException, NoSuchObjectException, InvalidObjectException;
-
-  boolean revokeRole(Role role, String userName, PrincipalType principalType,
-      boolean grantOption) throws MetaException, NoSuchObjectException;
-
-  PrincipalPrivilegeSet getUserPrivilegeSet(String userName,
-      List<String> groupNames) throws InvalidObjectException, MetaException;
-
-  /**
-   * Get privileges for a database for a user.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param userName user name
-   * @param groupNames list of groups the user is in
-   * @return privileges for that user on indicated database
-   * @throws InvalidObjectException no such database
-   * @throws MetaException error accessing the RDBMS
-   */
-  PrincipalPrivilegeSet getDBPrivilegeSet (String catName, String dbName, String userName,
-      List<String> groupNames)  throws InvalidObjectException, MetaException;
-
-  /**
-   * Get privileges for a table for a user.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param userName user name
-   * @param groupNames list of groups the user is in
-   * @return privileges for that user on indicated table
-   * @throws InvalidObjectException no such table
-   * @throws MetaException error accessing the RDBMS
-   */
-  PrincipalPrivilegeSet getTablePrivilegeSet (String catName, String dbName, String tableName,
-      String userName, List<String> groupNames) throws InvalidObjectException, MetaException;
-
-  /**
-   * Get privileges for a partition for a user.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param partition partition name
-   * @param userName user name
-   * @param groupNames list of groups the user is in
-   * @return privileges for that user on indicated partition
-   * @throws InvalidObjectException no such partition
-   * @throws MetaException error accessing the RDBMS
-   */
-  PrincipalPrivilegeSet getPartitionPrivilegeSet (String catName, String dbName, String tableName,
-      String partition, String userName, List<String> groupNames) throws InvalidObjectException, MetaException;
-
-  /**
-   * Get privileges for a column in a table or partition for a user.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param partitionName partition name, or null for table level column permissions
-   * @param columnName column name
-   * @param userName user name
-   * @param groupNames list of groups the user is in
-   * @return privileges for that user on indicated column in the table or partition
-   * @throws InvalidObjectException no such table, partition, or column
-   * @throws MetaException error accessing the RDBMS
-   */
-  PrincipalPrivilegeSet getColumnPrivilegeSet (String catName, String dbName, String tableName, String partitionName,
-      String columnName, String userName, List<String> groupNames) throws InvalidObjectException, MetaException;
-
-  List<HiveObjectPrivilege> listPrincipalGlobalGrants(String principalName,
-      PrincipalType principalType);
-
-  /**
-   * For a given principal name and type, list the DB Grants
-   * @param principalName principal name
-   * @param principalType type
-   * @param catName catalog name
-   * @param dbName database name
-   * @return list of privileges for that principal on the specified database.
-   */
-  List<HiveObjectPrivilege> listPrincipalDBGrants(String principalName,
-      PrincipalType principalType, String catName, String dbName);
-
-  /**
-   * For a given principal name and type, list the Table Grants
-   * @param principalName principal name
-   * @param principalType type
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @return list of privileges for that principal on the specified database.
-   */
-  List<HiveObjectPrivilege> listAllTableGrants(
-      String principalName, PrincipalType principalType, String catName, String dbName,
-      String tableName);
-
-  /**
-   * For a given principal name and type, list the Table Grants
-   * @param principalName principal name
-   * @param principalType type
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param partName partition name (not value)
-   * @return list of privileges for that principal on the specified database.
-   */
-  List<HiveObjectPrivilege> listPrincipalPartitionGrants(
-      String principalName, PrincipalType principalType, String catName, String dbName,
-      String tableName, List<String> partValues, String partName);
-
-  /**
-   * For a given principal name and type, list the Table Grants
-   * @param principalName principal name
-   * @param principalType type
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param columnName column name
-   * @return list of privileges for that principal on the specified database.
-   */
-  List<HiveObjectPrivilege> listPrincipalTableColumnGrants(
-      String principalName, PrincipalType principalType, String catName, String dbName,
-      String tableName, String columnName);
-
-  /**
-   * For a given principal name and type, list the Table Grants
-   * @param principalName principal name
-   * @param principalType type
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param partName partition name (not value)
-   * @param columnName column name
-   * @return list of privileges for that principal on the specified database.
-   */
-  List<HiveObjectPrivilege> listPrincipalPartitionColumnGrants(
-      String principalName, PrincipalType principalType, String catName, String dbName,
-      String tableName, List<String> partValues, String partName, String columnName);
-
-  boolean grantPrivileges (PrivilegeBag privileges)
-      throws InvalidObjectException, MetaException, NoSuchObjectException;
-
-  boolean revokePrivileges(PrivilegeBag privileges, boolean grantOption)
-  throws InvalidObjectException, MetaException, NoSuchObjectException;
-
-  boolean refreshPrivileges(HiveObjectRef objToRefresh, String authorizer, PrivilegeBag grantPrivileges)
-  throws InvalidObjectException, MetaException, NoSuchObjectException;
-
-  org.apache.hadoop.hive.metastore.api.Role getRole(
-      String roleName) throws NoSuchObjectException;
-
-  List<String> listRoleNames();
-
-  List<Role> listRoles(String principalName,
-      PrincipalType principalType);
-
-  List<RolePrincipalGrant> listRolesWithGrants(String principalName,
-                                                      PrincipalType principalType);
-
-
-  /**
-   * Get the role to principal grant mapping for given role
-   * @param roleName
-   * @return
-   */
-  List<RolePrincipalGrant> listRoleMembers(String roleName);
-
-
-  /**
-   * Fetch a partition along with privilege information for a particular user.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param partVals partition values
-   * @param user_name user to get privilege information for.
-   * @param group_names groups to get privilege information for.
-   * @return a partition
-   * @throws MetaException error accessing the RDBMS.
-   * @throws NoSuchObjectException no such partition exists
-   * @throws InvalidObjectException error fetching privilege information
-   */
-  Partition getPartitionWithAuth(String catName, String dbName, String tblName,
-      List<String> partVals, String user_name, List<String> group_names)
-      throws MetaException, NoSuchObjectException, InvalidObjectException;
-
-  /**
-   * Fetch some or all partitions for a table, along with privilege information for a particular
-   * user.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param maxParts maximum number of partitions to fetch, -1 for all partitions.
-   * @param userName user to get privilege information for.
-   * @param groupNames groups to get privilege information for.
-   * @return list of partitions.
-   * @throws MetaException error access the RDBMS.
-   * @throws NoSuchObjectException no such table exists
-   * @throws InvalidObjectException error fetching privilege information.
-   */
-  List<Partition> getPartitionsWithAuth(String catName, String dbName,
-      String tblName, short maxParts, String userName, List<String> groupNames)
-      throws MetaException, NoSuchObjectException, InvalidObjectException;
-
-  /**
-   * Lists partition names that match a given partial specification
-   * @param catName catalog name.
-   * @param db_name
-   *          The name of the database which has the partitions
-   * @param tbl_name
-   *          The name of the table which has the partitions
-   * @param part_vals
-   *          A partial list of values for partitions in order of the table's partition keys.
-   *          Entries can be empty if you only want to specify latter partitions.
-   * @param max_parts
-   *          The maximum number of partitions to return
-   * @return A list of partition names that match the partial spec.
-   * @throws MetaException error accessing RDBMS
-   * @throws NoSuchObjectException No such table exists
-   */
-  List<String> listPartitionNamesPs(String catName, String db_name, String tbl_name,
-      List<String> part_vals, short max_parts)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * Lists partitions that match a given partial specification and sets their auth privileges.
-   *   If userName and groupNames null, then no auth privileges are set.
-   * @param catName catalog name.
-   * @param db_name
-   *          The name of the database which has the partitions
-   * @param tbl_name
-   *          The name of the table which has the partitions
-   * @param part_vals
-   *          A partial list of values for partitions in order of the table's partition keys
-   *          Entries can be empty if you need to specify latter partitions.
-   * @param max_parts
-   *          The maximum number of partitions to return
-   * @param userName
-   *          The user name for the partition for authentication privileges
-   * @param groupNames
-   *          The groupNames for the partition for authentication privileges
-   * @return A list of partitions that match the partial spec.
-   * @throws MetaException error access RDBMS
-   * @throws NoSuchObjectException No such table exists
-   * @throws InvalidObjectException error access privilege information
-   */
-  List<Partition> listPartitionsPsWithAuth(String catName, String db_name, String tbl_name,
-      List<String> part_vals, short max_parts, String userName, List<String> groupNames)
-      throws MetaException, InvalidObjectException, NoSuchObjectException;
-
-  /** Persists the given column statistics object to the metastore
-   * @param colStats object to persist
-   * @return Boolean indicating the outcome of the operation
-   * @throws NoSuchObjectException No such table.
-   * @throws MetaException error accessing the RDBMS.
-   * @throws InvalidObjectException the stats object is invalid
-   * @throws InvalidInputException unable to record the stats for the table
-   */
-  boolean updateTableColumnStatistics(ColumnStatistics colStats)
-      throws NoSuchObjectException, MetaException, InvalidObjectException, InvalidInputException;
-
-  /** Persists the given column statistics object to the metastore
-   * @param statsObj object to persist
-   * @param partVals partition values to persist the stats for
-   * @return Boolean indicating the outcome of the operation
-   * @throws NoSuchObjectException No such table.
-   * @throws MetaException error accessing the RDBMS.
-   * @throws InvalidObjectException the stats object is invalid
-   * @throws InvalidInputException unable to record the stats for the table
-   */
-  boolean updatePartitionColumnStatistics(ColumnStatistics statsObj,
-     List<String> partVals)
-     throws NoSuchObjectException, MetaException, InvalidObjectException, InvalidInputException;
-
-  /**
-   * Returns the relevant column statistics for a given column in a given table in a given database
-   * if such statistics exist.
-   * @param catName catalog name.
-   * @param dbName name of the database, defaults to current database
-   * @param tableName name of the table
-   * @param colName names of the columns for which statistics is requested
-   * @return Relevant column statistics for the column for the given table
-   * @throws NoSuchObjectException No such table
-   * @throws MetaException error accessing the RDBMS
-   *
-   */
-  ColumnStatistics getTableColumnStatistics(String catName, String dbName, String tableName,
-    List<String> colName) throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get statistics for a partition for a set of columns.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param partNames list of partition names.  These are names so must be key1=val1[/key2=val2...]
-   * @param colNames list of columns to get stats for
-   * @return list of statistics objects
-   * @throws MetaException error accessing the RDBMS
-   * @throws NoSuchObjectException no such partition.
-   */
-  List<ColumnStatistics> getPartitionColumnStatistics(
-     String catName, String dbName, String tblName, List<String> partNames, List<String> colNames)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * Deletes column statistics if present associated with a given db, table, partition and col. If
-   * null is passed instead of a colName, stats when present for all columns associated
-   * with a given db, table and partition are deleted.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tableName table name.
-   * @param partName partition name.
-   * @param partVals partition values.
-   * @param colName column name.
-   * @return Boolean indicating the outcome of the operation
-   * @throws NoSuchObjectException no such partition
-   * @throws MetaException error access the RDBMS
-   * @throws InvalidObjectException error dropping the stats
-   * @throws InvalidInputException bad input, such as null table or database name.
-   */
-  boolean deletePartitionColumnStatistics(String catName, String dbName, String tableName,
-      String partName, List<String> partVals, String colName)
-      throws NoSuchObjectException, MetaException, InvalidObjectException, InvalidInputException;
-
-  /**
-   * Delete statistics for a single column or all columns in a table.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param colName column name.  Null to delete stats for all columns in the table.
-   * @return true if the statistics were deleted.
-   * @throws NoSuchObjectException no such table or column.
-   * @throws MetaException error access the RDBMS.
-   * @throws InvalidObjectException error dropping the stats
-   * @throws InvalidInputException bad inputs, such as null table name.
-   */
-  boolean deleteTableColumnStatistics(String catName, String dbName, String tableName,
-                                      String colName)
-    throws NoSuchObjectException, MetaException, InvalidObjectException, InvalidInputException;
-
-  long cleanupEvents();
-
-  boolean addToken(String tokenIdentifier, String delegationToken);
-
-  boolean removeToken(String tokenIdentifier);
-
-  String getToken(String tokenIdentifier);
-
-  List<String> getAllTokenIdentifiers();
-
-  int addMasterKey(String key) throws MetaException;
-
-  void updateMasterKey(Integer seqNo, String key)
-     throws NoSuchObjectException, MetaException;
-
-  boolean removeMasterKey(Integer keySeq);
-
-  String[] getMasterKeys();
-
-  void verifySchema() throws MetaException;
-
-  String getMetaStoreSchemaVersion() throws  MetaException;
-
-  abstract void setMetaStoreSchemaVersion(String version, String comment) throws MetaException;
-
-  /**
-   * Drop a list of partitions.
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name
-   * @param partNames list of partition names.
-   * @throws MetaException error access RDBMS or storage.
-   * @throws NoSuchObjectException One or more of the partitions does not exist.
-   */
-  void dropPartitions(String catName, String dbName, String tblName, List<String> partNames)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * List all DB grants for a given principal.
-   * @param principalName principal name
-   * @param principalType type
-   * @return all DB grants for this principal
-   */
-  List<HiveObjectPrivilege> listPrincipalDBGrantsAll(
-      String principalName, PrincipalType principalType);
-
-  /**
-   * List all Table grants for a given principal
-   * @param principalName principal name
-   * @param principalType type
-   * @return all Table grants for this principal
-   */
-  List<HiveObjectPrivilege> listPrincipalTableGrantsAll(
-      String principalName, PrincipalType principalType);
-
-  /**
-   * List all Partition grants for a given principal
-   * @param principalName principal name
-   * @param principalType type
-   * @return all Partition grants for this principal
-   */
-  List<HiveObjectPrivilege> listPrincipalPartitionGrantsAll(
-      String principalName, PrincipalType principalType);
-
-  /**
-   * List all Table column grants for a given principal
-   * @param principalName principal name
-   * @param principalType type
-   * @return all Table column grants for this principal
-   */
-  List<HiveObjectPrivilege> listPrincipalTableColumnGrantsAll(
-      String principalName, PrincipalType principalType);
-
-  /**
-   * List all Partition column grants for a given principal
-   * @param principalName principal name
-   * @param principalType type
-   * @return all Partition column grants for this principal
-   */
-  List<HiveObjectPrivilege> listPrincipalPartitionColumnGrantsAll(
-      String principalName, PrincipalType principalType);
-
-  List<HiveObjectPrivilege> listGlobalGrantsAll();
-
-  /**
-   * Find all the privileges for a given database.
-   * @param catName catalog name
-   * @param dbName database name
-   * @return list of all privileges.
-   */
-  List<HiveObjectPrivilege> listDBGrantsAll(String catName, String dbName);
-
-  /**
-   * Find all of the privileges for a given column in a given partition.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param partitionName partition name (not value)
-   * @param columnName column name
-   * @return all privileges on this column in this partition
-   */
-  List<HiveObjectPrivilege> listPartitionColumnGrantsAll(
-      String catName, String dbName, String tableName, String partitionName, String columnName);
-
-  /**
-   * Find all of the privileges for a given table
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @return all privileges on this table
-   */
-  List<HiveObjectPrivilege> listTableGrantsAll(String catName, String dbName, String tableName);
-
-  /**
-   * Find all of the privileges for a given partition.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param partitionName partition name (not value)
-   * @return all privileges on this partition
-   */
-  List<HiveObjectPrivilege> listPartitionGrantsAll(
-      String catName, String dbName, String tableName, String partitionName);
-
-  /**
-   * Find all of the privileges for a given column in a given table.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param columnName column name
-   * @return all privileges on this column in this table
-   */
-  List<HiveObjectPrivilege> listTableColumnGrantsAll(
-      String catName, String dbName, String tableName, String columnName);
-
-  /**
-   * Register a user-defined function based on the function specification passed in.
-   * @param func function to create
-   * @throws InvalidObjectException incorrectly specified function
-   * @throws MetaException error accessing the RDBMS
-   */
-  void createFunction(Function func)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Alter function based on new function specs.
-   * @param dbName database name
-   * @param funcName function name
-   * @param newFunction new function specification
-   * @throws InvalidObjectException no such function, or incorrectly specified new function
-   * @throws MetaException incorrectly specified function
-   */
-  void alterFunction(String catName, String dbName, String funcName, Function newFunction)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Drop a function definition.
-   * @param dbName database name
-   * @param funcName function name
-   * @throws MetaException incorrectly specified function
-   * @throws NoSuchObjectException no such function
-   * @throws InvalidObjectException not sure when this is thrown
-   * @throws InvalidInputException not sure when this is thrown
-   */
-  void dropFunction(String catName, String dbName, String funcName)
-      throws MetaException, NoSuchObjectException, InvalidObjectException, InvalidInputException;
-
-  /**
-   * Retrieve function by name.
-   * @param dbName database name
-   * @param funcName function name
-   * @return the function
-   * @throws MetaException incorrectly specified function
-   */
-  Function getFunction(String catName, String dbName, String funcName) throws MetaException;
-
-  /**
-   * Retrieve all functions.
-   * @return all functions in a catalog
-   * @throws MetaException incorrectly specified function
-   */
-  List<Function> getAllFunctions(String catName) throws MetaException;
-
-  /**
-   * Retrieve list of function names based on name pattern.
-   * @param dbName database name
-   * @param pattern pattern to match
-   * @return functions that match the pattern
-   * @throws MetaException incorrectly specified function
-   */
-  List<String> getFunctions(String catName, String dbName, String pattern) throws MetaException;
-
-  /**
-   * Get aggregated stats for a table or partition(s).
-   * @param catName catalog name.
-   * @param dbName database name.
-   * @param tblName table name.
-   * @param partNames list of partition names.  These are the names of the partitions, not
-   *                  values.
-   * @param colNames list of column names
-   * @return aggregated stats
-   * @throws MetaException error accessing RDBMS
-   * @throws NoSuchObjectException no such table or partition
-   */
-  AggrStats get_aggr_stats_for(String catName, String dbName, String tblName,
-    List<String> partNames, List<String> colNames) throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get column stats for all partitions of all tables in the database
-   * @param catName catalog name
-   * @param dbName database name
-   * @return List of column stats objects for all partitions of all tables in the database
-   * @throws MetaException error accessing RDBMS
-   * @throws NoSuchObjectException no such database
-   */
-  List<ColStatsObjWithSourceInfo> getPartitionColStatsForDatabase(String catName, String dbName)
-      throws MetaException, NoSuchObjectException;
-
-  /**
-   * Get the next notification event.
-   * @param rqst Request containing information on the last processed notification.
-   * @return list of notifications, sorted by eventId
-   */
-  NotificationEventResponse getNextNotification(NotificationEventRequest rqst);
-
-
-  /**
-   * Add a notification entry.  This should only be called from inside the metastore
-   * @param event the notification to add
-   * @throws MetaException error accessing RDBMS
-   */
-  void addNotificationEvent(NotificationEvent event) throws MetaException;
-
-  /**
-   * Remove older notification events.
-   * @param olderThan Remove any events older than a given number of seconds
-   */
-  void cleanNotificationEvents(int olderThan);
-
-  /**
-   * Get the last issued notification event id.  This is intended for use by the export command
-   * so that users can determine the state of the system at the point of the export,
-   * and determine which notification events happened before or after the export.
-   * @return
-   */
-  CurrentNotificationEventId getCurrentNotificationEventId();
-
-  /**
-   * Get the number of events corresponding to given database with fromEventId.
-   * This is intended for use by the repl commands to track the progress of incremental dump.
-   * @return
-   */
-  NotificationEventsCountResponse getNotificationEventsCount(NotificationEventsCountRequest rqst);
-
-  /*
-   * Flush any catalog objects held by the metastore implementation.  Note that this does not
-   * flush statistics objects.  This should be called at the beginning of each query.
-   */
-  void flushCache();
-
-  /**
-   * @param fileIds List of file IDs from the filesystem.
-   * @return File metadata buffers from file metadata cache. The array is fileIds-sized, and
-   *         the entries (or nulls, if metadata is not in cache) correspond to fileIds in the list
-   */
-  ByteBuffer[] getFileMetadata(List<Long> fileIds) throws MetaException;
-
-  /**
-   * @param fileIds List of file IDs from the filesystem.
-   * @param metadata Metadata buffers corresponding to fileIds in the list.
-   * @param type The type; determines the class that can do additiona processing for metadata.
-   */
-  void putFileMetadata(List<Long> fileIds, List<ByteBuffer> metadata,
-      FileMetadataExprType type) throws MetaException;
-
-  /**
-   * @return Whether file metadata cache is supported by this implementation.
-   */
-  boolean isFileMetadataSupported();
-
-  /**
-   * Gets file metadata from cache after applying a format-specific expression that can
-   * produce additional information based on file metadata and also filter the file list.
-   * @param fileIds List of file IDs from the filesystem.
-   * @param expr Format-specific serialized expression applicable to the files' metadatas.
-   * @param type Expression type; used to determine the class that handles the metadata.
-   * @param metadatas Output parameter; fileIds-sized array to receive the metadatas
-   *                  for corresponding files, if any.
-   * @param exprResults Output parameter; fileIds-sized array to receive the format-specific
-   *                    expression results for the corresponding files.
-   * @param eliminated Output parameter; fileIds-sized array to receive the indication of whether
-   *                   the corresponding files are entirely eliminated by the expression.
-   */
-  void getFileMetadataByExpr(List<Long> fileIds, FileMetadataExprType type, byte[] expr,
-      ByteBuffer[] metadatas, ByteBuffer[] exprResults, boolean[] eliminated)
-          throws MetaException;
-
-  /** Gets file metadata handler for the corresponding type. */
-  FileMetadataHandler getFileMetadataHandler(FileMetadataExprType type);
-
-  /**
-   * Gets total number of tables.
-   */
-  @InterfaceStability.Evolving
-  int getTableCount() throws MetaException;
-
-  /**
-   * Gets total number of partitions.
-   */
-  @InterfaceStability.Evolving
-  int getPartitionCount() throws MetaException;
-
-  /**
-   * Gets total number of databases.
-   */
-  @InterfaceStability.Evolving
-  int getDatabaseCount() throws MetaException;
-
-  /**
-   * Get the primary associated with a table.  Strangely enough each SQLPrimaryKey is actually a
-   * column in they key, not the key itself.  Thus the list.
-   * @param catName catalog name
-   * @param db_name database name
-   * @param tbl_name table name
-   * @return list of primary key columns or an empty list if the table does not have a primary key
-   * @throws MetaException error accessing the RDBMS
-   */
-  List<SQLPrimaryKey> getPrimaryKeys(String catName, String db_name, String tbl_name)
-      throws MetaException;
-
-  /**
-   * Get the foreign keys for a table.  All foreign keys for a particular table can be fetched by
-   * passing null for the last two arguments.
-   * @param catName catalog name.
-   * @param parent_db_name Database the table referred to is in.  This can be null to match all
-   *                       databases.
-   * @param parent_tbl_name Table that is referred to.  This can be null to match all tables.
-   * @param foreign_db_name Database the table with the foreign key is in.
-   * @param foreign_tbl_name Table with the foreign key.
-   * @return List of all matching foreign key columns.  Note that if more than one foreign key
-   * matches the arguments the results here will be all mixed together into a single list.
-   * @throws MetaException error access the RDBMS.
-   */
-  List<SQLForeignKey> getForeignKeys(String catName, String parent_db_name,
-    String parent_tbl_name, String foreign_db_name, String foreign_tbl_name)
-    throws MetaException;
-
-  /**
-   * Get unique constraints associated with a table.
-   * @param catName catalog name.
-   * @param db_name database name.
-   * @param tbl_name table name.
-   * @return list of unique constraints
-   * @throws MetaException error access the RDBMS.
-   */
-  List<SQLUniqueConstraint> getUniqueConstraints(String catName, String db_name,
-    String tbl_name) throws MetaException;
-
-  /**
-   * Get not null constraints on a table.
-   * @param catName catalog name.
-   * @param db_name database name.
-   * @param tbl_name table name.
-   * @return list of not null constraints
-   * @throws MetaException error accessing the RDBMS.
-   */
-  List<SQLNotNullConstraint> getNotNullConstraints(String catName, String db_name,
-    String tbl_name) throws MetaException;
-
-  /**
-   * Get default values for columns in a table.
-   * @param catName catalog name
-   * @param db_name database name
-   * @param tbl_name table name
-   * @return list of default values defined on the table.
-   * @throws MetaException error accessing the RDBMS
-   */
-  List<SQLDefaultConstraint> getDefaultConstraints(String catName, String db_name,
-                                                   String tbl_name) throws MetaException;
-
-  /**
-   * Get check constraints for columns in a table.
-   * @param catName catalog name.
-   * @param db_name database name
-   * @param tbl_name table name
-   * @return ccheck constraints for this table
-   * @throws MetaException error accessing the RDBMS
-   */
-  List<SQLCheckConstraint> getCheckConstraints(String catName, String db_name,
-                                                   String tbl_name) throws MetaException;
-
-  /**
-   * Create a table with constraints
-   * @param tbl table definition
-   * @param primaryKeys primary key definition, or null
-   * @param foreignKeys foreign key definition, or null
-   * @param uniqueConstraints unique constraints definition, or null
-   * @param notNullConstraints not null constraints definition, or null
-   * @param defaultConstraints default values definition, or null
-   * @return list of constraint names
-   * @throws InvalidObjectException one of the provided objects is malformed.
-   * @throws MetaException error accessing the RDBMS
-   */
-  List<String> createTableWithConstraints(Table tbl, List<SQLPrimaryKey> primaryKeys,
-    List<SQLForeignKey> foreignKeys, List<SQLUniqueConstraint> uniqueConstraints,
-    List<SQLNotNullConstraint> notNullConstraints,
-    List<SQLDefaultConstraint> defaultConstraints,
-    List<SQLCheckConstraint> checkConstraints) throws InvalidObjectException, MetaException;
-
-  /**
-   * Drop a constraint, any constraint.  I have no idea why add and get each have separate
-   * methods for each constraint type but drop has only one.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param constraintName name of the constraint
-   * @throws NoSuchObjectException no constraint of this name exists
-   */
-  default void dropConstraint(String catName, String dbName, String tableName,
-                              String constraintName) throws NoSuchObjectException {
-    dropConstraint(catName, dbName, tableName, constraintName, false);
-  }
-
-  /**
-   * Drop a constraint, any constraint.  I have no idea why add and get each have separate
-   * methods for each constraint type but drop has only one.
-   * @param catName catalog name
-   * @param dbName database name
-   * @param tableName table name
-   * @param constraintName name of the constraint
-   * @param missingOk if true, it is not an error if there is no constraint of this name.  If
-   *                  false and there is no constraint of this name an exception will be thrown.
-   * @throws NoSuchObjectException no constraint of this name exists and missingOk = false
-   */
-  void dropConstraint(String catName, String dbName, String tableName, String constraintName,
-                      boolean missingOk) throws NoSuchObjectException;
-
-  /**
-   * Add a primary key to a table.
-   * @param pks Columns in the primary key.
-   * @return the name of the constraint, as a list of strings.
-   * @throws InvalidObjectException The SQLPrimaryKeys list is malformed
-   * @throws MetaException error accessing the RDMBS
-   */
-  List<String> addPrimaryKeys(List<SQLPrimaryKey> pks) throws InvalidObjectException, MetaException;
-
-  /**
-   * Add a foreign key to a table.
-   * @param fks foreign key specification
-   * @return foreign key name.
-   * @throws InvalidObjectException the specification is malformed.
-   * @throws MetaException error accessing the RDBMS.
-   */
-  List<String> addForeignKeys(List<SQLForeignKey> fks) throws InvalidObjectException, MetaException;
-
-  /**
-   * Add unique constraints to a table.
-   * @param uks unique constraints specification
-   * @return unique constraint names.
-   * @throws InvalidObjectException the specification is malformed.
-   * @throws MetaException error accessing the RDBMS.
-   */
-  List<String> addUniqueConstraints(List<SQLUniqueConstraint> uks) throws InvalidObjectException, MetaException;
-
-  /**
-   * Add not null constraints to a table.
-   * @param nns not null constraint specifications
-   * @return constraint names.
-   * @throws InvalidObjectException the specification is malformed.
-   * @throws MetaException error accessing the RDBMS.
-   */
-  List<String> addNotNullConstraints(List<SQLNotNullConstraint> nns) throws InvalidObjectException, MetaException;
-
-  /**
-   * Add default values to a table definition
-   * @param dv list of default values
-   * @return constraint names
-   * @throws InvalidObjectException the specification is malformed.
-   * @throws MetaException error accessing the RDBMS.
-   */
-  List<String> addDefaultConstraints(List<SQLDefaultConstraint> dv)
-      throws InvalidObjectException, MetaException;
-
-  /**
-   * Add check constraints to a table
-   * @param cc check constraints to add
-   * @return list of constraint names
-   * @throws InvalidObjectException the specification is malformed
-   * @throws MetaException error accessing the RDBMS
-   */
-  List<String> addCheckConstraints(List<SQLCheckConstraint> cc) throws InvalidObjectException, MetaException;
-
-  /**
-   * Gets the unique id of the backing datastore for the metadata
-   * @return
-   * @throws MetaException
-   */
-  String getMetastoreDbUuid() throws MetaException;
-
-  void createResourcePlan(WMResourcePlan resourcePlan, String copyFrom, int defaultPoolSize)
-      throws AlreadyExistsException, MetaException, InvalidObjectException, NoSuchObjectException;
-
-  WMFullResourcePlan getResourcePlan(String name) throws NoSuchObjectException, MetaException;
-
-  List<WMResourcePlan> getAllResourcePlans() throws MetaException;
-
-  WMFullResourcePlan alterResourcePlan(String name, WMNullableResourcePlan resourcePlan,
-      boolean canActivateDisabled, boolean canDeactivate, boolean isReplace)
-      throws AlreadyExistsException, NoSuchObjectException, InvalidOperationException,
-          MetaException;
-
-  WMFullResourcePlan getActiveResourcePlan() throws MetaException;
-
-  WMValidateResourcePlanResponse validateResourcePlan(String name)
-      throws NoSuchObjectException, InvalidObjectException, MetaException;
-
-  void dropResourcePlan(String name) throws NoSuchObjectException, MetaException;
-
-  void createWMTrigger(WMTrigger trigger)
-      throws AlreadyExistsException, NoSuchObjectException, InvalidOperationException,
-          MetaException;
-
-  void alterWMTrigger(WMTrigger trigger)
-      throws NoSuchObjectException, InvalidOperationException, MetaException;
-
-  void dropWMTrigger(String resourcePlanName, String triggerName)
-      throws NoSuchObjectException, InvalidOperationException, MetaException;
-
-  List<WMTrigger> getTriggersForResourcePlan(String resourcePlanName)
-      throws NoSuchObjectException, MetaException;
-
-  void createPool(WMPool pool) throws AlreadyExistsException, NoSuchObjectException,
-      InvalidOperationException, MetaException;
-
-  void alterPool(WMNullablePool pool, String poolPath) throws AlreadyExistsException,
-      NoSuchObjectException, InvalidOperationException, MetaException;
-
-  void dropWMPool(String resourcePlanName, String poolPath)
-      throws NoSuchObjectException, InvalidOperationException, MetaException;
-
-  void createOrUpdateWMMapping(WMMapping mapping, boolean update)
-      throws AlreadyExistsException, NoSuchObjectException, InvalidOperationException,
-          MetaException;
-
-  void dropWMMapping(WMMapping mapping)
-      throws NoSuchObjectException, InvalidOperationException, MetaException;
-
-  void createWMTriggerToPoolMapping(String resourcePlanName, String triggerName, String poolPath)
-      throws AlreadyExistsException, NoSuchObjectException, InvalidOperationException,
-          MetaException;
-
-  void dropWMTriggerToPoolMapping(String resourcePlanName, String triggerName, String poolPath)
-      throws NoSuchObjectException, InvalidOperationException, MetaException;
-
-  /**
-   * Create a new ISchema.
-   * @param schema schema to create
-   * @throws AlreadyExistsException there's already a schema with this name
-   * @throws MetaException general database exception
-   */
-  void createISchema(ISchema schema) throws AlreadyExistsException, MetaException,
-      NoSuchObjectException;
-
-  /**
-   * Alter an existing ISchema.  This assumes the caller has already checked that such a schema
-   * exists.
-   * @param schemaName name of the schema
-   * @param newSchema new schema object
-   * @throws NoSuchObjectException no function with this name exists
-   * @throws MetaException general database exception
-   */
-  void alterISchema(ISchemaName schemaName, ISchema newSchema) throws NoSuchObjectException, MetaException;
-
-  /**
-   * Get an ISchema by name.
-   * @param schemaName schema descriptor
-   * @return ISchema
-   * @throws MetaException general database exception
-   */
-  ISchema getISchema(ISchemaName schemaName) throws MetaException;
-
-  /**
-   * Drop an ISchema.  This does not check whether there are valid versions of the schema in
-   * existence, it assumes the caller has already done that.
-   * @param schemaName schema descriptor
-   * @throws NoSuchObjectException no schema of this name exists
-   * @throws MetaException general database exception
-   */
-  void dropISchema(ISchemaName schemaName) throws NoSuchObjectException, MetaException;
-
-  /**
-   * Create a new version of an existing schema.
-   * @param schemaVersion version number
-   * @throws AlreadyExistsException a version of the schema with the same version number already
-   * exists.
-   * @throws InvalidObjectException the passed in SchemaVersion object has problems.
-   * @throws NoSuchObjectException no schema with the passed in name exists.
-   * @throws MetaException general database exception
-   */
-  void addSchemaVersion(SchemaVersion schemaVersion)
-      throws AlreadyExistsException, InvalidObjectException, NoSuchObjectException, MetaException;
-
-  /**
-   * Alter a schema version.  Note that the Thrift interface only supports changing the serde
-   * mapping and states.  This method does not guarantee it will check anymore than that.  This
-   * method does not understand the state transitions and just assumes that the new state it is
-   * passed is reasonable.
-   * @param version version descriptor for the schema
-   * @param newVersion altered SchemaVersion
-   * @throws NoSuchObjectException no such version of the named schema exists
-   * @throws MetaException general database exception
-   */
-  void alterSchemaVersion(SchemaVersionDescriptor version, SchemaVersion newVersion)
-      throws NoSuchObjectException, MetaException;
-
-  /**
-   * Get a specific schema version.
-   * @param version version descriptor for the schema
-   * @return the SchemaVersion
-   * @throws MetaException general database exception
-   */
-  SchemaVersion getSchemaVersion(SchemaVersionDescriptor version) throws MetaException;
-
-  /**
-   * Get the latest version of a schema.
-   * @param schemaName name of the schema
-   * @return latest version of the schema
-   * @throws MetaException general database exception
-   */
-  SchemaVersion getLatestSchemaVersion(ISchemaName schemaName) throws MetaException;
-
-  /**
-   * Get all of the versions of a schema
-   * @param schemaName name of the schema
-   * @return all versions of the schema
-   * @throws MetaException general database exception
-   */
-  List<SchemaVersion> getAllSchemaVersion(ISchemaName schemaName) throws MetaException;
-
-  /**
-   * Find all SchemaVersion objects that match a query.  The query will select all SchemaVersions
-   * that are equal to all of the non-null passed in arguments.  That is, if arguments
-   * colName='name', colNamespace=null, type='string' are passed in, then all schemas that have
-   * a column with colName 'name' and type 'string' will be returned.
-   * @param colName column name.  Null is ok, which will cause this field to not be used in the
-   *                query.
-   * @param colNamespace column namespace.   Null is ok, which will cause this field to not be
-   *                     used in the query.
-   * @param type column type.   Null is ok, which will cause this field to not be used in the
-   *             query.
-   * @return List of all SchemaVersions that match.  Note that there is no expectation that these
-   * SchemaVersions derive from the same ISchema.  The list will be empty if there are no
-   * matching SchemaVersions.
-   * @throws MetaException general database exception
-   */
-  List<SchemaVersion> getSchemaVersionsByColumns(String colName, String colNamespace, String type)
-      throws MetaException;
-
-  /**
-   * Drop a version of the schema.
-   * @param version version descriptor for the schema
-   * @throws NoSuchObjectException no such version of the named schema exists
-   * @throws MetaException general database exception
-   */
-  void dropSchemaVersion(SchemaVersionDescriptor version) throws NoSuchObjectException, MetaException;
-
-  /**
-   * Get serde information
-   * @param serDeName name of the SerDe
-   * @return the SerDe, or null if there is no such serde
-   * @throws NoSuchObjectException no serde with this name exists
-   * @throws MetaException general database exception
-   */
-  SerDeInfo getSerDeInfo(String serDeName) throws NoSuchObjectException, MetaException;
-
-  /**
-   * Add a serde
-   * @param serde serde to add
-   * @throws AlreadyExistsException a serde of this name already exists
-   * @throws MetaException general database exception
-   */
-  void addSerde(SerDeInfo serde) throws AlreadyExistsException, MetaException;
-
-  /** Adds a RuntimeStat for persistence. */
-  void addRuntimeStat(RuntimeStat stat) throws MetaException;
-
-  /** Reads runtime statistic entries. */
-  List<RuntimeStat> getRuntimeStats(int maxEntries, int maxCreateTime) throws MetaException;
-
-  /** Removes outdated statistics. */
-  int deleteRuntimeStats(int maxRetainSecs) throws MetaException;
-
-  List<TableName> getTableNamesWithStats() throws MetaException, NoSuchObjectException;
-
-  List<TableName> getAllTableNamesForStats() throws MetaException, NoSuchObjectException;
-
-  Map<String, List<String>> getPartitionColsWithStats(String catName, String dbName,
-      String tableName) throws MetaException, NoSuchObjectException;
-
-  /**
-   * Remove older notification events.
-   * @param olderThan Remove any events older than a given number of seconds
-   */
-  void cleanWriteNotificationEvents(int olderThan);
-
-  /**
-   * Get all write events for a specific transaction .
-   * @param txnId get all the events done by this transaction
-   * @param dbName the name of db for which dump is being taken
-   * @param tableName the name of the table for which the dump is being taken
-   */
-  List<WriteEventInfo> getAllWriteEventInfo(long txnId, String dbName, String tableName) throws MetaException;
-}