[GitHub] [drill] ihuzenko commented on a change in pull request #1940: DRILL-7406: Update Calcite to 1.21.0

[GitBox <gi...@apache.org>]

ihuzenko commented on a change in pull request #1940: DRILL-7406: Update Calcite to 1.21.0
URL: https://github.com/apache/drill/pull/1940#discussion_r361473590
 
 

 ##########
 File path: contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcCatalogSchema.java
 ##########
 @@ -0,0 +1,169 @@
+/*
+ * 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.drill.exec.store.jdbc;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.calcite.schema.Schema;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.calcite.schema.Table;
+import org.apache.calcite.sql.SqlDialect;
+import org.apache.drill.exec.store.AbstractSchema;
+import org.apache.drill.exec.store.SchemaFactory;
+
+class JdbcCatalogSchema extends AbstractSchema {
+
+  private final Map<String, CapitalizingJdbcSchema> schemaMap;
+  private final CapitalizingJdbcSchema defaultSchema;
+
+  JdbcCatalogSchema(String name, DataSource source, SqlDialect dialect, DrillJdbcConvention convention, boolean caseSensitive) {
+    super(Collections.emptyList(), name);
+    this.schemaMap = new HashMap<>();
+    String connectionSchemaName = null;
+    try (Connection con = source.getConnection();
+         ResultSet set = con.getMetaData().getCatalogs()) {
+      connectionSchemaName = con.getSchema();
+      while (set.next()) {
+        final String catalogName = set.getString(1);
+        CapitalizingJdbcSchema schema = new CapitalizingJdbcSchema(
+            getSchemaPath(), catalogName, source, dialect, convention, catalogName, null, caseSensitive);
+        schemaMap.put(schema.getName(), schema);
+      }
+    } catch (SQLException e) {
+      JdbcStoragePlugin.logger.warn("Failure while attempting to load JDBC schema.", e);
+    }
+
+    // unable to read catalog list.
+    if (schemaMap.isEmpty()) {
+
+      // try to add a list of schemas to the schema map.
+      boolean schemasAdded = addSchemas(source, dialect, convention, caseSensitive);
+
+      if (!schemasAdded) {
+        // there were no schemas, just create a default one (the jdbc system doesn't support catalogs/schemas).
+        schemaMap.put(SchemaFactory.DEFAULT_WS_NAME, new CapitalizingJdbcSchema(Collections.emptyList(), name, source, dialect, convention, null, null, caseSensitive));
+      }
+    } else {
+      // We already have catalogs. Add schemas in this context of their catalogs.
+      addSchemas(source, dialect, convention, caseSensitive);
+    }
+
+    defaultSchema = determineDefaultSchema(connectionSchemaName);
+  }
+
+  private CapitalizingJdbcSchema determineDefaultSchema(String connectionSchemaName) {
+    CapitalizingJdbcSchema connSchema;
+    if (connectionSchemaName == null ||
+        (connSchema = schemaMap.get(connectionSchemaName.toLowerCase())) == null) {
+      // todo: this selection of default schema isn't correct, users are getting implicit random schema as default
+      connSchema = schemaMap.values().iterator().next();
+    }
+    return (CapitalizingJdbcSchema) connSchema.getDefaultSchema();
+  }
+
+  void setHolder(SchemaPlus plusOfThis) {
+    for (String s : getSubSchemaNames()) {
+      CapitalizingJdbcSchema inner = getSubSchema(s);
+      SchemaPlus holder = plusOfThis.add(s, inner);
+      inner.setHolder(holder);
+    }
+  }
+
+  private boolean addSchemas(DataSource source, SqlDialect dialect, DrillJdbcConvention convention, boolean caseSensitive) {
+    boolean added = false;
+    try (Connection con = source.getConnection();
+         ResultSet set = con.getMetaData().getSchemas()) {
+      while (set.next()) {
+        final String schemaName = set.getString(1);
+        final String catalogName = set.getString(2);
+
+        String parentKey = catalogName == null ? null : catalogName.toLowerCase();
+        CapitalizingJdbcSchema parentSchema = schemaMap.get(parentKey);
+        if (parentSchema == null) {
+          CapitalizingJdbcSchema schema = new CapitalizingJdbcSchema(getSchemaPath(), schemaName, source, dialect,
+              convention, catalogName, schemaName, caseSensitive);
+
+          // if a catalog schema doesn't exist, we'll add this at the top level.
+          schemaMap.put(schema.getName(), schema);
+        } else {
+          CapitalizingJdbcSchema schema = new CapitalizingJdbcSchema(parentSchema.getSchemaPath(), schemaName,
+              source, dialect,
+              convention, catalogName, schemaName, caseSensitive);
+          parentSchema.schemaMap.put(schema.getName(), schema);
+        }
+        added = true;
+      }
+    } catch (SQLException e) {
+      JdbcStoragePlugin.logger.warn("Failure while attempting to load JDBC schema.", e);
+    }
+
+    return added;
+  }
+
+
+  @Override
+  public String getTypeName() {
+    return JdbcStorageConfig.NAME;
+  }
+
+  @Override
+  public Schema getDefaultSchema() {
+    return defaultSchema;
+  }
+
+  @Override
+  public CapitalizingJdbcSchema getSubSchema(String name) {
+    return schemaMap.get(name);
+  }
+
+  @Override
+  public Set<String> getSubSchemaNames() {
+    return schemaMap.keySet();
+  }
+
+  @Override
+  public Table getTable(String name) {
+    if (defaultSchema != null) {
+      try {
+        return defaultSchema.getTable(name);
+      } catch (RuntimeException e) {
 
 Review comment:
   Migrated code from ```JdbcStoragePlugin```. Since the method from ```try``` doesn't declare checked exceptions the ```catch``` is just enough.

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