[GitHub] [doris] morrySnow commented on a diff in pull request #13303: [enhancement](statistics) Support to drop table or partition statistics

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

morrySnow commented on code in PR #13303:
URL: https://github.com/apache/doris/pull/13303#discussion_r994316905


##########
fe/fe-core/src/main/java/org/apache/doris/analysis/DropTableStatsStmt.java:
##########
@@ -0,0 +1,140 @@
+// 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.doris.analysis;
+
+import org.apache.doris.catalog.Database;
+import org.apache.doris.catalog.Env;
+import org.apache.doris.catalog.Table;
+import org.apache.doris.common.AnalysisException;
+import org.apache.doris.common.ErrorCode;
+import org.apache.doris.common.ErrorReport;
+import org.apache.doris.common.UserException;
+import org.apache.doris.common.util.Util;
+import org.apache.doris.mysql.privilege.PaloAuth;
+import org.apache.doris.mysql.privilege.PrivPredicate;
+import org.apache.doris.qe.ConnectContext;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Manually drop statistics for tables or partitions.
+ * Table or partition can be specified, if neither is specified,
+ * all statistics under the current database will be deleted.
+ *
+ * syntax:
+ *     DROP STATS [TableName [PARTITIONS(partitionNames)]];
+ */
+public class DropTableStatsStmt extends DdlStmt {
+    private final TableName tableName;
+    private final PartitionNames optPartitionNames;
+
+    // after analyzed
+    private final Map<Long, Set<String>> tblIdToPartition = Maps.newHashMap();
+
+    public DropTableStatsStmt(TableName tableName, PartitionNames optPartitionNames) {
+        this.tableName = tableName;
+        this.optPartitionNames = optPartitionNames;
+    }
+
+    public Map<Long, Set<String>> getTblIdToPartition() {
+        Preconditions.checkArgument(isAnalyzed(),
+                "The partition name must be obtained after the parsing is complete");
+        return tblIdToPartition;
+    }
+
+    @Override
+    public void analyze(Analyzer analyzer) throws UserException {
+        super.analyze(analyzer);
+
+        if (tableName != null) {
+            if (Strings.isNullOrEmpty(tableName.getDb())) {
+                tableName.setDb(analyzer.getDefaultDb());
+            }
+
+            tableName.analyze(analyzer);
+
+            // check whether the deletion permission is granted
+            checkAnalyzePriv(tableName.getDb(), tableName.getTbl());
+
+            // disallow external catalog
+            Util.prohibitExternalCatalog(tableName.getCtl(), this.getClass().getSimpleName());
+
+            Database db = analyzer.getEnv().getInternalCatalog()
+                    .getDbOrAnalysisException(tableName.getDb());
+            long tableId = db.getTableOrAnalysisException(tableName.getTbl()).getId();
+
+            if (optPartitionNames == null) {
+                tblIdToPartition.put(tableId, null);
+            } else {
+                optPartitionNames.analyze(analyzer);
+                List<String> pNames = optPartitionNames.getPartitionNames();
+                HashSet<String> partitionNames = Sets.newHashSet(pNames);
+                tblIdToPartition.put(tableId, partitionNames);
+            }
+        } else {
+            Database db = analyzer.getEnv().getInternalCatalog()
+                    .getDbOrAnalysisException(analyzer.getDefaultDb());
+            for (Table table : db.getTables()) {
+                checkAnalyzePriv(db.getFullName(), table.getName());
+                tblIdToPartition.put(table.getId(), null);
+            }
+        }
+    }
+
+    private void checkAnalyzePriv(String dbName, String tblName) throws AnalysisException {
+        PaloAuth auth = Env.getCurrentEnv().getAuth();
+        if (!auth.checkTblPriv(ConnectContext.get(), dbName, tblName, PrivPredicate.DROP)) {
+            ErrorReport.reportAnalysisException(
+                    ErrorCode.ERR_TABLEACCESS_DENIED_ERROR,
+                    "DROP",
+                    ConnectContext.get().getQualifiedUser(),
+                    ConnectContext.get().getRemoteIP(),
+                    dbName + ": " + tblName);

Review Comment:
   dbName + "." + tblName is better?



##########
fe/fe-core/src/main/java/org/apache/doris/statistics/TableStats.java:
##########
@@ -78,7 +78,7 @@ public TableStats(double rowCount, long dataSize) {
     }
 
     public double getRowCount() {
-        if  (rowCount == -1) {
+        if  (rowCount == -1 && !nameToPartitionStats.isEmpty()) {

Review Comment:
   it is better add comment to record the reason



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