| // 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.impala.analysis; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.impala.authorization.Privilege; |
| import org.apache.impala.catalog.Column; |
| import org.apache.impala.catalog.FeTable; |
| import org.apache.impala.common.AnalysisException; |
| import org.apache.impala.thrift.TColumnName; |
| import org.apache.impala.thrift.TCommentOnParams; |
| |
| import java.util.List; |
| |
| /** |
| * Represents a COMMENT ON COLUMN table_or_view.col IS 'comment' statement. |
| */ |
| public class CommentOnColumnStmt extends CommentOnStmt { |
| private TableName tableName_; |
| private final String columnName_; |
| |
| public CommentOnColumnStmt(ColumnName columnName, String comment) { |
| super(comment); |
| Preconditions.checkNotNull(columnName); |
| this.tableName_ = columnName.getTableName(); |
| this.columnName_ = columnName.getColumnName(); |
| } |
| |
| @Override |
| public void collectTableRefs(List<TableRef> tblRefs) { |
| tblRefs.add(new TableRef(tableName_.toPath(), null)); |
| } |
| |
| @Override |
| public void analyze(Analyzer analyzer) throws AnalysisException { |
| super.analyze(analyzer); |
| tableName_ = analyzer.getFqTableName(tableName_); |
| // Although it makes sense to use column-level privilege, column-level privilege is |
| // only supported on tables and not views. |
| TableRef tableRef = new TableRef(tableName_.toPath(), null, Privilege.ALTER); |
| tableRef = analyzer.resolveTableRef(tableRef); |
| Preconditions.checkNotNull(tableRef); |
| tableRef.analyze(analyzer); |
| FeTable feTable; |
| String tableRefType = ""; |
| if (tableRef instanceof InlineViewRef) { |
| InlineViewRef inlineViewRef = (InlineViewRef) tableRef; |
| feTable = inlineViewRef.getView(); |
| tableRefType = "view"; |
| } else { |
| feTable = tableRef.getTable(); |
| tableRefType = "table"; |
| } |
| Column column = feTable.getColumn(columnName_); |
| if (column == null) { |
| throw new AnalysisException(String.format( |
| "Column '%s' does not exist in %s: %s", columnName_, tableRefType, tableName_)); |
| } |
| } |
| |
| @Override |
| public TCommentOnParams toThrift() { |
| TCommentOnParams params = super.toThrift(); |
| params.setColumn_name(new TColumnName(tableName_.toThrift(), columnName_)); |
| return params; |
| } |
| } |