AlterTableStmt.java

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// Copyright 2012 Cloudera Inc.
//
// Licensed 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 com.cloudera.impala.analysis;

import com.cloudera.impala.authorization.Privilege;
import com.cloudera.impala.catalog.DataSourceTable;
import com.cloudera.impala.catalog.Table;
import com.cloudera.impala.catalog.View;
import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TAlterTableParams;
import com.cloudera.impala.thrift.TTableName;
import com.google.common.base.Preconditions;

public abstract class AlterTableStmt extends StatementBase {
  protected final TableName tableName_;

  // Set during analysis.
  protected Table table_;

  protected AlterTableStmt(TableName tableName) {
    Preconditions.checkState(tableName != null && !tableName.isEmpty());
    tableName_ = tableName;
    table_ = null;
  }

  public String getTbl() { return tableName_.getTbl(); }

  public String getDb() {
    return getTargetTable().getDb().getName();
  }

  protected Table getTargetTable() {
    Preconditions.checkNotNull(table_);
    return table_;
  }

  public TAlterTableParams toThrift() {
    TAlterTableParams params = new TAlterTableParams();
    params.setTable_name(new TTableName(getDb(), getTbl()));
    return params;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    table_ = analyzer.getTable(tableName_, Privilege.ALTER);
    if (table_ instanceof View) {
      throw new AnalysisException(String.format(
          "ALTER TABLE not allowed on a view: %s", table_.getFullName()));
    }
    if (table_ instanceof DataSourceTable) {
      throw new AnalysisException(String.format(
          "ALTER TABLE not allowed on a table produced by a data source: %s",
          table_.getFullName()));
    }
  }
}