AlterTableSetCachedStmt.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.catalog.HdfsTable;
import com.cloudera.impala.catalog.Table;
import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TAlterTableParams;
import com.cloudera.impala.thrift.TAlterTableSetCachedParams;
import com.cloudera.impala.thrift.TAlterTableType;
import com.google.common.base.Preconditions;

public class AlterTableSetCachedStmt extends AlterTableSetStmt {
  private final HdfsCachingOp cacheOp_;

  public AlterTableSetCachedStmt(TableName tableName,
      PartitionSpec partitionSpec, HdfsCachingOp cacheOp) {
    super(tableName, partitionSpec);
    Preconditions.checkNotNull(cacheOp);
    cacheOp_ = cacheOp;
  }

  @Override
  public TAlterTableParams toThrift() {
    TAlterTableParams params = super.toThrift();
    params.setAlter_type(TAlterTableType.SET_CACHED);
    TAlterTableSetCachedParams cachingParams =
        new TAlterTableSetCachedParams();
    if (getPartitionSpec() != null) {
      cachingParams.setPartition_spec(getPartitionSpec().toThrift());
    }
    cachingParams.setCache_op(cacheOp_.toThrift());
    params.setSet_cached_params(cachingParams);
    return params;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    super.analyze(analyzer);
    cacheOp_.analyze(analyzer);

    Table table = getTargetTable();
    Preconditions.checkNotNull(table);
    if (!(table instanceof HdfsTable)) {
      throw new AnalysisException("ALTER TABLE SET [CACHED|UNCACHED] must target an " +
          "HDFS table: " + table.getFullName());
    }
  }
}