org.apache.impala.catalog.HiveStorageDescriptorFactory.java Source code

Introduction

Here is the source code for org.apache.impala.catalog.HiveStorageDescriptorFactory.java

Source

// 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.catalog;

import java.util.HashMap;

import org.apache.hadoop.hive.metastore.api.StorageDescriptor;

import org.apache.impala.thrift.THdfsFileFormat;
import com.google.common.base.Preconditions;

public class HiveStorageDescriptorFactory {
    /**
     * Creates and returns a Hive StoreDescriptor for the given FileFormat and RowFormat.
     * Currently supports creating StorageDescriptors for Parquet, Text, Sequence, Avro and
     * RC file.
     * TODO: Add support for HBase
     */
    public static StorageDescriptor createSd(THdfsFileFormat fileFormat, RowFormat rowFormat) {
        Preconditions.checkNotNull(fileFormat);
        Preconditions.checkNotNull(rowFormat);

        StorageDescriptor sd = new StorageDescriptor();
        sd.setSerdeInfo(new org.apache.hadoop.hive.metastore.api.SerDeInfo());
        sd.getSerdeInfo().setParameters(new HashMap<String, String>());
        // The compressed flag is not used to determine whether the table is compressed or
        // not. Instead, we use the input format or the filename.
        sd.setCompressed(false);
        HdfsFileFormat hdfsFileFormat = HdfsFileFormat.fromThrift(fileFormat);
        sd.setInputFormat(hdfsFileFormat.inputFormat());
        sd.setOutputFormat(hdfsFileFormat.outputFormat());
        sd.getSerdeInfo().setSerializationLib(hdfsFileFormat.serializationLib());

        if (rowFormat.getFieldDelimiter() != null) {
            sd.getSerdeInfo().putToParameters("serialization.format", rowFormat.getFieldDelimiter());
            sd.getSerdeInfo().putToParameters("field.delim", rowFormat.getFieldDelimiter());
        }
        if (rowFormat.getEscapeChar() != null) {
            sd.getSerdeInfo().putToParameters("escape.delim", rowFormat.getEscapeChar());
        }
        if (rowFormat.getLineDelimiter() != null) {
            sd.getSerdeInfo().putToParameters("line.delim", rowFormat.getLineDelimiter());
        }
        return sd;
    }
}