/*
* 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.facebook.presto.hive.parquet;
import com.facebook.presto.hive.parquet.dictionary.ParquetBinaryDictionary;
import com.facebook.presto.hive.parquet.dictionary.ParquetDictionary;
import com.facebook.presto.hive.parquet.dictionary.ParquetDictionaryReader;
import com.facebook.presto.hive.parquet.dictionary.ParquetDoubleDictionary;
import com.facebook.presto.hive.parquet.dictionary.ParquetFloatDictionary;
import com.facebook.presto.hive.parquet.dictionary.ParquetIntegerDictionary;
import com.facebook.presto.hive.parquet.dictionary.ParquetLongDictionary;
import parquet.bytes.BytesUtils;
import parquet.column.ColumnDescriptor;
import parquet.column.values.ValuesReader;
import parquet.column.values.bitpacking.ByteBitPackingValuesReader;
import parquet.column.values.boundedint.ZeroIntegerValuesReader;
import parquet.column.values.delta.DeltaBinaryPackingValuesReader;
import parquet.column.values.deltalengthbytearray.DeltaLengthByteArrayValuesReader;
import parquet.column.values.deltastrings.DeltaByteArrayReader;
import parquet.column.values.plain.BinaryPlainValuesReader;
import parquet.column.values.plain.BooleanPlainValuesReader;
import parquet.column.values.plain.FixedLenByteArrayPlainValuesReader;
import parquet.column.values.plain.PlainValuesReader.DoublePlainValuesReader;
import parquet.column.values.plain.PlainValuesReader.FloatPlainValuesReader;
import parquet.column.values.plain.PlainValuesReader.IntegerPlainValuesReader;
import parquet.column.values.plain.PlainValuesReader.LongPlainValuesReader;
import parquet.column.values.rle.RunLengthBitPackingHybridValuesReader;
import parquet.io.ParquetDecodingException;
import java.io.IOException;
import static com.google.common.base.Preconditions.checkArgument;
import static parquet.column.values.bitpacking.Packer.BIG_ENDIAN;
import static parquet.schema.PrimitiveType.PrimitiveTypeName.BINARY;
import static parquet.schema.PrimitiveType.PrimitiveTypeName.BOOLEAN;
import static parquet.schema.PrimitiveType.PrimitiveTypeName.FIXED_LEN_BYTE_ARRAY;
import static parquet.schema.PrimitiveType.PrimitiveTypeName.INT32;
public enum ParquetEncoding
{
PLAIN {
@Override
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
switch (descriptor.getType()) {
case BOOLEAN:
return new BooleanPlainValuesReader();
case BINARY:
return new BinaryPlainValuesReader();
case FLOAT:
return new FloatPlainValuesReader();
case DOUBLE:
return new DoublePlainValuesReader();
case INT32:
return new IntegerPlainValuesReader();
case INT64:
return new LongPlainValuesReader();
case INT96:
return new FixedLenByteArrayPlainValuesReader(INT96_TYPE_LENGTH);
case FIXED_LEN_BYTE_ARRAY:
return new FixedLenByteArrayPlainValuesReader(descriptor.getTypeLength());
default:
throw new ParquetDecodingException("Plain values reader does not support: " + descriptor.getType());
}
}
@Override
public ParquetDictionary initDictionary(ColumnDescriptor descriptor, ParquetDictionaryPage dictionaryPage)
throws IOException
{
switch (descriptor.getType()) {
case BINARY:
return new ParquetBinaryDictionary(dictionaryPage);
case FIXED_LEN_BYTE_ARRAY:
return new ParquetBinaryDictionary(dictionaryPage, descriptor.getTypeLength());
case INT96:
return new ParquetBinaryDictionary(dictionaryPage, INT96_TYPE_LENGTH);
case INT64:
return new ParquetLongDictionary(dictionaryPage);
case DOUBLE:
return new ParquetDoubleDictionary(dictionaryPage);
case INT32:
return new ParquetIntegerDictionary(dictionaryPage);
case FLOAT:
return new ParquetFloatDictionary(dictionaryPage);
default:
throw new ParquetDecodingException("Dictionary encoding does not support: " + descriptor.getType());
}
}
},
RLE {
@Override
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
int bitWidth = BytesUtils.getWidthFromMaxInt(getMaxLevel(descriptor, valuesType));
if (bitWidth == 0) {
return new ZeroIntegerValuesReader();
}
return new RunLengthBitPackingHybridValuesReader(bitWidth);
}
},
BIT_PACKED {
@Override
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
return new ByteBitPackingValuesReader(getMaxLevel(descriptor, valuesType), BIG_ENDIAN);
}
},
PLAIN_DICTIONARY {
@Override
public ValuesReader getDictionaryBasedValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType, ParquetDictionary dictionary)
{
return RLE_DICTIONARY.getDictionaryBasedValuesReader(descriptor, valuesType, dictionary);
}
@Override
public ParquetDictionary initDictionary(ColumnDescriptor descriptor, ParquetDictionaryPage dictionaryPage)
throws IOException
{
return PLAIN.initDictionary(descriptor, dictionaryPage);
}
@Override
public boolean usesDictionary()
{
return true;
}
},
DELTA_BINARY_PACKED {
@Override
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
checkArgument(descriptor.getType() == INT32, "Encoding DELTA_BINARY_PACKED is only supported for type INT32");
return new DeltaBinaryPackingValuesReader();
}
},
DELTA_LENGTH_BYTE_ARRAY {
@Override
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
checkArgument(descriptor.getType() == BINARY, "Encoding DELTA_LENGTH_BYTE_ARRAY is only supported for type BINARY");
return new DeltaLengthByteArrayValuesReader();
}
},
DELTA_BYTE_ARRAY {
@Override
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
checkArgument(
descriptor.getType() == BINARY || descriptor.getType() == FIXED_LEN_BYTE_ARRAY,
"Encoding DELTA_BYTE_ARRAY is only supported for type BINARY and FIXED_LEN_BYTE_ARRAY");
return new DeltaByteArrayReader();
}
},
RLE_DICTIONARY {
@Override
public ValuesReader getDictionaryBasedValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType, ParquetDictionary dictionary)
{
return new ParquetDictionaryReader(dictionary);
}
@Override
public ParquetDictionary initDictionary(ColumnDescriptor descriptor, ParquetDictionaryPage dictionaryPage)
throws IOException
{
return PLAIN.initDictionary(descriptor, dictionaryPage);
}
@Override
public boolean usesDictionary()
{
return true;
}
};
static final int INT96_TYPE_LENGTH = 12;
static int getMaxLevel(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
switch (valuesType) {
case REPETITION_LEVEL:
return descriptor.getMaxRepetitionLevel();
case DEFINITION_LEVEL:
return descriptor.getMaxDefinitionLevel();
case VALUES:
if (descriptor.getType() == BOOLEAN) {
return 1;
}
default:
throw new ParquetDecodingException("Unsupported Parquet values type: " + valuesType);
}
}
public boolean usesDictionary()
{
return false;
}
public ParquetDictionary initDictionary(ColumnDescriptor descriptor, ParquetDictionaryPage dictionaryPage)
throws IOException
{
throw new UnsupportedOperationException("Parquet Dictionary encoding is not supported for: " + name());
}
public ValuesReader getValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType)
{
throw new UnsupportedOperationException("Error decoding Parquet values in encoding: " + this.name());
}
public ValuesReader getDictionaryBasedValuesReader(ColumnDescriptor descriptor, ParquetValuesType valuesType, ParquetDictionary dictionary)
{
throw new UnsupportedOperationException("Parquet Dictionary encoding is not supported for: " + name());
}
}