Examples with ColumnChunk com.facebook.presto.parquet.reader.ColumnChunk used on opensource projects

Example 11 with ColumnChunk

use of com.facebook.presto.parquet.reader.ColumnChunk in project presto by prestodb.

the class Int32NestedBatchReader method readNestedNoNull.

@Override
protected ColumnChunk readNestedNoNull() throws IOException {
    int maxDefinitionLevel = columnDescriptor.getMaxDefinitionLevel();
    RepetitionLevelDecodingContext repetitionLevelDecodingContext = readRepetitionLevels(nextBatchSize);
    DefinitionLevelDecodingContext definitionLevelDecodingContext = readDefinitionLevels(repetitionLevelDecodingContext.getDLValuesDecoderContexts(), repetitionLevelDecodingContext.getRepetitionLevels().length);
    int[] definitionLevels = definitionLevelDecodingContext.getDefinitionLevels();
    int newBatchSize = 0;
    for (ValuesDecoderContext valuesDecoderContext : definitionLevelDecodingContext.getValuesDecoderContexts()) {
        int valueCount = 0;
        for (int i = valuesDecoderContext.getStart(); i < valuesDecoderContext.getEnd(); i++) {
            valueCount += (definitionLevels[i] == maxDefinitionLevel ? 1 : 0);
        }
        newBatchSize += valueCount;
        valuesDecoderContext.setNonNullCount(valueCount);
        valuesDecoderContext.setValueCount(valueCount);
    }
    int[] values = new int[newBatchSize];
    int offset = 0;
    for (ValuesDecoderContext valuesDecoderContext : definitionLevelDecodingContext.getValuesDecoderContexts()) {
        ((Int32ValuesDecoder) valuesDecoderContext.getValuesDecoder()).readNext(values, offset, valuesDecoderContext.getNonNullCount());
        offset += valuesDecoderContext.getValueCount();
    }
    Block block = new IntArrayBlock(newBatchSize, Optional.empty(), values);
    return new ColumnChunk(block, definitionLevels, repetitionLevelDecodingContext.getRepetitionLevels());
}