org.apache.drill.exec.store.parquet.columnreaders

Class BatchReader.MockBatchReader

java.lang.Object

org.apache.drill.exec.store.parquet.columnreaders.BatchReader

org.apache.drill.exec.store.parquet.columnreaders.BatchReader.MockBatchReader

Enclosing class:

BatchReader

public static class BatchReader.MockBatchReader
extends BatchReader

Strategy for reading mock records. Mock records appear to occur in the case in which the query has SELECT a, b, but the Parquet file has only c, d. A mock scan reads dummy columns for all records to ensure that the batch contains a record for each Parquet record, but with no data per record. (This explanation is reverse-engineered from the code and may be wrong. Caveat emptor!)

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.store.parquet.columnreaders.BatchReader

BatchReader.FixedWidthReader, BatchReader.MockBatchReader, BatchReader.VariableWidthReader

Field Summary

Fields inherited from class org.apache.drill.exec.store.parquet.columnreaders.BatchReader

readState

Constructor Summary

Constructors

Constructor and Description
BatchReader.MockBatchReader(ReadState readState)

Method Summary

Methods

Modifier and Type	Method and Description
protected long	getReadCount(ColumnReader<?> firstColumnStatus)
protected int	readRecords(ColumnReader<?> firstColumnStatus, long recordsToRead)

Methods inherited from class org.apache.drill.exec.store.parquet.columnreaders.BatchReader

readAllFixedFields, readAllFixedFieldsParallel, readAllFixedFieldsSerial, readBatch

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BatchReader.MockBatchReader

public BatchReader.MockBatchReader(ReadState readState)

Method Detail

getReadCount

protected long getReadCount(ColumnReader<?> firstColumnStatus)

Specified by:

getReadCount in class BatchReader

readRecords

protected int readRecords(ColumnReader<?> firstColumnStatus,
              long recordsToRead)

Specified by:

readRecords in class BatchReader