org.apache.drill.exec.vector.accessor.writer

Class AbstractFixedWidthWriter.BaseFixedWidthWriter

java.lang.Object

org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriter

org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter

org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter.BaseFixedWidthWriter

All Implemented Interfaces:

ColumnWriter, ScalarWriter, ValueWriter, WriterEvents, WriterPosition

Direct Known Subclasses:

AbstractFixedWidthWriter.BaseIntWriter, ColumnAccessors.BigIntColumnWriter, ColumnAccessors.DateColumnWriter, ColumnAccessors.Decimal18ColumnWriter, ColumnAccessors.Decimal28SparseColumnWriter, ColumnAccessors.Decimal38SparseColumnWriter, ColumnAccessors.Decimal9ColumnWriter, ColumnAccessors.Float4ColumnWriter, ColumnAccessors.Float8ColumnWriter, ColumnAccessors.IntervalColumnWriter, ColumnAccessors.IntervalDayColumnWriter, ColumnAccessors.IntervalYearColumnWriter, ColumnAccessors.TimeColumnWriter, ColumnAccessors.TimeStampColumnWriter, ColumnAccessors.UInt4ColumnWriter, ColumnAccessors.UInt8ColumnWriter

Enclosing class:

AbstractFixedWidthWriter

public abstract static class AbstractFixedWidthWriter.BaseFixedWidthWriter
extends AbstractFixedWidthWriter

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

AbstractFixedWidthWriter.BaseFixedWidthWriter, AbstractFixedWidthWriter.BaseIntWriter

Nested classes/interfaces inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

AbstractScalarWriterImpl.ScalarObjectWriter

Nested classes/interfaces inherited from interface org.apache.drill.exec.vector.accessor.writer.WriterEvents

WriterEvents.ColumnWriterListener, WriterEvents.State

Field Summary

Fields inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

lastWriteIndex

Fields inherited from class org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter

capacity, drillBuf, emptyValue, listener, MIN_BUFFER_SIZE

Fields inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

schema, vectorIndex

Constructor Summary

Constructors

Constructor and Description
BaseFixedWidthWriter()

Method Summary

Modifier and Type	Method and Description
protected void	fillEmpties(int writeIndex) Fill empties.
protected int	prepareWrite() Determine the write index, growing, overflowing and back-filling the vector as needed.
protected int	prepareWrite(int writeIndex)

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

dump, endWrite, lastWriteIndex, mandatoryResize, postRollover, preRollover, resize, restartRow, setBuffer, setLastWriteIndex, setValueCount, skipNulls, startWrite, width

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter

appendBytes, bindListener, bindSchema, canExpand, nullable, overflowed, realloc, setBoolean, setBytes, setDate, setDecimal, setDouble, setFloat, setInt, setLong, setNull, setPeriod, setString, setTime, setTimestamp

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

bindIndex, endArrayValue, isProjected, rowStartIndex, saveRow, schema, startRow, type, vector, writeIndex

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriter

conversionError, extendedType, setObject, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.exec.vector.accessor.ScalarWriter

setDefaultValue, valueType

Methods inherited from interface org.apache.drill.exec.vector.accessor.ColumnWriter

copy

Methods inherited from interface org.apache.drill.exec.vector.accessor.ValueWriter

setValue

Constructor Detail

BaseFixedWidthWriter

public BaseFixedWidthWriter()

Method Detail

prepareWrite

protected final int prepareWrite()

Determine the write index, growing, overflowing and back-filling the vector as needed.

This is a bit tricky. This method has side effects, by design. The current vector buffer, and buffer address, will change in this method when a vector grows or overflows. So, don't use this method in inline calls of the form
vector.getBuffer().doSomething(prepareWrite());
The buffer obtained by getBuffer() can be different than the current buffer after prepareWrite().

Returns:

the index at which to write the current value

prepareWrite

protected final int prepareWrite(int writeIndex)

fillEmpties

protected final void fillEmpties(int writeIndex)

Fill empties. This is required because the allocated memory is not zero-filled. Also allows filling a non-nullable vector with a defined default value.

Specified by:

fillEmpties in class AbstractFixedWidthWriter