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

Class AbstractArrayWriter.BaseArrayWriter

java.lang.Object

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

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

All Implemented Interfaces:

ArrayWriter, ColumnWriter, WriterEvents, WriterPosition

Direct Known Subclasses:

ObjectArrayWriter, ScalarArrayWriter

Enclosing class:

AbstractArrayWriter

public abstract static class AbstractArrayWriter.BaseArrayWriter
extends AbstractArrayWriter

Nested Class Summary

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

AbstractArrayWriter.ArrayElementWriterIndex, AbstractArrayWriter.ArrayObjectWriter, AbstractArrayWriter.BaseArrayWriter

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.AbstractArrayWriter

elementIndex, elementObjWriter, offsetsWriter, outerIndex

Constructor Summary

Constructors

Constructor	Description
BaseArrayWriter(ColumnMetadata schema, UInt4Vector offsetVector, AbstractObjectWriter elementObjWriter)

Method Summary

Modifier and Type	Method	Description
void	bindIndex(ColumnWriterIndex index)	Bind the writer to a writer index.
void	dump(HierarchicalFormatter format)
void	endArrayValue()	End a value.
void	endWrite()	End a batch: finalize any vector values.
int	lastWriteIndex()	Return the last write position in the vector.
void	postRollover()	The vectors backing this writer rolled over.
void	preRollover()	The vectors backing this vector are about to roll over.
void	restartRow()	During a writer to a row, rewind the the current index position to restart the row.
void	saveRow()	Saves a row.
void	startRow()	Start a new row.
void	startWrite()	Start a write (batch) operation.

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

array, bindListener, copy, dict, entry, entryType, isProjected, nullable, offsetWriter, rowStartIndex, scalar, schema, setNull, setNull, size, tuple, type, variant, writeIndex

Methods inherited from class java.lang.Object

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

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

save

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

setObject

Constructor Details

BaseArrayWriter

public BaseArrayWriter(ColumnMetadata schema,
 UInt4Vector offsetVector,
 AbstractObjectWriter elementObjWriter)

Method Details

bindIndex

public void bindIndex(ColumnWriterIndex index)

Description copied from interface: WriterEvents

Bind the writer to a writer index.

Parameters:

index - the writer index (top level or nested for arrays)

startWrite

public void startWrite()

Description copied from interface: WriterEvents

Start a write (batch) operation. Performs any vector initialization required at the start of a batch (especially for offset vectors.)

startRow

public void startRow()

Description copied from interface: WriterEvents

Start a new row. To be called only when a row is not active. To restart a row, call WriterEvents.restartRow() instead.

endArrayValue

public void endArrayValue()

Description copied from interface: WriterEvents

End a value. Similar to WriterEvents.saveRow(), but the save of a value is conditional on saving the row. This version is primarily of use in tuples nested inside arrays: it saves each tuple within the array, advancing to a new position in the array. The update of the array's offset vector based on the cumulative value saves is done when saving the row.

restartRow

public void restartRow()

Description copied from interface: WriterEvents

During a writer to a row, rewind the the current index position to restart the row. Done when abandoning the current row, such as when filtering out a row at read time.

saveRow

public void saveRow()

Description copied from interface: WriterEvents

Saves a row. Commits offset vector locations and advances each to the next position. Can be called only when a row is active.

preRollover

public void preRollover()

Description copied from interface: WriterEvents

The vectors backing this vector are about to roll over. Finish the current batch up to, but not including, the current row.

postRollover

public void postRollover()

Description copied from interface: WriterEvents

The vectors backing this writer rolled over. This means that data for the current row has been rolled over into a new vector. Offsets and indexes should be shifted based on the understanding that data for the current row now resides at the start of a new vector instead of its previous location elsewhere in an old vector.

endWrite

public void endWrite()

Description copied from interface: WriterEvents

End a batch: finalize any vector values.

lastWriteIndex

public int lastWriteIndex()

Description copied from interface: WriterPosition

Return the last write position in the vector. This may be the same as the writer index position (if the vector was written at that point), or an earlier point. In either case, this value points to the last valid value in the vector.

Specified by:

lastWriteIndex in interface WriterPosition

Overrides:

lastWriteIndex in class AbstractArrayWriter

Returns:

index of the last valid value in the vector

dump

public void dump(HierarchicalFormatter format)

Specified by:

dump in interface WriterEvents

Overrides:

dump in class AbstractArrayWriter