Package org.apache.drill.exec.physical.resultSet.impl

Class SingleVectorState.VariableWidthVectorState

java.lang.Object

org.apache.drill.exec.physical.resultSet.impl.SingleVectorState

org.apache.drill.exec.physical.resultSet.impl.SingleVectorState.SimpleVectorState

org.apache.drill.exec.physical.resultSet.impl.SingleVectorState.VariableWidthVectorState

All Implemented Interfaces:

VectorState

Enclosing class:

SingleVectorState

public static class SingleVectorState.VariableWidthVectorState
extends SingleVectorState.SimpleVectorState

State for a scalar value vector. The vector might be for a simple (non-array) vector, or might be the payload part of a scalar array (repeated scalar) vector.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.physical.resultSet.impl.SingleVectorState

SingleVectorState.FixedWidthVectorState, SingleVectorState.IsSetVectorState, SingleVectorState.OffsetVectorState, SingleVectorState.SimpleVectorState, SingleVectorState.VariableWidthVectorState

Field Summary

Fields inherited from class org.apache.drill.exec.physical.resultSet.impl.SingleVectorState

backupVector, mainVector, writer

Constructor Summary

Constructors

Constructor	Description
VariableWidthVectorState(ColumnMetadata schema, WriterEvents writer, ValueVector mainVector)

Method Summary

Modifier and Type	Method	Description
int	allocateVector(ValueVector vector, int cardinality)
void	rollover(int cardinality)	A column within the row batch overflowed.

Methods inherited from class org.apache.drill.exec.physical.resultSet.impl.SingleVectorState.SimpleVectorState

copyOverflow

Methods inherited from class org.apache.drill.exec.physical.resultSet.impl.SingleVectorState

allocate, close, dump, harvestWithLookAhead, isProjected, parseVectorType, startBatchWithLookAhead, vector, vectorState

Methods inherited from class java.lang.Object

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

Constructor Details

VariableWidthVectorState

public VariableWidthVectorState(ColumnMetadata schema,
 WriterEvents writer,
 ValueVector mainVector)

Method Details

allocateVector

public int allocateVector(ValueVector vector,
 int cardinality)

Specified by:

allocateVector in class SingleVectorState

rollover

public void rollover(int cardinality)

Description copied from class: SingleVectorState

A column within the row batch overflowed. Prepare to absorb the rest of the in-flight row by rolling values over to a new vector, saving the complete vector for later. This column could have a value for the overflow row, or for some previous row, depending on exactly when and where the overflow occurs. sourceStartIndex: the index of the row that caused the overflow, the values of which should be copied to a new "look-ahead" vector. If the vector is an array, then the overflowIndex is the position of the first element to be moved, and multiple elements may need to move

Specified by:

rollover in interface VectorState

Overrides:

rollover in class SingleVectorState

Parameters:

cardinality - the number of unique columns in the row