org.apache.hadoop.hive.ql.exec.vector.expressions
Class VectorCoalesce

java.lang.Object
  org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression
      org.apache.hadoop.hive.ql.exec.vector.expressions.VectorCoalesce

All Implemented Interfaces:

Serializable

public class VectorCoalesce
extends VectorExpression

This expression returns the value of the first non-null expression in the given set of inputs expressions.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

VectorExpression.Type

Constructor Summary

VectorCoalesce()

VectorCoalesce(int[] inputColumns, int outputColumn)

Method Summary

void	evaluate(VectorizedRowBatch batch) This is the primary method to implement expression logic.
VectorExpressionDescriptor.Descriptor	getDescriptor()
int[]	getInputColumns()
int	getOutputColumn() Returns the index of the output column in the array of column vectors.
String	getOutputType() Returns type of the output column.
void	setInputColumns(int[] inputColumns)
void	setOutputColumn(int outputColumn)

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

getChildExpressions, getInputTypes, setChildExpressions, setInputTypes, setOutputType, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

VectorCoalesce

public VectorCoalesce(int[] inputColumns,
                      int outputColumn)

VectorCoalesce

public VectorCoalesce()

Method Detail

evaluate

public void evaluate(VectorizedRowBatch batch)

Description copied from class: VectorExpression

This is the primary method to implement expression logic.

Specified by:

evaluate in class VectorExpression

getOutputColumn

public int getOutputColumn()

Description copied from class: VectorExpression

Returns the index of the output column in the array of column vectors. If not applicable, -1 is returned.

Specified by:

getOutputColumn in class VectorExpression

Returns:

Index of the output column

getOutputType

public String getOutputType()

Description copied from class: VectorExpression

Returns type of the output column.

Overrides:

getOutputType in class VectorExpression

getInputColumns

public int[] getInputColumns()

setInputColumns

public void setInputColumns(int[] inputColumns)

setOutputColumn

public void setOutputColumn(int outputColumn)

getDescriptor

public VectorExpressionDescriptor.Descriptor getDescriptor()

Specified by:

getDescriptor in class VectorExpression