Package org.apache.drill.exec.expr.fn.impl

Class SchemaFunctions.MergeNullableSchemaFunction

java.lang.Object

org.apache.drill.exec.expr.fn.impl.SchemaFunctions.MergeNullableSchemaFunction

All Implemented Interfaces:

DrillAggFunc, DrillFunc

Enclosing class:

SchemaFunctions

public static class SchemaFunctions.MergeNullableSchemaFunction
extends Object
implements DrillAggFunc

Aggregate function which accepts VarChar column with string representations of TupleMetadata and returns string representation of TupleMetadata with merged schema.

Constructor Summary

Constructors

Constructor	Description
MergeNullableSchemaFunction()

Method Summary

Modifier and Type	Method	Description
void	add()
void	output()
void	reset()
void	setup()	Initialization for the beginning of the aggregation.

Methods inherited from class java.lang.Object

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

Constructor Details

MergeNullableSchemaFunction

public MergeNullableSchemaFunction()

Method Details

setup

public void setup()

Description copied from interface: DrillAggFunc

Initialization for the beginning of the aggregation.

Specified by:

setup in interface DrillAggFunc

add

public void add()

Specified by:

add in interface DrillAggFunc

output

public void output()

Specified by:

output in interface DrillAggFunc

reset

public void reset()

Specified by:

reset in interface DrillAggFunc