org.apache.hadoop.hive.ql.optimizer.stats.annotation

Class StatsRulesProcFactory.ReduceSinkStatsRule

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory.DefaultStatsRule

org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory.ReduceSinkStatsRule

All Implemented Interfaces:

NodeProcessor

Enclosing class:

StatsRulesProcFactory

public static class StatsRulesProcFactory.ReduceSinkStatsRule
extends StatsRulesProcFactory.DefaultStatsRule
implements NodeProcessor

ReduceSink operator does not change any of the statistics. But it renames the column statistics from its parent based on the output key and value column names to make it easy for the downstream operators. This is different from the default stats which just aggregates and passes along the statistics without actually renaming based on output schema of the operator.

Constructor Summary

Constructors

Constructor and Description
ReduceSinkStatsRule()

Method Summary

Modifier and Type	Method and Description
Object	process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs) Generic process for all ops that don't have specific implementations.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReduceSinkStatsRule

public ReduceSinkStatsRule()

Method Detail

process

public Object process(Node nd,
                      Stack<Node> stack,
                      NodeProcessorCtx procCtx,
                      Object... nodeOutputs)
               throws SemanticException

Description copied from interface: NodeProcessor

Generic process for all ops that don't have specific implementations.

Specified by:

process in interface NodeProcessor

Overrides:

process in class StatsRulesProcFactory.DefaultStatsRule

Parameters:

nd - operator to process

procCtx - operator processor context

nodeOutputs - A variable argument list of outputs from other nodes in the walk

Returns:

Object to be returned by the process call

Throws:

SemanticException