org.apache.hadoop.hive.ql.optimizer.pcr
Class PcrExprProcFactory.GenericFuncExprProcessor

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.pcr.PcrExprProcFactory.GenericFuncExprProcessor

All Implemented Interfaces:

NodeProcessor

Enclosing class:

PcrExprProcFactory

public static class PcrExprProcFactory.GenericFuncExprProcessor
extends Object
implements NodeProcessor

Processor for Generic functions If it is AND, OR or NOT, we replace the node to be the constant true or false if we are sure the result from children, or cut one of the child if we know partial results. In case of both child has a result vector, we calculate the result vector for the node. If all partitions agree on a result, we replace the node with constant true or false. Otherwise, we pass the vector result. For other Generic functions, if it is non-deterministic we simply pass it (with children adjusted based on results from children). If it is deterministic, we evaluate result vector if any of the children is partition column. Otherwise, we pass it as it is.

Constructor Summary

PcrExprProcFactory.GenericFuncExprProcessor()

Method Summary

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

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

Constructor Detail

PcrExprProcFactory.GenericFuncExprProcessor

public PcrExprProcFactory.GenericFuncExprProcessor()

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

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