org.apache.hadoop.hive.ql.optimizer.physical.index
Class IndexWhereProcessor

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.physical.index.IndexWhereProcessor

All Implemented Interfaces:

NodeProcessor

public class IndexWhereProcessor
extends Object
implements NodeProcessor

IndexWhereProcessor. Processes Operator Nodes to look for WHERE queries with a predicate column on which we have an index. Creates an index subquery Task for these WHERE queries to use the index automatically.

Constructor Summary

IndexWhereProcessor(Map<Table,List<org.apache.hadoop.hive.metastore.api.Index>> indexes)

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

IndexWhereProcessor

public IndexWhereProcessor(Map<Table,List<org.apache.hadoop.hive.metastore.api.Index>> indexes)

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