org.apache.hadoop.hive.ql.lib

Class SubqueryExpressionWalker

java.lang.Object

org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

org.apache.hadoop.hive.ql.lib.ExpressionWalker

org.apache.hadoop.hive.ql.lib.SubqueryExpressionWalker

All Implemented Interfaces:

GraphWalker, SemanticGraphWalker

public class SubqueryExpressionWalker
extends ExpressionWalker

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

dispatcher, opQueue, opStack, retMap, toWalk

Constructor Summary

Constructors

Constructor and Description
SubqueryExpressionWalker(SemanticDispatcher disp) Constructor.

Method Summary

Modifier and Type	Method and Description
protected boolean	shouldByPass(Node childNode, Node parentNode) We should bypass subquery since we have already processed and created logical plan (in genLogicalPlan) for subquery at this point.

Methods inherited from class org.apache.hadoop.hive.ql.lib.ExpressionWalker

walk

Methods inherited from class org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

dispatch, dispatchAndReturn, getDispatchedList, startWalking

Methods inherited from class java.lang.Object

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

Constructor Detail

SubqueryExpressionWalker

public SubqueryExpressionWalker(SemanticDispatcher disp)

Constructor.

Parameters:

disp - dispatcher to call for each op encountered

Method Detail

shouldByPass

protected boolean shouldByPass(Node childNode,
                               Node parentNode)

We should bypass subquery since we have already processed and created logical plan (in genLogicalPlan) for subquery at this point. SubQueryExprProcessor will use generated plan and creates appropriate ExprNodeSubQueryDesc.

Overrides:

shouldByPass in class ExpressionWalker