[teiid-issues] [JBoss JIRA] (TEIID-2688) NPE determining dependent join cost

[Steven Hawkins (JIRA)]

Steven Hawkins created TEIID-2688:
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             Summary: NPE determining dependent join cost
                 Key: TEIID-2688
                 URL: https://issues.jboss.org/browse/TEIID-2688
             Project: Teiid
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: 7.4
            Reporter: Steven Hawkins
            Assignee: Steven Hawkins
             Fix For: 8.6


Given that the initial node in the cost determination is not a select node if it is "pushed" to a point where the criteria is assumed to exist, then an NPE is thrown:

java.lang.NullPointerException
	at org.teiid.query.optimizer.relational.rules.JoinUtil.replaceWithNullValues(JoinUtil.java:186)
	at org.teiid.query.optimizer.relational.rules.JoinUtil.isNullDependent(JoinUtil.java:141)
	at org.teiid.query.optimizer.relational.rules.JoinUtil.optimizeJoinType(JoinUtil.java:106)
	at org.teiid.query.optimizer.relational.rules.RulePushSelectCriteria.examinePath(RulePushSelectCriteria.java:356)
	at org.teiid.query.optimizer.relational.rules.NewCalculateCostUtil.determineTargets(NewCalculateCostUtil.java:1294)
	at org.teiid.query.optimizer.relational.rules.NewCalculateCostUtil.computeCostForDepJoin(NewCalculateCostUtil.java:1155)
	at org.teiid.query.optimizer.relational.rules.JoinRegion.getDepJoinCost(JoinRegion.java:373)
	at org.teiid.query.optimizer.relational.rules.JoinRegion.scoreRegion(JoinRegion.java:316)
	at org.teiid.query.optimizer.relational.rules.RulePlanJoins.findBestJoinOrder(RulePlanJoins.java:571)
	at org.teiid.query.optimizer.relational.rules.RulePlanJoins.execute(RulePlanJoins.java:173)
	at org.teiid.query.optimizer.relational.RelationalPlanner.executeRules(RelationalPlanner.java:525)
	at org.teiid.query.optimizer.relational.RelationalPlanner.optimize(RelationalPlanner.java:212)
	at org.teiid.query.optimizer.QueryOptimizer.optimizePlan(QueryOptimizer.java:195)

This will occur if the prospective dependent join for example is above an outer join such that we need to check whether pushing the criteria would alter the meaning of the join.

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