[TAJO-1732] During filter push down phase, join conditions are not set properly

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Component/s: Planner/Optimizer
• Assignee: Jihoon Son
• Reporter: Jihoon Son
• Created: 31/Jul/15 02:51
• Updated: 11/Aug/15 07:01
• Resolved: 11/Aug/15 04:50

Description

See the title.
You can reproduce with this query.

default> select
  n1.n_name as supp_nation, n2.n_name as cust_nation, n1.n_nationkey as s_nationkey, n2.n_nationkey as c_nationkey
from
  nation n1 join nation n2
  on
    n1.n_name = 'FRANCE' and n2.n_name = 'GERMANY'
UNION ALL
select
  n1.n_name as supp_nation, n2.n_name as cust_nation, n1.n_nationkey as s_nationkey, n2.n_nationkey as c_nationkey
from
  nation n1 join nation n2
  on
    n2.n_name = 'FRANCE' and n1.n_name = 'GERMANY'

This query causes an NPE as follow:

2015-07-31 11:06:38,255 ERROR org.apache.tajo.worker.TaskImpl:
java.lang.NullPointerException
        at org.apache.tajo.plan.util.PlannerUtil.getJoinKeyPairs(PlannerUtil.java:675)
        at org.apache.tajo.engine.planner.physical.CommonHashJoinExec.<init>(CommonHashJoinExec.java:64)
        at org.apache.tajo.engine.planner.physical.HashJoinExec.<init>(HashJoinExec.java:32)
        at org.apache.tajo.engine.planner.PhysicalPlannerImpl.createBestInnerJoinPlan(PhysicalPlannerImpl.java:439)
        at org.apache.tajo.engine.planner.PhysicalPlannerImpl.createInnerJoinPlan(PhysicalPlannerImpl.java:385)
        at org.apache.tajo.engine.planner.PhysicalPlannerImpl.createJoinPlan(PhysicalPlannerImpl.java:300)
        at org.apache.tajo.engine.planner.PhysicalPlannerImpl.createPlanRecursive(PhysicalPlannerImpl.java:220)
        at org.apache.tajo.engine.planner.PhysicalPlannerImpl.createPlan(PhysicalPlannerImpl.java:92)
        at org.apache.tajo.worker.TajoQueryEngine.createPlan(TajoQueryEngine.java:40)
        at org.apache.tajo.worker.TaskImpl.run(TaskImpl.java:396)
        at org.apache.tajo.worker.TaskContainer.run(TaskContainer.java:65)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)