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https://issues.apache.org/jira/browse/TAJO-505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872873#comment-13872873
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Hyunsik Choi commented on TAJO-505:
-----------------------------------
Two input column, three targets, three output columns are collect If we have a
table with 3 columns include 1 partition column. Target means an aliased
expression, each of which can be field reference or constant values. So, the
third target corresponding to 1 partition column must be replaced with constant
value obtained from a table file patch in SeqScanExec. I'm expecting that this
part has some problem. This problem seems to be related to TAJO-485.
Could you show me an SQL example? I would like to reproduce this problem.
> SeqScanExec.rewriteColumnPartitionedTableSchema has a bug
> ---------------------------------------------------------
>
> Key: TAJO-505
> URL: https://issues.apache.org/jira/browse/TAJO-505
> Project: Tajo
> Issue Type: Bug
> Components: distributed query plan
> Affects Versions: 0.8-incubating
> Reporter: Min Zhou
>
> SeqScanExec.rewriteColumnPartitionedTableSchema only rewrites inputSchema,
> remove the partition columns from input schema. but doesn't change
> plan.getTargets().
> If we have a table with 3 columns include 1 partition column, my query select
> all the 3 of them. Then the input schema will be rewritted into 2 columns,
> and plan.getTargets still have 3 columns.
> After that, evalContexts which based on plan.getTargets() will be supposed to
> evaluate 3 columns.
> {noformat}
> this.projector = new Projector(inSchema, outSchema, plan.getTargets());
> this.evalContexts = projector.renew();
> {noformat}
> This line will cause NullPointerException due to evalContexts evaluate 3
> columns
> {noformat}
> projector.eval(evalContexts, tuple);
> {noformat}
> Here is an example
> {noformat}
> 2014-01-14 18:43:52,687 ERROR worker.Task (Task.java:run(378)) -
> java.lang.NullPointerException
> at org.apache.tajo.catalog.Schema.getColumnId(Schema.java:142)
> at org.apache.tajo.engine.eval.FieldEval.eval(FieldEval.java:51)
> at org.apache.tajo.engine.planner.Projector.eval(Projector.java:87)
> at
> org.apache.tajo.engine.planner.physical.SeqScanExec.next(SeqScanExec.java:174)
> at
> org.apache.tajo.engine.planner.physical.HashAggregateExec.compute(HashAggregateExec.java:57)
> at
> org.apache.tajo.engine.planner.physical.HashAggregateExec.next(HashAggregateExec.java:83)
> at
> org.apache.tajo.engine.planner.physical.HashShuffleFileWriteExec.next(HashShuffleFileWriteExec.java:117)
> at org.apache.tajo.worker.Task.run(Task.java:370)
> at org.apache.tajo.worker.TaskRunner$1.run(TaskRunner.java:392)
> at java.lang.Thread.run(Thread.java:724)
> {noformat}
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