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https://issues.apache.org/jira/browse/DRILL-7865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17287640#comment-17287640
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ASF GitHub Bot commented on DRILL-7865:
---------------------------------------
vvysotskyi merged pull request #2176:
URL: https://github.com/apache/drill/pull/2176
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> Unable to apply DrillPushLimitToScanRule due to NPE
> ---------------------------------------------------
>
> Key: DRILL-7865
> URL: https://issues.apache.org/jira/browse/DRILL-7865
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Vova Vysotskyi
> Assignee: Vova Vysotskyi
> Priority: Major
>
> At some point of planning, DrillPushLimitToScanRule fails with NPE, here is
> the stack trace:
> {noformat}
> WARN o.a.d.e.p.l.DrillPushLimitToScanRule - Exception while using the pruned
> partitions.
> java.lang.NullPointerException: null
> at
> org.apache.drill.exec.store.dfs.easy.EasyGroupScan.initFromSelection(EasyGroupScan.java:192)
> at
> org.apache.drill.exec.store.dfs.easy.EasyGroupScan.access$1300(EasyGroupScan.java:77)
> at
> org.apache.drill.exec.store.dfs.easy.EasyGroupScan$EasyGroupScanFilterer.build(EasyGroupScan.java:414)
> at
> org.apache.drill.exec.physical.base.AbstractGroupScanWithMetadata.applyLimit(AbstractGroupScanWithMetadata.java:470)
> at
> org.apache.drill.exec.planner.logical.DrillPushLimitToScanRule.doOnMatch(DrillPushLimitToScanRule.java:98)
> at
> org.apache.drill.exec.planner.logical.DrillPushLimitToScanRule$1.onMatch(DrillPushLimitToScanRule.java:56)
> at
> org.apache.calcite.plan.AbstractRelOptPlanner.fireRule(AbstractRelOptPlanner.java:319)
> at org.apache.calcite.plan.hep.HepPlanner.applyRule(HepPlanner.java:561)
> at
> org.apache.calcite.plan.hep.HepPlanner.applyRules(HepPlanner.java:420)
> at
> org.apache.calcite.plan.hep.HepPlanner.executeInstruction(HepPlanner.java:257)
> at
> org.apache.calcite.plan.hep.HepInstruction$RuleInstance.execute(HepInstruction.java:127)
> at
> org.apache.calcite.plan.hep.HepPlanner.executeProgram(HepPlanner.java:216)
> at
> org.apache.calcite.plan.hep.HepPlanner.findBestExp(HepPlanner.java:203)
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform(DefaultSqlHandler.java:394)
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform(DefaultSqlHandler.java:351)
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform(DefaultSqlHandler.java:338)
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToRawDrel(DefaultSqlHandler.java:252)
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:308)
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan(DefaultSqlHandler.java:173)
> at
> org.apache.drill.exec.planner.sql.DrillSqlWorker.getQueryPlan(DrillSqlWorker.java:283)
> at
> org.apache.drill.exec.planner.sql.DrillSqlWorker.getPhysicalPlan(DrillSqlWorker.java:163)
> at
> org.apache.drill.exec.planner.sql.DrillSqlWorker.convertPlan(DrillSqlWorker.java:128)
> at
> org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan(DrillSqlWorker.java:93)
> at org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:593)
> at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:274)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
> This stack trace may be observed for example for
> {{TestImageRecordReader.testLimitPushdown()}} test.
> Though the query is not failed, it may prevent applying limit pushdown for
> some cases.
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