Vova Vysotskyi created DRILL-7865:
-------------------------------------
Summary: 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
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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