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https://issues.apache.org/jira/browse/DRILL-4517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489315#comment-16489315
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Arina Ielchiieva commented on DRILL-4517:
-----------------------------------------
We need to implement dummy reader for those file types that have schema
(parquet, avro) which would output the schema when there is no rows. Similar
behavior we have for Hive empty tables.
> Reading emtpy Parquet file failes with java.lang.IllegalArgumentException
> -------------------------------------------------------------------------
>
> Key: DRILL-4517
> URL: https://issues.apache.org/jira/browse/DRILL-4517
> Project: Apache Drill
> Issue Type: Bug
> Components: Server
> Reporter: Tobias
> Priority: Major
> Attachments: empty.parquet, no_rows.parquet
>
>
> When querying a Parquet file that has a schema but no rows the Drill Server
> will fail with the below
> This looks similar to DRILL-3557
> {noformat}
> {{ParquetMetaData{FileMetaData{schema: message TRANSACTION_REPORT {
> required int64 MEMBER_ACCOUNT_ID;
> required int64 TIMESTAMP_IN_HOUR;
> optional int64 APPLICATION_ID;
> }
> , metadata: {}}}, blocks: []}
> {noformat}
> {noformat}
> Caused by: java.lang.IllegalArgumentException: MinorFragmentId 0 has no read
> entries assigned
> at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:92)
> ~[guava-14.0.1.jar:na]
> at
> org.apache.drill.exec.store.parquet.ParquetGroupScan.getSpecificScan(ParquetGroupScan.java:707)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.store.parquet.ParquetGroupScan.getSpecificScan(ParquetGroupScan.java:105)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.Materializer.visitGroupScan(Materializer.java:68)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.Materializer.visitGroupScan(Materializer.java:35)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.physical.base.AbstractGroupScan.accept(AbstractGroupScan.java:60)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.Materializer.visitOp(Materializer.java:102)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.Materializer.visitOp(Materializer.java:35)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.physical.base.AbstractPhysicalVisitor.visitProject(AbstractPhysicalVisitor.java:77)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.physical.config.Project.accept(Project.java:51)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.Materializer.visitStore(Materializer.java:82)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.Materializer.visitStore(Materializer.java:35)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.physical.base.AbstractPhysicalVisitor.visitScreen(AbstractPhysicalVisitor.java:195)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.physical.config.Screen.accept(Screen.java:97)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.SimpleParallelizer.generateWorkUnit(SimpleParallelizer.java:355)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.planner.fragment.SimpleParallelizer.getFragments(SimpleParallelizer.java:134)
> ~[drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.work.foreman.Foreman.getQueryWorkUnit(Foreman.java:518)
> [drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.work.foreman.Foreman.runPhysicalPlan(Foreman.java:405)
> [drill-java-exec-1.5.0.jar:1.5.0]
> at
> org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:926)
> [drill-java-exec-1.5.0.jar:1.5.0]
> {noformat}
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