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https://issues.apache.org/jira/browse/DRILL-3937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14992049#comment-14992049
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Victoria Markman commented on DRILL-3937:
-----------------------------------------
[~rkins] does this bug look like DRILL-3847 to you ? Reproductions are
different, but the stack trace looks very similar to me.
> We are not pruning when we have a metadata cache and auto partitioned data in
> some cases
> ----------------------------------------------------------------------------------------
>
> Key: DRILL-3937
> URL: https://issues.apache.org/jira/browse/DRILL-3937
> Project: Apache Drill
> Issue Type: Bug
> Components: Metadata
> Reporter: Rahul Challapalli
> Assignee: Aman Sinha
> Fix For: 1.3.0
>
> Attachments: 1_0_9998.parquet, 1_0_9999.parquet
>
>
> git.commit.id.abbrev=2736412
> The below plan indicates that we are not pruning
> {code}
> explain plan for select count(*) from dfs.`/drill/comscore/orders2` where
> o_clerk='Clerk#000079443';
> +------+------+
> | text | json |
> +------+------+
> | 00-00 Screen
> 00-01 Project(EXPR$0=[$0])
> 00-02 StreamAgg(group=[{}], EXPR$0=[COUNT()])
> 00-03 Project($f0=[0])
> 00-04 SelectionVectorRemover
> 00-05 Filter(condition=[=($0, 'Clerk#000079443')])
> 00-06 Scan(groupscan=[ParquetGroupScan
> [entries=[ReadEntryWithPath
> [path=maprfs:///drill/comscore/orders2/1_0_9999.parquet], ReadEntryWithPath
> [path=maprfs:///drill/comscore/orders2/1_0_9998.parquet]],
> selectionRoot=/drill/comscore/orders2, numFiles=2, usedMetadataFile=true,
> columns=[`o_clerk`]]])
> {code}
> Error from the logs
> {code}
> 2015-10-15 01:24:28,467 [29e0ffb4-1c91-f40a-8bf0-5e3665dcf107:foreman] WARN
> o.a.d.e.p.l.partition.PruneScanRule - Exception while trying to prune
> partition.
> java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to
> parquet.io.api.Binary
> at
> org.apache.drill.exec.store.parquet.ParquetGroupScan.populatePruningVector(ParquetGroupScan.java:414)
> ~[drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.ParquetPartitionDescriptor.populatePartitionVectors(ParquetPartitionDescriptor.java:96)
> ~[drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.logical.partition.PruneScanRule.doOnMatch(PruneScanRule.java:212)
> ~[drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.logical.partition.ParquetPruneScanRule$2.onMatch(ParquetPruneScanRule.java:87)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:228)
> [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:808)
> [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at
> org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:303)
> [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at
> org.apache.calcite.prepare.PlannerImpl.transform(PlannerImpl.java:303)
> [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.logicalPlanningVolcanoAndLopt(DefaultSqlHandler.java:545)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:213)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:248)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.sql.handlers.ExplainHandler.getPlan(ExplainHandler.java:61)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan(DrillSqlWorker.java:178)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:905)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:244)
> [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> [na:1.7.0_71]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_71]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_71]
> {code}
> The partition column type in this case is binary which could be causing the
> issue.
> Partition pruning seems to be working when we have Metadata Caching + Auto
> Partitioned Files with integer partition column
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