[
https://issues.apache.org/jira/browse/DRILL-5359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15929297#comment-15929297
]
ASF GitHub Bot commented on DRILL-5359:
---------------------------------------
GitHub user jinfengni opened a pull request:
https://github.com/apache/drill/pull/786
DRILL-5359: Fix ClassCastException when Drill pushes down filter on t…
…he output of flatten operator.
- Move findItemOrFlatten as a static method in DrillRelOptUtil.
- Exclude filter conditions if they contain item/flatten operator.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinfengni/incubator-drill DRILL-5359
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/786.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #786
----
commit 73d4859afae0818f2f907fcf33d2ae9430efe728
Author: Jinfeng Ni <[email protected]>
Date: 2017-03-16T21:44:35Z
DRILL-5359: Fix ClassCastException when Drill pushes down filter on the
output of flatten operator.
- Move findItemOrFlatten as a static method in DrillRelOptUtil.
- Exclude filter conditions if they contain item/flatten operator.
----
> ClassCastException when push down filter on the output of flatten into
> parquet scan
> -----------------------------------------------------------------------------------
>
> Key: DRILL-5359
> URL: https://issues.apache.org/jira/browse/DRILL-5359
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.9.0
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
> Fix For: 1.11.0
>
>
> The following simplified query would hit ClassCastException.
> {code}
> select n_regionkey
> from (select n_regionkey,
> flatten(nation.cities) as cities
> from cp.`tpch/nation.parquet` nation) as flattenedCities
> where flattenedCities.cities.`zip` = '12345';
> {code}
> Here is the stacktrace for the Exception :
> {code}
> caused by: java.lang.ClassCastException:
> org.apache.drill.common.expression.FunctionCall cannot be cast to
> org.apache.drill.common.expression.SchemaPath
> at
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.visitCall(DrillOptiq.java:170)
> ~[classes/:na]
> at
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.visitCall(DrillOptiq.java:80)
> ~[classes/:na]
> at org.apache.calcite.rex.RexCall.accept(RexCall.java:107)
> ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19]
> at
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.doFunction(DrillOptiq.java:205)
> ~[classes/:na]
> at
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.visitCall(DrillOptiq.java:105)
> ~[classes/:na]
> at
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.visitCall(DrillOptiq.java:80)
> ~[classes/:na]
> at org.apache.calcite.rex.RexCall.accept(RexCall.java:107)
> ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19]
> at
> org.apache.drill.exec.planner.logical.DrillOptiq.toDrill(DrillOptiq.java:77)
> ~[classes/:na]
> at
> org.apache.drill.exec.store.parquet.ParquetPushDownFilter.doOnMatch(ParquetPushDownFilter.java:141)
> ~[classes/:na]
> at
> org.apache.drill.exec.store.parquet.ParquetPushDownFilter$1.onMatch(ParquetPushDownFilter.java:68)
> ~[classes/:na]
> {code}
> The cause of this problem: Parquet filter pushdown rule tries to push a
> filter expression containing item/flatten operators into parquet scan.
> However, the method DrillOptiq.toDrill() does not allow such expression
> (since "flatten" is not a scalar function).
> The solution is to disable pushing such filter expression. Even the rule
> allows, the underneath parquet metadata would not have the corresponding
> statistics; there is no point to considering push such filter expression.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
