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https://issues.apache.org/jira/browse/DRILL-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727626#comment-14727626
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Sean Hsuan-Yi Chu commented on DRILL-3731:
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[~jni] Can I work on this one ?
> Partition Pruning not taking place when we have case statement within the
> filter
> --------------------------------------------------------------------------------
>
> Key: DRILL-3731
> URL: https://issues.apache.org/jira/browse/DRILL-3731
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.2.0
> Reporter: Rahul Challapalli
> Assignee: Jinfeng Ni
> Fix For: 1.2.0
>
> Attachments: lineitempart.tgz
>
>
> Commit # 8f33c3d55228a98ea2a309490ecbfb7a180f012c
> Partition Pruning is not taking place in the below query
> {code}
> explain plan for select count(*) from
> `/drill/testdata/partition_pruning/dfs/lineitempart` where case when
> dir0=1991 then null else 1 end is null or dir0=1992;
> 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=[OR(IS NULL(CASE(=($0, 1991), null, 1)),
> =($0, 1992))])
> 00-06 Scan(groupscan=[EasyGroupScan
> [selectionRoot=maprfs:/drill/testdata/partition_pruning/dfs/lineitempart,
> numFiles=7, columns=[`dir0`],
> files=[maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1991/lineitemaa.tbl,
>
> maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1992/lineitemab.tbl,
>
> maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1996/lineitemaf.tbl,
>
> maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1994/lineitemad.tbl,
>
> maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1993/lineitemac.tbl,
>
> maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1997/lineitemag.tbl,
>
> maprfs:/drill/testdata/partition_pruning/dfs/lineitempart/1995/lineitemae.tbl]]])
> {code}
> The planner should have pruned all partitions except 1991 & 1992
> I attached the dataset. Let me know if you need anything.
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