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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-6093) Unneeded columns in Drill logical project
Date Wed, 24 Jan 2018 18:36:01 GMT

    [ https://issues.apache.org/jira/browse/DRILL-6093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338037#comment-16338037
] 

ASF GitHub Bot commented on DRILL-6093:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/drill/pull/1093


> Unneeded columns in Drill logical project
> -----------------------------------------
>
>                 Key: DRILL-6093
>                 URL: https://issues.apache.org/jira/browse/DRILL-6093
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.11.0, 1.12.0
>            Reporter: Gautam Kumar Parai
>            Assignee: Gautam Kumar Parai
>            Priority: Major
>              Labels: ready-to-commit
>             Fix For: 1.13.0
>
>
> Here is an example query with the corresponding logical plan. The project contains unnecessary
columns L_ORDERKEY, O_ORDERKEY in the projection even when it is not required by subsequent
operators e.g. DrillJoinRel.
> EXPLAIN PLAN without implementation FOR SELECT L.L_QUANTITY FROM cp.`tpch/lineitem.parquet`
L, cp.`tpch/orders.parquet` O WHERE cast(L.L_ORDERKEY as int) = cast(O.O_ORDERKEY as int);
> *+------+------+*
> *|* *text* *|* *json* *|*
> *+------+------+*
> *|* DrillScreenRel
>   DrillProjectRel(L_QUANTITY=[$1])
>     DrillJoinRel(condition=[=($2, $4)], joinType=[inner])
>       DrillProjectRel(L_ORDERKEY=[$0], L_QUANTITY=[$1], $f2=[CAST($0):INTEGER])
>         DrillScanRel(table=[[cp, tpch/lineitem.parquet]], groupscan=[ParquetGroupScan
[entries=[ReadEntryWithPath [path=classpath:/tpch/lineitem.parquet]], selectionRoot=classpath:/tpch/lineitem.parquet,
numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`L_ORDERKEY`, `L_QUANTITY`]]])
>       DrillProjectRel(O_ORDERKEY=[$0], $f1=[CAST($0):INTEGER])
>         DrillScanRel(table=[[cp, tpch/orders.parquet]], groupscan=[ParquetGroupScan
[entries=[ReadEntryWithPath [path=classpath:/tpch/orders.parquet]], selectionRoot=classpath:/tpch/orders.parquet,
numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`O_ORDERKEY`]]])



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