Gautam Kumar Parai created DRILL-6093:
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Summary: 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: 1.12.0, 1.11.0
Reporter: Gautam Kumar Parai
Assignee: Gautam Kumar Parai
Fix For: 1.12.0
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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