Aman Sinha created CALCITE-3390:
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Summary: ITEM expression does not get pushed to the right input of
left-outer-join
Key: CALCITE-3390
URL: https://issues.apache.org/jira/browse/CALCITE-3390
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.21.0
Reporter: Aman Sinha
Assignee: Aman Sinha
In the following query, the ITEM expression above the Left Outer Join does not
get pushed to the right input (null-preserving input) of the join whereas it
should since ITEM does not change the nullability.
{noformat}
explain plan without implementation for select tt7.columns[0], tt8.columns[0]
as x from tt7 left outer join tt8 on tt7.columns[0] = tt8.columns[0];
DrillScreenRel
DrillProjectRel(EXPR$0=[$1], x=[ITEM($2, 0)])
DrillJoinRel(condition=[=($0, $3)], joinType=[left])
DrillProjectRel($f2=[ITEM($0, 0)], ITEM=[ITEM($0, 0)])
DrillScanRel(table=[[dfs, tmp, tt7]], groupscan=[EasyGroupScan
[selectionRoot=file:/tmp/tt7, numFiles=1, columns=[`columns`[0]],
files=[file:/tmp/tt7/0_0_0.csv]]])
DrillProjectRel(columns=[$0], $f2=[ITEM($0, 0)])
DrillScanRel(table=[[dfs, tmp, tt8]], groupscan=[EasyGroupScan
[selectionRoot=file:/tmp/tt8, numFiles=1, columns=[`columns`, `columns`[0]],
files=[file:/tmp/tt8/0_0_0.csv]]])
{noformat}
>From what I can tell, the change in behavior occurred with
>https://issues.apache.org/jira/browse/CALCITE-1753 ; before that the ITEM was
>pushed on both sides of the Left Outer Join.
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