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Danny Chen resolved CALCITE-3390. --------------------------------- Fix Version/s: 1.22.0 Resolution: Fixed Fixed in [a02155a|https://github.com/apache/calcite/commit/a02155a70a1fe98c8930a0060dc043902ebbd88f], thanks for your PR, [~amansinha100] ! > 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 > Priority: Major > Labels: pull-request-available > Fix For: 1.22.0 > > Time Spent: 6h 20m > Remaining Estimate: 0h > > 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 CALCITE-1753; > before that the ITEM was pushed on both sides of the Left Outer Join. -- This message was sent by Atlassian Jira (v8.3.4#803005)