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Posted to issues@calcite.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2017/06/20 10:14:00 UTC
[jira] [Comment Edited] (CALCITE-1852) Fix for UnionMergeRule to
deal correctly with EXCEPT
[ https://issues.apache.org/jira/browse/CALCITE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16055501#comment-16055501 ]
Jesus Camacho Rodriguez edited comment on CALCITE-1852 at 6/20/17 10:13 AM:
----------------------------------------------------------------------------
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/f63a65a .
was (Author: jcamachorodriguez):
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/7cdf4d0 .
> Fix for UnionMergeRule to deal correctly with EXCEPT
> ----------------------------------------------------
>
> Key: CALCITE-1852
> URL: https://issues.apache.org/jira/browse/CALCITE-1852
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.13.0
>
>
> EXCEPT might be merged by the rule even when we should not, mingling the different branches.
> For instance, given the following query:
> {code:sql}
> select * from (
> select name, deptno from
> (
> select name, deptno, count(1) from dept group by name, deptno
> except all
> select name, deptno, 1 from dept
> ) subq
> except all
> select name, deptno from
> (
> select name, deptno, 1 from dept
> except all
> select name, deptno, count(1) from dept group by name, deptno
> ) subq2
> ) a
> except all
> select name, deptno from dept
> ) aa
> {code}
> The plan produced by the rule is:
> {code}
> LogicalMinus(all=[true])
> LogicalProject(NAME=[$0], DEPTNO=[$1])
> LogicalAggregate(group=[{0, 1}], EXPR$2=[COUNT()])
> LogicalProject(NAME=[$1], DEPTNO=[$0], $f2=[1])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalProject(NAME=[$0], DEPTNO=[$1])
> LogicalProject(NAME=[$1], DEPTNO=[$0], EXPR$2=[1])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalProject(NAME=[$0], DEPTNO=[$1])
> LogicalAggregate(group=[{0, 1}], EXPR$2=[COUNT()])
> LogicalProject(NAME=[$1], DEPTNO=[$0], $f2=[1])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalProject(NAME=[$0], DEPTNO=[$1])
> LogicalProject(NAME=[$1], DEPTNO=[$0], EXPR$2=[1])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalProject(NAME=[$1], DEPTNO=[$0])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> {code}
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