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https://issues.apache.org/jira/browse/CALCITE-5680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17717894#comment-17717894
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Benchao Li commented on CALCITE-5680:
-------------------------------------
This is similar to CALCITE-5655, I've added it's link to this.
> Wrong plan for multiple IN sub-queries with only literal operands
> -----------------------------------------------------------------
>
> Key: CALCITE-5680
> URL: https://issues.apache.org/jira/browse/CALCITE-5680
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: Runkang He
> Assignee: Runkang He
> Priority: Major
> Labels: pull-request-available
>
> When the query contains multiple IN sub-queries with only literal operands,
> and connected with OR predicate in WHERE clause, the result is wrong. The
> minimal reproducer is below:
> SQL:
> {code:sql}
> select empno from sales.empnullables
> where 1 in (
> select deptno from sales.deptnullables where name = 'dept1')
> or 2 in (
> select deptno from sales.deptnullables where name = 'dept2')
> {code}
> The Plan generated by calcite master branch: (Notice the bold part of IS
> NULL(*$2*) in the downstream LogicalFilter)
> {code:sql}
> LogicalProject(EMPNO=[$0])
> LogicalFilter(condition=[OR(CASE(IS NULL($2), false, =($1, false),
> null:BOOLEAN, IS NOT NULL($1), true, false), CASE(IS NULL(*$2*), false, =($1,
> false), null:BOOLEAN, IS NOT NULL($1), true, false))])
> LogicalJoin(condition=[true], joinType=[left])
> LogicalJoin(condition=[true], joinType=[left])
> LogicalProject(EMPNO=[$0])
> LogicalTableScan(table=[[CATALOG, SALES, EMPNULLABLES]])
> LogicalSort(sort0=[$0], dir0=[DESC], fetch=[1])
> LogicalAggregate(group=[{0}], c=[COUNT()])
> LogicalProject(cs=[IS NOT NULL($0)])
> LogicalFilter(condition=[OR(=(1, $0), IS NULL($0))])
> LogicalProject(DEPTNO=[$0])
> LogicalFilter(condition=[=($1, 'dept1')])
> LogicalTableScan(table=[[CATALOG, SALES, DEPTNULLABLES]])
> LogicalSort(sort0=[$0], dir0=[DESC], fetch=[1])
> LogicalAggregate(group=[{0}], c=[COUNT()])
> LogicalProject(cs=[IS NOT NULL($0)])
> LogicalFilter(condition=[OR(=(2, $0), IS NULL($0))])
> LogicalProject(DEPTNO=[$0])
> LogicalFilter(condition=[=($1, 'dept2')])
> LogicalTableScan(table=[[CATALOG, SALES, DEPTNULLABLES]])
> {code}
> The wrong part is that when build the downstream LogicalFilter for the two
> sub-queries, the filter for the second sub-query is CASE(IS NULL($2), false,
> =($1, false), null:BOOLEAN, IS NOT NULL($1), true, false), notice that *$2
> should be the second sub-query's intermediate table field dt.c(which field
> index is $4), and $1 should be the second sub-query's intermediate table
> field dt.cs(which field index is $3), but now the actual reference is the
> first sub-query's, this leads to wrong plan, and wrong result*.
> The root cause is that intermediate table alias is the same as the previous
> sub-query's, but when lookup intermediate table field, it always returns the
> previous one which is not belong to the current subquery.
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