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https://issues.apache.org/jira/browse/CALCITE-3132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16866077#comment-16866077
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Vineet Garg commented on CALCITE-3132:
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[~hyuan] You are correct. Since this happens to be COUNT in this case we don't
really need <>($10,0)
> Simply expressions in LogicalFilter generated for subqueries with quantified
> predicate
> --------------------------------------------------------------------------------------
>
> Key: CALCITE-3132
> URL: https://issues.apache.org/jira/browse/CALCITE-3132
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Labels: sub-query
>
> Following test in RelOptRulesTest generate plan with LogicalFilter
> {code}
> @Test public void testSome() {
> final String sql = "select * from emp e1\n"
> + " where e1.empno > SOME (select deptno from dept)";
> checkSubQuery(sql).withLateDecorrelation(true).check();
> }
> {code}
> {code}
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
> LogicalFilter(condition=[OR(AND(IS TRUE(>($0, $9)), <>($10, 0)),
> AND(>($10, $11), null, <>($10, 0), IS NOT TRUE(>($0, $9))), AND(>($0, $9),
> <>($10, 0), IS NOT TRUE(>($0, $9)), <=($10, $11)))])
> LogicalJoin(condition=[true], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{}], m=[MIN($0)], c=[COUNT()], d=[COUNT($0)])
> LogicalProject(DEPTNO=[$0])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> {code}
> Note that LogicalFilter has condition which should be further simplified
> {code}
> (condition=[OR(AND(IS TRUE(>($0, $9)), <>($10, 0)), AND(>($10, $11), null,
> <>($10, 0), IS NOT TRUE(>($0, $9))), AND(>($0, $9), <>($10, 0), IS NOT
> TRUE(>($0, $9)), <=($10, $11)))])
> {code}
> If {{AND(IS TRUE(>($0, $9)), <>($10, 0))}} is true so will be {{AND(IS
> TRUE(>($0, $9)), <>($10, 0))}}
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