xiedeyantu commented on code in PR #4304:
URL: https://github.com/apache/calcite/pull/4304#discussion_r2043715417
##########
core/src/test/resources/org/apache/calcite/test/RelOptRulesTest.xml:
##########
@@ -18055,6 +18055,65 @@ LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2],
MGR=[$3], HIREDATE=[$4], SAL=[$
LogicalFilter(condition=[AND(<(+($0, 50), 20), >=($cor0.DEPTNO,
$9))])
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3],
HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], $f9=[+(30, $7)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
+]]>
+ </Resource>
+ </TestCase>
+ <TestCase name="testUnionEliminatorRule">
Review Comment:
> Have you ever tried to optimize the SQL by using PruneEmptyRule and
UnionEliminatorRule?
>
> ```
> select * from emp where deptno = 10
> union all
> select * from emp where 1=0
> ```
The following optimizations have been applied to this SQL query:
-- original plan
LogicalUnion(all=[true])
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalFilter(condition=[=($7, 10)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalFilter(condition=[=(1, 0)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
-- using CoreRules.FILTER_REDUCE_EXPRESSIONS
LogicalUnion(all=[true])
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalFilter(condition=[=($7, 10)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalValues(tuples=[[]])
-- using PruneEmptyRules.PROJECT_INSTANCE
LogicalUnion(all=[true])
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalFilter(condition=[=($7, 10)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
LogicalValues(tuples=[[]])
-- using PruneEmptyRules.UNION_INSTANCE
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalFilter(condition=[=($7, 10)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
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