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Caican Cai edited comment on CALCITE-6440 at 6/18/24 4:14 PM: -------------------------------------------------------------- The rule before SortRemoveConstantKeys optimization is {code:java} LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8]) LogicalSort(sort0=[$9], dir0=[ASC]) LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], EXPR$9=[null:NULL]) LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code} after {code:java} 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], EXPR$9=[null:NULL]) LogicalTableScan(table=[[CATALOG, SALES, EMP]]){code} But I think it can be optimized like this {code:java} LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8]) LogicalTableScan(table=[[CATALOG, SALES, EMP]]){code} What do you think?[~julianhyde] I can reopen this jira case was (Author: JIRAUSER302115): The rule before SortRemoveConstantKeys optimization is {code:java} LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8]) LogicalSort(sort0=[$9], dir0=[ASC]) LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], EXPR$9=[null:NULL]) LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code} after {code:java} 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], EXPR$9=[null:NULL]) LogicalTableScan(table=[[CATALOG, SALES, EMP]]){code} But I think it can be optimized like this {code:java} LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8]) LogicalTableScan(table=[[CATALOG, SALES, EMP]]){code} What do you think?[~julianhyde] > Add optimization to returns empty when The Order By parameter in the Sort > operator is empty > ------------------------------------------------------------------------------------------- > > Key: CALCITE-6440 > URL: https://issues.apache.org/jira/browse/CALCITE-6440 > Project: Calcite > Issue Type: New Feature > Components: core > Affects Versions: 1.37.0 > Reporter: Caican Cai > Priority: Major > Labels: pull-request-available > Fix For: 1.38.0 > > > For the following SQL: > {code:java} > select * from task order by null; {code} > We could rewrite it to: > {code:java} > select * from task;{code} -- This message was sent by Atlassian Jira (v8.20.10#820010)