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https://issues.apache.org/jira/browse/CALCITE-895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Julian Hyde resolved CALCITE-895.
---------------------------------
Resolution: Fixed
Fix Version/s: 1.5.0-incubating
Fixed in
http://git-wip-us.apache.org/repos/asf/incubator-calcite/commit/2fa63dda
(thanks for the patch, [~seanhychu]!) and improved in
http://git-wip-us.apache.org/repos/asf/incubator-calcite/commit/d697ca16.
> Simplify "(CASE ... END) = constant" inside AND or OR
> -----------------------------------------------------
>
> Key: CALCITE-895
> URL: https://issues.apache.org/jira/browse/CALCITE-895
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Julian Hyde
> Fix For: 1.5.0-incubating
>
>
> ReduceExpressionsRule.FILTER_INSTANCE does not simplify a Filter, which has
> “Case-When IsNull” under OR or AND.
> For example, a query like this:
> {code}
> select *
> from emp
> where case when sal = 1000 then null else 1 end is null OR sal = 2000
> {code}
> The condition in the filter can be rewritten as "sal = 1000 OR sal = 2000".
> However, for now, Calcite does not do the simplification. Instead, Calcite
> output this plan:
> {code}
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
> LogicalFilter(condition=[OR(IS NULL(CASE(=($5, 1000), null, 1)), =($5,
> 2000))])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
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