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https://issues.apache.org/jira/browse/CALCITE-7474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-7474:
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Labels: pull-request-available (was: )
> LAST in MATCH_RECOGNIZE might return wrong result
> -------------------------------------------------
>
> Key: CALCITE-7474
> URL: https://issues.apache.org/jira/browse/CALCITE-7474
> Project: Calcite
> Issue Type: Bug
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Labels: pull-request-available
>
> depending on expanded or non-expanded column name the result is different
> for instance
> {code:sql}
> select *
> from "hr"."emps" match_recognize (
> order by "empid" desc
> measures "commission" as c,
> LAST("empid") as empid
> pattern (s up)
> define up as up."commission" < prev(up."commission"));
> {code}
> returns
> {noformat}
> C EMPID
> ---- -----
> 1000 100
> 500 200
> {noformat}
> now if use expanded name like {{LAST("hr"."emps"."empid") as empid}} instead
> of {{LAST("empid") as empid}}
> {code:sql}
> select *
> from "hr"."emps" match_recognize (
> order by "empid" desc
> measures "commission" as c,
> LAST("hr"."emps"."empid") as empid
> pattern (s up)
> define up as up."commission" < prev(up."commission"));
> {code}
> returns
> {noformat}
> C
> ----
> 1000
> 500
> {noformat}
> the reason is
> https://github.com/apache/calcite/blob/0ce0c5ae2f7055f13551ebcde8e1aaa2ff17b469/core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java#L4184-L4196
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