[
https://issues.apache.org/jira/browse/CALCITE-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sergey Nuyanzin updated CALCITE-7734:
-------------------------------------
Description:
An unqualified {{MEASURES}}/{{DEFINE}} column is expanded to {{<table>.<col>}},
so the pattern-variable alpha becomes the table name (e.g. {{LAST(emps.$4)}})
instead of the universal row pattern variable * ({{LAST(*.$4)}}). A table name
is not
a pattern variable, so the plan cannot be implemented.
for instance
{code:sql}
SELECT * FROM "hr"."emps" match_recognize (
ORDER BY "empid" DESC
MEASURES "commission" AS c
PATTERN (s up)
DEFINE up AS "commission" < prev("commission"))
{code}
produces plan containing
{{LAST(emps.$4, ...)}} instead of {{LAST(*.$4, ...)}}
seems to be a regression after CALCITE-7480
was:
An unqualified {{MEASURES}}/{{DEFINE}} column is expanded to {{<table>.<col>}},
so the pattern-variable alpha becomes the table name (e.g. {{LAST(emps.$4)}})
instead of the universal row pattern variable * ({{LAST(*.$4)}}). A table name
is not
a pattern variable, so the plan cannot be implemented.
for instance
{code:sql}
SELECT * FROM "hr"."emps" match_recognize (
ORDER BY "empid" DESC
MEASURES "commission" AS c
PATTERN (s up)
DEFINE up AS "commission" < prev("commission"))
{code}
produces plan containing
{{LAST(emps.$4, ...)}} instead of {{LAST(*.$4, ...)}}
> MATCH_RECOGNIZE with an unqualified column in MEASURES/DEFINE produces an
> unusable plan
> ---------------------------------------------------------------------------------------
>
> Key: CALCITE-7734
> URL: https://issues.apache.org/jira/browse/CALCITE-7734
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
>
> An unqualified {{MEASURES}}/{{DEFINE}} column is expanded to
> {{<table>.<col>}}, so the pattern-variable alpha becomes the table name (e.g.
> {{LAST(emps.$4)}}) instead of the universal row pattern variable *
> ({{LAST(*.$4)}}). A table name is not
> a pattern variable, so the plan cannot be implemented.
> for instance
> {code:sql}
> SELECT * FROM "hr"."emps" match_recognize (
> ORDER BY "empid" DESC
> MEASURES "commission" AS c
> PATTERN (s up)
> DEFINE up AS "commission" < prev("commission"))
> {code}
> produces plan containing
> {{LAST(emps.$4, ...)}} instead of {{LAST(*.$4, ...)}}
> seems to be a regression after CALCITE-7480
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
