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https://issues.apache.org/jira/browse/CALCITE-7466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18072813#comment-18072813
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Sergey Nuyanzin commented on CALCITE-7466:
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Merged as [5bf40d5dc64cbb2d875737d1e1ebcc699ad73abc|
https://github.com/apache/calcite/commit/5bf40d5dc64cbb2d875737d1e1ebcc699ad73abc]
> Unparse of MATCH_RECOGNIZE produces duplicate aliases
> -----------------------------------------------------
>
> Key: CALCITE-7466
> URL: https://issues.apache.org/jira/browse/CALCITE-7466
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Labels: pull-request-available
>
> Could be reproduced with any {{MATCH_RECOGNIZE}} query
> for instance
> {code:sql}
> SELECT *
> FROM emp
> MATCH_RECOGNIZE (
> MEASURES
> FINAL COUNT(A.deptno) AS deptno
> PATTERN (A B)
> DEFINE
> A AS A.empno = 123
> ) AS T
> {code}
> is being rewritten to
> {code:sql}
> SELECT *
> FROM `EMP` MATCH_RECOGNIZE(
> MEASURES FINAL COUNT(`A`.`DEPTNO`) AS `DEPTNO` AS `DEPTNO`
> PATTERN (`A` `B`)
> DEFINE `A` AS (PREV(`A`.`EMPNO`, 0) = 123 AS `A`)) AS `T`
> {code}
> where {{AS `DEPTNO` AS `DEPTNO`}} is duplicated
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