Sergey Nuyanzin created CALCITE-7467:
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Summary: MATCH_RECOGNIZE does not support aliases
Key: CALCITE-7467
URL: https://issues.apache.org/jira/browse/CALCITE-7467
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Sergey Nuyanzin
Assignee: Sergey Nuyanzin
The issue appears in case of {SqlValidator.Config#identifierExpansion == true}}
Simple query highlighting the issue
{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}
will be rewritten to
{code:sql}
SELECT `T`.`DEPTNO`
FROM `CATALOG`.`SALES`.`EMP` AS `EMP` MATCH_RECOGNIZE(
MEASURES FINAL COUNT(`A`.`DEPTNO`) AS `DEPTNO`
PATTERN (`A` `B`)
DEFINE `A` AS (PREV(`A`.`EMPNO`, 0) = 123 AS `A`)) AS `T`
{code}
Now the result is unparsable as current parser can not parse tables with alias
before {{MATCH_RECOGNIZE}}.
The proposal is to add such ability
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