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Posted to dev@flink.apache.org by "Dawid Wysakowicz (JIRA)" <ji...@apache.org> on 2018/12/18 14:37:00 UTC

[jira] [Created] (FLINK-11191) Exception in code generation when ambiguous columns in MATCH_RECOGNIZE

Dawid Wysakowicz created FLINK-11191:
----------------------------------------

             Summary: Exception in code generation when ambiguous columns in MATCH_RECOGNIZE
                 Key: FLINK-11191
                 URL: https://issues.apache.org/jira/browse/FLINK-11191
             Project: Flink
          Issue Type: Bug
          Components: Table API &amp; SQL
    Affects Versions: 1.7.0, 1.8.0
            Reporter: Dawid Wysakowicz
            Assignee: Dawid Wysakowicz


Query:
{code}
SELECT *
FROM Ticker
MATCH_RECOGNIZE (
  PARTITION BY symbol, price
  ORDER BY proctime
  MEASURES
    A.symbol AS symbol,
    A.price AS price
  PATTERN (A)
  DEFINE
    A AS symbol = 'a'
) AS T
{code}

throws a cryptic exception from the code generation stack that the output arity is wrong. We should add early validation and throw a meaningful exception. 

I've also created a calcite ticket to fix it on calcite's side: [CALCITE-2747]



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