[jira] [Created] (CALCITE-2993) ParseException may be thrown for legal SQL queries due to incorrect "LOOKAHEAD(1)" hints

["Hongze Zhang (JIRA)" <ji...@apache.org>]

Hongze Zhang created CALCITE-2993:
-------------------------------------

             Summary: ParseException may be thrown for legal SQL queries due to incorrect "LOOKAHEAD(1)" hints
                 Key: CALCITE-2993
                 URL: https://issues.apache.org/jira/browse/CALCITE-2993
             Project: Calcite
          Issue Type: Bug
            Reporter: Hongze Zhang
            Assignee: Hongze Zhang
             Fix For: 1.20.0


In some cases, ParseException is thrown incorrectly:

Case 1
{code:sql}
select lead(x) ignore from t
{code}

Case 2 
{code:sql}
select *
  from t match_recognize
  (
     after match skip to last
    pattern (strt down+ up+)
    define
      down as down.price < PREV(down.price),
      up as up.price > prev(up.price)
  ) mr
{code}

Case 3
{code:sql}
select json_object(key: value) from t
{code}

And the failure on Case 1 is introduced by the fix of CALCITE-2847, Case 2/3 are not.




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