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https://issues.apache.org/jira/browse/CALCITE-2993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-2993:
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Labels: pull-request-available (was: )
> 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
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.20.0
>
>
> In some cases, ParseException is thrown incorrectly:
> Case 1
> {code:sql}
> select lead(x) ignore from t -- "ignore" aliases "lead(x)"
> {code}
> Case 2
> {code:sql}
> select *
> from t match_recognize
> (
> after match skip to last -- "last" is a identifier. This is the implicit
> form of "skip to last 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 -- "key"/"value" are both column names.
> {code}
> And the failure on Case 1 is introduced by the fix of CALCITE-2847, Case 2/3
> are not.
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