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https://issues.apache.org/jira/browse/CALCITE-5206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17564663#comment-17564663
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Julian Hyde commented on CALCITE-5206:
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I'm already working on a fix. Sorry I forgot to mark the bug 'in progress'.
Your proposed fix is similar to what I implemented.
> Parser allows MERGE with mismatched parentheses
> -----------------------------------------------
>
> Key: CALCITE-5206
> URL: https://issues.apache.org/jira/browse/CALCITE-5206
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> The SQL parser allows invalid MERGE statements with mismatched parentheses.
> For example, the following invalid statement is treated as valid but is
> missing a trailing ')':
> {code}
> merge into emps as e
> using temps as t on e.empno = t.empno
> when not matched
> then insert (a, b) (values (1, 2);
> {code}
> And the following invalid statement is treated as valid but has an unmatched
> trailing ')':
> {code}
> merge into emps as e
> using temps as t on e.empno = t.empno
> when not matched
> then insert (a, b) values (1, 2));
> {code}
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