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https://issues.apache.org/jira/browse/CALCITE-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283937#comment-15283937
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Emmanuel Bastien commented on CALCITE-1238:
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I'll submit a PR later today, including the additional test cases you mentioned
on the mailing list.
> Unparsing LIMIT without ORDER BY generates invalid SQL after validation
> -----------------------------------------------------------------------
>
> Key: CALCITE-1238
> URL: https://issues.apache.org/jira/browse/CALCITE-1238
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.7.0
> Reporter: Emmanuel Bastien
> Assignee: Emmanuel Bastien
>
> The context of the problem is the validation of queries with a LIMIT clause
> but no ORDER BY, e.g. "SELECT c FROM t LIMIT 2".
> The problem does not show up at parsing time but when running a validator.
> The generated AST includes an ORDER BY operand with an empty column list.
> When building a SQL query out of the validated AST, an ORDER BY clause is
> inserted before the LIMIT/FETCH clause, e.g "SELECT c FROM t ORDER BY LIMIT
> 2". This SQL query is not valid.
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