[jira] [Created] (CALCITE-1238) Unparsing LIMIT without ORDER BY generates invalid SQL after validation

["Emmanuel Bastien (JIRA)" <ji...@apache.org>]

Emmanuel Bastien created CALCITE-1238:
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             Summary: 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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