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Posted to dev@flink.apache.org by "xuyangzhong (Jira)" <ji...@apache.org> on 2021/10/09 09:48:00 UTC

[jira] [Created] (FLINK-24492) incorrect implicit type conversion between numeric and (var)char

xuyangzhong created FLINK-24492:
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             Summary: incorrect implicit type conversion between numeric and (var)char
                 Key: FLINK-24492
                 URL: https://issues.apache.org/jira/browse/FLINK-24492
             Project: Flink
          Issue Type: Bug
            Reporter: xuyangzhong


The result of the sql "select 1 = '1'" is false. This is caused by the CodeGen. CodeGen  incorrectly transform this "=" to "BinaryStringData.equals (int 1)". And "<>" has the same wrong result.

In my opinion, "=" should have the same behavior with ">" and "<", which have the correct results. So before calcite solves this bug, we'd better temporarily forbidding this implicit type conversion in "=" and "<>".



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