[jira] [Created] (FLINK-8387) Do not allow filter(false)

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-8387:
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             Summary: Do not allow filter(false)
                 Key: FLINK-8387
                 URL: https://issues.apache.org/jira/browse/FLINK-8387
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Timo Walther
            Assignee: Timo Walther


Code like the following looks correct but actually produces unintended side effects:

{code}
left.join(right)
  .where('a == 'd)
  .select('a)
{code}

{{==}} is not converted into an expression but directly evaluated into an boolean expression and implicitly converted into an {{false}} literal. Instead of an exception this leads to an always rejecting table program. We should not allow filters with {{false}} literals.



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