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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2019/03/19 08:54:07 UTC

[GitHub] [calcite] kgyrtkirk opened a new pull request #1116: [CALCITE-2929] Simplification of IS NULL checks are incorrectly assum…

kgyrtkirk opened a new pull request #1116: [CALCITE-2929] Simplification of IS NULL checks are incorrectly assum…
URL: https://github.com/apache/calcite/pull/1116
 
 
   …ing that CAST-s are possible
   
   * for non-nullable types the cast was discarded in case of an IS NULL check; so it might resulted in missing errors
     cast('invalid' as int) IS NULL
   * in case of non-nullable types; IS NULL have made the assumption that cast will not change its nullability (which is true); however it may raise an error - so it can't be removed.

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