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Posted to issues@calcite.apache.org by "pengzhiwei (JIRA)" <ji...@apache.org> on 2018/10/11 08:29:00 UTC
[jira] [Created] (CALCITE-2620) Simplify "coalesce(null,x)" to "x"
pengzhiwei created CALCITE-2620:
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Summary: Simplify "coalesce(null,x)" to "x"
Key: CALCITE-2620
URL: https://issues.apache.org/jira/browse/CALCITE-2620
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.18.0
Reporter: pengzhiwei
Assignee: Julian Hyde
"coalesce(x0,x1,.....)" can be simplified if any of "xi" is null literal.
e.g. "coalesce(null,x)" can simplify to "x", "coalesce(x,null,y)" can simplify to "coalesce(x,y)"
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