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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