pengzhiwei created CALCITE-2620: ----------------------------------- 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)" -- This message was sent by Atlassian JIRA (v7.6.3#76005)