Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/207#discussion_r43471705
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/ExpressionTreeMaterializer.java
---
@@ -239,6 +261,10 @@ public LogicalExpression
visitFunctionCall(FunctionCall call, FunctionLookupCont
//replace with a new function call, since its argument could be
changed.
call = new FunctionCall(call.getName(), args, call.getPosition());
+// if (hasUnionInput(call)) {
--- End diff --
delete?
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