Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/207#discussion_r43472119
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/FunctionGenerationHelper.java
---
@@ -127,7 +133,7 @@ protected static boolean isComparableType(MajorType
type) {
private static String formatCanNotCompareMsg(MajorType left, MajorType
right) {
StringBuilder sb = new StringBuilder();
- sb.append("Map, Array or repeated scalar type should not be used in
group by, order by or in a comparison operator. Drill does not support compare
between ");
+ sb.append("Map, Array, Union or repeated scalar type should not be
used in group by, order by or in a comparison operator. Drill does not support
compare between ");
--- End diff --
Union here seems like a problem. The two values could very much be
comparable. Shouldn't this just be a reasonably large case statement?
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