Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/462#discussion_r58730151
--- Diff:
exec/java-exec/src/main/codegen/templates/ComparisonFunctions.java ---
@@ -215,6 +192,36 @@ public void eval() {
}
}
+ <#-- IS_DISTINCT_FROM function -->
+ @FunctionTemplate(names = {"is_distinct_from", "is distinct from" },
--- End diff --
@vkorukanti, I want to clarify...if the query only had a join condition
with IS_NOT_DISTINCT_FROM, I would think it should work just with your
convertlet changes, since both HashJoin and MergeJoin handle this type of join
condition. Is the reason you had to implement the full comparator codegen to
handle more general types of comparisons ? e.g in the SELECT list if I say
'SELECT a IS NOT DISTINCT FROM b' ? Suppose we had a convertlet that only
preserved the IS (NOT) DISTINCT FROM join condition, and defaulted to the
Calcite rewrite using the CASE expression, then we would not have to implement
the full comparator.
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