Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/406#discussion_r55422075
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java
---
@@ -103,6 +104,10 @@ public void onMatch(RelOptRuleCall call) {
return;
}
+ if (proj != null && !ProjectRemoveRule.isTrivial(proj)) {
--- End diff --
We have a check whether the input to count() is nullable in Line 115. In
theory, if the input is non-nullable, then count(non-nullalbe expression) =
rowcount.
My guess is that the query (case expression) with incorrect result is
caused by the wrong type resolution for the case expression.
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