pgaref commented on a change in pull request #1147:
URL: https://github.com/apache/hive/pull/1147#discussion_r459307547
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/CommonJoinOperator.java
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@@ -523,11 +533,19 @@ private boolean createForwardJoinObject(boolean[] skip)
throws HiveException {
forward = true;
}
}
+ return forward;
+ }
+
+ // returns whether a record was forwarded
+ private boolean createForwardJoinObject(boolean[] skip, boolean antiJoin)
throws HiveException {
+ boolean forward = fillFwdCache(skip);
if (forward) {
if (needsPostEvaluation) {
forward = !JoinUtil.isFiltered(forwardCache, residualJoinFilters,
residualJoinFiltersOIs);
}
- if (forward) {
+
+ // For anti join, check all right side and if nothing is matched then
only forward.
Review comment:
Ok makes sense now -- so maybe we should just mention that for anti-join
we dont forward at this point
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