AssHero commented on code in PR #3578:
URL: https://github.com/apache/arrow-datafusion/pull/3578#discussion_r983020217
##########
datafusion/optimizer/src/filter_push_down.rs:
##########
@@ -248,6 +249,128 @@ fn get_pushable_join_predicates<'a>(
.unzip()
}
+// examine OR clause to see if any useful clauses can be extracted and push
down.
+// extract at least one qual of each sub clauses of OR clause, then form the
quals
+// to new OR clause as predicate.
+//
+// Filter: (a = c and a < 20) or (b = d and b > 10)
+// join/crossjoin:
+// TableScan: projection=[a, b]
+// TableScan: projection=[c, d]
+//
+// is optimized to
+//
+// Filter: (a = c and a < 20) or (b = d and b > 10)
+// join/crossjoin:
+// Filter: (a < 20) or (b > 10)
+// TableScan: projection=[a, b]
+// TableScan: projection=[c, d]
+fn extract_or_clauses_for_join(
Review Comment:
I'll add this comments later. Thanks!
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