jcamachor commented on a change in pull request #1553:
URL: https://github.com/apache/hive/pull/1553#discussion_r508220345
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/SharedWorkOptimizer.java
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@@ -284,6 +304,54 @@ public ParseContext transform(ParseContext pctx) throws
SemanticException {
return pctx;
}
+ /** SharedWorkOptimization strategy modes */
+ public enum Mode {
+ /**
+ * Merges two identical subtrees.
+ */
+ SubtreeMerge,
+ /**
+ * Merges a filtered scan into a non-filtered scan.
+ *
+ * In case we are already scanning the whole table - we should not scan it
twice.
+ */
+ RemoveSemijoin,
+ /**
+ * Fuses two filtered table scans into a single one.
+ *
+ * Dynamic filter subtree is kept on both sides - but the table is onlt
scanned once.
Review comment:
typo. onlt
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