jcamachor commented on a change in pull request #729: HIVE-22003
URL: https://github.com/apache/hive/pull/729#discussion_r306070882
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File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/SharedWorkOptimizer.java
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@@ -486,6 +510,75 @@ private static boolean
sharedWorkOptimization(ParseContext pctx, SharedWorkOptim
return mergedExecuted;
}
+ private static void replaceSemijoinExpressions(TableScanOperator tsOp,
List<ExprNodeDesc> semijoinExprNodes) {
Review comment:
We are merging the discardable TS into the retainable TS. We remove the SJ
expressions from the discardable TS since we are about to remove it from the
operator tree (we preserve the rest of filter expressions without SJ
expressions from this branch + the expressions with SJ coming from other branch
so we can add them to the Filter operator on top of the TS).
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