danny0405 commented on a change in pull request #1157: [CALCITE-2969] Improve design of join-like relational expressions URL: https://github.com/apache/calcite/pull/1157#discussion_r279149384
########## File path: core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableHashJoin.java ########## @@ -161,31 +142,48 @@ public static EnumerableJoin create( } else { rowCount += rightRowCount; } - return planner.getCostFactory().makeCost(rowCount, 0, 0); + if (isNonCorrelatedSemiJoin()) { + return planner.getCostFactory().makeCost(rowCount, 0, 0).multiplyBy(.01d); Review comment: I don't know the implementation details either, just copy it from EnumerableSemiJoin, the oldest commit about it is 2014 and seems just a code refactor, so i just keep it as before. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services