EmmyMiao87 commented on a change in pull request #8695:
URL: https://github.com/apache/incubator-doris/pull/8695#discussion_r836226913
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File path:
fe/fe-core/src/main/java/org/apache/doris/planner/JoinCostEvaluation.java
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@@ -147,7 +149,7 @@ public long constructHashTableSpace() {
Math.pow(1.5, (int) ((Math.log((double)
rhsTreeCardinality/4096) / Math.log(1.5)) + 1)) * 4096;
double nodeOverheadSpace = nodeArrayLen * 16;
double nodeTuplePointerSpace = nodeArrayLen * rhsTreeTupleIdNum * 8;
- return Math.round((bucketPointerSpace + (double) rhsTreeCardinality *
rhsTreeAvgRowSize
+ return Math.round((bucketPointerSpace + (double) rhsTreeCardinality *
rhsTreeAvgRowSize * COMPRESSION_RATIO
Review comment:
Currently the average size of each row is indeed calculated using the
compressed data. But simply multiplying by a fixed compression ratio is
certainly inaccurate.
Or can you use the actual test data to cite the test data that the
compression ratio here will be more closely related to the actual memory
consumption after multiplying by 5?
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