jcamachor commented on a change in pull request #831: HIVE-22238 pkfk
URL: https://github.com/apache/hive/pull/831#discussion_r341452795
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File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java
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@@ -2255,8 +2259,14 @@ private long getCardinality(List<Operator<? extends
OperatorDesc>> ops, Integer
Statistics parentStats = parent.getStatistics();
if (fkInd == pos) {
// 2.1 This is the new number of rows after PK is joining with FK
- newrows = (long) Math.ceil(parentStats.getNumRows() *
pkfkSelectivity);
+ if (isFkFiltered) {
+ // if the foregin key is filtered by some condition we may not
rescale it
Review comment:
typo: `foregin`
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