kasakrisz commented on code in PR #6901:
URL: https://github.com/apache/hive/pull/6901#discussion_r4345080891
##########
common/src/java/org/apache/hadoop/hive/conf/HiveConf.java:
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@@ -2871,10 +2874,20 @@ public static enum ConfVars {
"uses column statistics to estimate the number of rows flowing out of
it and hence the data size.\n" +
"In the absence of column statistics, this factor determines the
amount of rows that flows out\n" +
"of JOIN operator."),
+ /**
+ * @deprecated Use {@link
HiveConf.ConfVars#HIVE_STATS_MULTI_KEY_JOINS_INDEPENDENCE_FACTOR}
+ */
+ @Deprecated
HIVE_STATS_CORRELATED_MULTI_KEY_JOINS("hive.stats.correlated.multi.key.joins",
true,
- "When estimating output rows for a join involving multiple columns,
the default behavior assumes" +
- "the columns are independent. Setting this flag to true will cause the
estimator to assume" +
- "the columns are correlated."),
+ "Deprecated: use hive.stats.multi.key.joins.independence.factor.
Setting this flag to false makes the\n" +
+ "physical planner estimate the output rows of a join on several keys
with the independence factor 0.5."),
+ HIVE_STATS_MULTI_KEY_JOINS_INDEPENDENCE_FACTOR("hive.stats.multi.key.joins
.independence.factor", 0.25f,
Review Comment:
Fixed
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