okumin commented on a change in pull request #1531:
URL: https://github.com/apache/hive/pull/1531#discussion_r504422554
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File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java
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@@ -2961,10 +2961,11 @@ public Object process(Node nd, Stack<Node> stack,
NodeProcessorCtx procCtx,
final Statistics selectStats =
parents.get(LateralViewJoinOperator.SELECT_TAG).getStatistics();
final Statistics udtfStats =
parents.get(LateralViewJoinOperator.UDTF_TAG).getStatistics();
- final double factor = (double) udtfStats.getNumRows() / (double)
selectStats.getNumRows();
+ final long udtfNumRows = Math.max(udtfStats.getNumRows(), 1);
+ final double factor = (double) udtfNumRows / (double)
Math.max(selectStats.getNumRows(), 1);
Review comment:
`factor` will be greater than 0.0 and must not 0 or infinity.
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