TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning as regression
of HIVE-1538
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Key: HIVE-2451
URL: https://issues.apache.org/jira/browse/HIVE-2451
Project: Hive
Issue Type: Bug
Reporter: Siying Dong
Assignee: Siying Dong
Example:
select count(1) from <bucket_table> TABLESAMPLE(BUCKET xxx out of yyy) where
<partition_column> = 'xxx'
will not trigger input pruning.
The reason is that we assume sample filtering operator only happens as the
second filter after table scan, which is broken by HIVE-1538, even if the
feature doesn't turn on.
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