sampling does not use internal column name
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Key: HIVE-108
URL: https://issues.apache.org/jira/browse/HIVE-108
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Reporter: Namit Jain
Assignee: Namit Jain
sampling does not use internal column name, it uses column table name instead -
which will not work in case there is any operator between table
scan and sampling, which is possible with column pruning.
The following test breaks:
(assuming srcbucket has more than 1 column: in this case 2 columns: key and
value)
-- no input pruning, sample filter
EXPLAIN
SELECT s.key
FROM srcbucket TABLESAMPLE (BUCKET 1 OUT OF 5 on key) s;
SELECT s.key
FROM srcbucket TABLESAMPLE (BUCKET 1 OUT OF 5 on key) s;
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