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https://issues.apache.org/jira/browse/HIVE-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Li updated HIVE-5831:
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Description:
When the users query a bucketed table and use the bucketed column in the
predicate, only the buckets that satisfy the predicate need to be scanned, thus
improving the performance.
Given a table test:
CREATE TABLE test (x INT, y STRING) CLUSTERED BY ( x ) INTO 10 BUCKETS;
The following query only has to scan bucket 5:
SELECT * FROM test WHERE x=5;
was:
When the users query a bucketed table and use the bucketed column in the
predicate, only the buckets that satisfy the predicate need to be scanned, thus
improving the performance.
Given a table test:
CREATE TABLE test (x INT, y STRING) CLUSTERED BY (x) INTO 10 BUCKETS;
The following query only has to scan bucket 5:
SELECT * FROM test WHERE x=5;
> filter input files for bucketed tables
> --------------------------------------
>
> Key: HIVE-5831
> URL: https://issues.apache.org/jira/browse/HIVE-5831
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Rui Li
>
> When the users query a bucketed table and use the bucketed column in the
> predicate, only the buckets that satisfy the predicate need to be scanned,
> thus improving the performance.
> Given a table test:
> CREATE TABLE test (x INT, y STRING) CLUSTERED BY ( x ) INTO 10 BUCKETS;
> The following query only has to scan bucket 5:
> SELECT * FROM test WHERE x=5;
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