[SPARK-23803][SQL] Support bucket pruning#20915

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sabanas wants to merge 12 commits intoapache:masterfrom

sabanas:filter-prune-buckets

Commits on Mar 23, 2018

add bucket pruning functionality
Asher Saban
committed
add composite filters test cases and refactor pruning test
Asher Saban
committed

Commits on Mar 26, 2018

remove redundant code and move shared getBucketId to BucketingUtils
Asher Saban
committed

Commits on Mar 27, 2018

fix variable name and add select buckets count to metadata
Asher Saban
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optimize imports
Asher Saban
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fix checkstyle errors
Asher Saban
committed

Commits on Mar 29, 2018

style guidelines
Asher Saban
committed

Commits on Mar 30, 2018

if all column are required, return BitSet with 1's instead of 0's.
Asher Saban
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use bucket numbers that don't generate empty buckets on df and nullDF
Asher Saban
committed

Commits on Jun 5, 2018

CR fixes
asaban
committed

Commits on Jun 6, 2018

calculate bucket num only once
asaban
committed
inline statement
asaban
committed