[SPARK-17072] [SQL] support table-level statistics generation and storing into/loading from metastore#14712

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wzhfy wants to merge 25 commits intoapache:masterfrom

wzhfy:tableStats

Commits on Aug 30, 2016

fix path
wangzhenhua
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refactor table statistics
wangzhenhua
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fix testcase after rebase
wangzhenhua
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recover path
wangzhenhua
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add comment
wangzhenhua
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use flatmap instead of if-else
wangzhenhua
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move alterTableStats logic to HiveExternalCatalog
wangzhenhua
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fix test case: set sizeInBytes in statistics of LogicalRelation no matter inheritedStats exists or not
wangzhenhua
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adding inheritedStats as a constructor parameter in LogicalRelation
wangzhenhua
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Revert "recover path"
wangzhenhua
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remove duplicated code
wangzhenhua
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simplify code
wangzhenhua
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create spark's own names for statistic properties
wangzhenhua
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need to clear the old (i.e. inaccurate) stats before alter stats
wangzhenhua
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Revert "fix path"
wangzhenhua
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fix compilation error for LogicalRelation
wangzhenhua
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fix scala style
wangzhenhua
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fix test case
wangzhenhua
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Commits on Aug 31, 2016

update based on comments
wangzhenhua
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fix import order
wangzhenhua
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refactor LogicalRelation
Zhenhua Wang
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Commits on Sep 1, 2016

remove unnecessary changes
wangzhenhua
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fix bug about size
wangzhenhua
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Commits on Sep 2, 2016

update based on comments
wangzhenhua
committed

Commits on Sep 3, 2016

add test cases
Zhenhua Wang
committed