[SPARK-22285] [SQL] Change implementation of ApproxCountDistinctForIntervals to TypedImperativeAggregate#19506

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wzhfy wants to merge 10 commits intoapache:masterfrom

wzhfy:change_forIntervals_typedAgg

Commits on Oct 13, 2017

implement ApproxCountDistinctForIntervals as TypedImperativeAggregate
Zhenhua Wang
committed

Commits on Oct 14, 2017

remove offset
Zhenhua Wang
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Commits on Oct 16, 2017

fix withOffset return type
Zhenhua Wang
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add test for large number of endpoints
Zhenhua Wang
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Commits on Oct 20, 2017

merge master
Zhenhua Wang
committed
simplify by creating LongArrayInternalRow
Zhenhua Wang
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Revert "merge master"
Zhenhua Wang
committed

Commits on Oct 21, 2017

use unsafe writing
Zhenhua Wang
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add serde test case
Zhenhua Wang
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Commits on Oct 23, 2017

use while loop
Zhenhua Wang
committed