[SPARK-32350][FOLLOW-UP] Fix count update issue and partition the value list to a set of small batches for LevelDB writeAll#29425

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baohe-zhang wants to merge 4 commits intoapache:masterfrom

baohe-zhang:SPARK-32350-FOLLOWUP

Commits on Aug 13, 2020

Partition value list to smaller batches
Baohe Zhang
committed

Commits on Aug 25, 2020

Add unit test for leveldb writeAll()
Baohe Zhang
committed
Fix bug when updating count in levelDB
Baohe Zhang
committed

Commits on Sep 1, 2020

Fix count update bug when calling writeAll
Baohe Zhang
committed