ddl: refine pre-split region logic (#11794) #11797
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cherry-pick #11794 to release-2.1
What problem does this PR solve?
The original logic of
pre_split_regionwill split 2^(pre_split_region -1) regions. It was strange for the user to understand and remember it.This PR will simply split 2^(
pre_split_region) regions whencreate tablewithpre_split_region.What is changed and how it works?
Check List
Tests
Code changes
Side effects
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Release Note
pre_split_regionslogic for easy to understand and remember.