mocktikv: avoid sorting multiple times with unstable order (#15898) #16199
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cherry-pick #15898 to release-3.0
What problem does this PR solve?
Issue Number: close #15767
Problem Summary:
The all tuples in TopN doesn't to be sorted multiple times but resulting into unstable order, so Next() does not fetch all tuples in the same order.
What is changed and how it works?
after all tuples from its child are fetched, sort them immedrately. Then fetch data from the ordered data.
Proposal: xxx
What's Changed:
How it Works:
Related changes
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Tests
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