add preAlloc method for reldata

Open badboynt1 opened this issue 1 year ago • 1 comments

What type of PR is this?

[ ] API-change
[ ] BUG
[x] Improvement
[ ] Documentation
[ ] Feature
[ ] Test and CI
[ ] Code Refactoring

Which issue(s) this PR fixes:

issue #19054

What this PR does / why we need it:

add preAlloc method for reldata fix a bug that cause count(*) optimization don't work

Oct 23 '24 06:10 badboynt1

跑一轮tpch，内存分配从4g降低到700mb

     .     4.20GB   4639:           err := shuffleBlocksByRange(c, relData, n, nodes)

     .   747.26MB   4639:           err := shuffleBlocksByRange(c, relData, n, nodes)

Oct 23 '24 06:10 badboynt1