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Which issue does this PR close?
chrto use bulk-NULL string builder #21846.Rationale for this change
Optimize
chrby avoiding per-row NULL bitmap maintenance, and also split the hot loop to avoid taking a branch when no NULL bitmap is given.Benchmarks:
What changes are included in this PR?
chrto reduce NULL-handling overheadAre these changes tested?
Yes.
Are there any user-facing changes?
No.