bug: Fix memory reservation and allocation problems for SortExec#14644

Merged

comphead merged 3 commits intoapache:mainfrom

Kontinuation:pr-fix-sort-mem-reservation-and-usage

Feb 18, 2025

Commits on Feb 13, 2025

Fix double memory allocation caused by collecting the merged batches;
Kontinuation
committed

Commits on Feb 14, 2025

Don't reserve additional memory for merging after fetching the first mergd batch
Kontinuation
committed

Commits on Feb 16, 2025

Address review comments
Kontinuation
committed