Optimize memory reallocations #11112
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This small PR optimizes memory allocations during
CommonRowPartitionercreation. In the current realization the memory forRowSetCollectionis allocated in each iteration. This PR allows to reuse the already allocated memory if possible.The update is the most beneficial for datasets with high-number of rows.
Here are the perf gains for execution on single- and 2-socket machines, each socket has 56 cores CPU. HT is not used.