colexec: materialize whole vectors at once
Previously, the materializer would perform the conversion one row at a time, one column at a time. This commit refactors the conversion method so that it converts the desired number of elements at once and introduces a helper that can convert the whole batches. The helper is now used by the materializer and the default builtin operator. Release note: None
Showing with 464 additions and 167 deletions
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