cmu-db / peloton / 6225

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Support limit, offset, top-k serial and parallel versions in codegen (#1435)

* Initial limit commit

* Cleanup OrderByPlan

* Don't use SQL types for the result of the comparison when sorting

* Sorting for Top-K works. Probably slow.

* Optimize pop-then-push into single operation

* Fix lang::If to allow injection of custom then and else blocks

* Added early exit block to consumer context to allow operators to quick exit

* More comments

* Fast-exit limits

* Cleanup comments. Enabled parallel sorting.

* Fixed bytecode compilation. Added explicit call handlers for sorter to bytecode builder. Fixed parallel sorting top-k

* Set limit and offset to 0 when no limit/offset provided

* Fix offset

* Fix sort test in optimize to have well-defined order (some sort values were equal producing non-deterministic outputs). Fixed order by translator test to push a limit plan on top. This wasn't there before because we didn't need a limit

* Cleanup

* Fix limit without order-by clause

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