Commits on May 18, 2021

1. colexec: implement vectorized ntile window function …

   This patch implements the `ntile` window function in the vectorized
   engine. `ntile` takes in an integer argument `num_buckets` and then
   distributes all rows in a partition equally between the buckets,
   outputting the bucket number for each row.
   
   In the vectorized implementation, batches are buffered until the end
   of a partition is reached, at which point the `ntile` bucket values can
   be calculated. The batches are emitted in a streaming fashion; as soon
   as a batch is fully processed, it is returned and work is paused until
   the next call to `Next()`.
   
   See cockroachdb#37035
   
   Release note (sql change): the vectorized engine now supports the ntile
   window function.

   

   Drew Kimball authored and DrewKimball committed May 18, 2021
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