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ENH: Reduction to get the first non-null value in a column #1230

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cpcloud opened this Issue Nov 22, 2017 · 1 comment

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cpcloud commented Nov 22, 2017

Some of the big SQL engines have explicit support for this.

  • Presto: ARBITRARY
  • Clickhouse: any/anyLast
  • BigQuery: ANY_VALUE

There are probably others that support this behavior.

Let's start with arbitrary and we can see about adding a string option 'first' or 'last' or another method arbitrary_last for backends that don't explicitly support it possibly using window functions.

@cpcloud cpcloud added the enhancement label Nov 22, 2017

@cpcloud cpcloud added this to the 0.13 milestone Nov 22, 2017

cpcloud added a commit that referenced this issue Feb 9, 2018

Arbitrary operation
Relates to #1230

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #1309 from kszucs/arbitrary and squashes the following commits:

427e82c [Krisztián Szűcs] document heavy modifier of arbitrary
45d2db0 [Krisztián Szűcs] review issues
bd53ece [Krisztián Szűcs] test arbitrary arguments
4aea76c [Krisztián Szűcs] arbitrary how argument; clickhouse and pandas implementation
e2d9883 [Krisztián Szűcs] revert expr api
672c053 [Krisztián Szűcs] arbitrary operation
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cpcloud commented Feb 14, 2018

Added in #1309

@cpcloud cpcloud closed this Feb 14, 2018

New Operations and Types automation moved this from To do to Done Feb 14, 2018

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