GitHub user kiszk opened a pull request:
https://github.com/apache/spark/pull/21031
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[SPARK-23923][SQL] Add cardinality function
## What changes were proposed in this pull request?
The PR adds the SQL function `cardinality`. The behavior of the function is
based on Presto's one.
The function returns the length of the array or map stored in the column as
`BigInt`.
## How was this patch tested?
Added UTs
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kiszk/spark SPARK-23923
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21031.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #21031
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commit 89458544b564097f2fa6d34ae654c86f155410df
Author: Kazuaki Ishizaki <ishizaki@...>
Date: 2018-04-10T16:52:36Z
initial commit
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