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https://issues.apache.org/jira/browse/SPARK-21117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853736#comment-16853736
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Yuming Wang commented on SPARK-21117:
-------------------------------------
PostgreSQL support this function:
||Function||Return Type||Description||Example||Result||
|width_bucket(operanddp, b1 dp, b2 dp, countint)|int|return the bucket number
to which operand would be assigned in a histogram having count equal-width
buckets spanning the range b1 to b2; returns 0 or count+1 for an input outside
the range|width_bucket(5.35, 0.024, 10.06, 5)|3|
|width_bucket(operandnumeric, b1 numeric, b2numeric, count int)|int|return the
bucket number to which operand would be assigned in a histogram having count
equal-width buckets spanning the range b1 to b2; returns 0 or count+1 for an
input outside the range|width_bucket(5.35, 0.024, 10.06, 5)|3|
|width_bucket(operandanyelement, thresholdsanyarray)|int|return the bucket
number to which operand would be assigned given an array listing the lower
bounds of the buckets; returns 0 for an input less than the first lower bound;
the thresholds array must be sorted, smallest first, or unexpected results will
be obtained|width_bucket(now(), array['yesterday', 'today',
'tomorrow']::timestamptz[])|2|
[https://www.postgresql.org/docs/11/functions-math.html]
> Built-in SQL Function Support - WIDTH_BUCKET
> --------------------------------------------
>
> Key: SPARK-21117
> URL: https://issues.apache.org/jira/browse/SPARK-21117
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Yuming Wang
> Priority: Major
> Labels: bulk-closed
>
> For a given expression, the {{WIDTH_BUCKET}} function returns the bucket
> number into which the value of this expression would fall after being
> evaluated.
> {code:sql}
> WIDTH_BUCKET (expr , min_value , max_value , num_buckets)
> {code}
> Ref:
> https://docs.oracle.com/cd/B28359_01/olap.111/b28126/dml_functions_2137.htm#OLADM717
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