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https://issues.apache.org/jira/browse/SPARK-18000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhenhua Wang updated SPARK-18000:
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Description:
This function Computes frequency for each distinct non-null value of a column.
It returns:
1. null if the table is empty or all values of the column are null.
2. (distinct non-null value, frequency) pairs if the number of distinct
non-null values is less than or equal to the specified threshold.
3. an empty result if the number of distinct non-null values exceeds that
threshold.
was:
The MapAggregate function Computes frequency for each distinct non-null value
of a column.
It returns: 1. null if the table is empty or all values of the column are null.
2. (distinct non-null value, frequency) pairs if the number of distinct
non-null values is
less than or equal to the specified threshold.
3. an empty result if the number of distinct non-null values exceeds that
threshold.
> Aggregation function for computing endpoints for histograms
> -----------------------------------------------------------
>
> Key: SPARK-18000
> URL: https://issues.apache.org/jira/browse/SPARK-18000
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Zhenhua Wang
>
> This function Computes frequency for each distinct non-null value of a column.
> It returns:
> 1. null if the table is empty or all values of the column are null.
> 2. (distinct non-null value, frequency) pairs if the number of distinct
> non-null values is less than or equal to the specified threshold.
> 3. an empty result if the number of distinct non-null values exceeds that
> threshold.
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