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https://issues.apache.org/jira/browse/SPARK-20028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15932254#comment-15932254
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Apache Spark commented on SPARK-20028:
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User 'gczsjdy' has created a pull request for this issue:
https://github.com/apache/spark/pull/17359
> Implement NGrams aggregate function
> -----------------------------------
>
> Key: SPARK-20028
> URL: https://issues.apache.org/jira/browse/SPARK-20028
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Chenzhao Guo
>
> N-grams are subsequences of length N drawn from a longer sequence. The
> purpose of the ngrams() is to find the k most frequent n-grams from one or
> more sequences.
> The aggregation function has the pattern of :
> ngrams(array<array<string>>(or array<string>), int N, int K, int accuracy),
> where
> the first parameter indicates the 'longer sequence' we collect n-grams from,
> N & K indicates the top k n-grams,
> Accuracy indicates the frequency counting accuracy.
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