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Posted to issues@spark.apache.org by "Chenzhao Guo (JIRA)" <ji...@apache.org> on 2017/03/20 07:08:42 UTC
[jira] [Updated] (SPARK-20028) Implement NGrams aggregate function
[ https://issues.apache.org/jira/browse/SPARK-20028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chenzhao Guo updated SPARK-20028:
---------------------------------
Description:
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.
> 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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