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Posted to issues@spark.apache.org by "webber (JIRA)" <ji...@apache.org> on 2018/12/13 03:07:00 UTC

[jira] [Updated] (SPARK-26291) how to get the number of rows when i write or read use datasourceV2

     [ https://issues.apache.org/jira/browse/SPARK-26291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

webber updated SPARK-26291:
---------------------------
    Shepherd: Gabor Somogyi

> how to get the number of rows when i write or read use datasourceV2
> -------------------------------------------------------------------
>
>                 Key: SPARK-26291
>                 URL: https://issues.apache.org/jira/browse/SPARK-26291
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: webber
>            Priority: Major
>             Fix For: 2.4.0
>
>
> how to get the number of rows when i write or read on external data storage by java datasourceV2 simplely. Now， when i read from a external data storage to show, i get a dataset, i need to do dataset.count to get the number. when i write to a external data storage, i  need to do writer.save, and then i have to do dataset.count to get the number too. How can i count the number In the process of writer, but _additional dataset.count_



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