[jira] [Commented] (SPARK-14832) Refactor DataSource to ensure schema is inferred only once when creating a file stream

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-14832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15253107#comment-15253107 ] 

Apache Spark commented on SPARK-14832:
--------------------------------------

User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/12591

> Refactor DataSource to ensure schema is inferred only once when creating a file stream
> --------------------------------------------------------------------------------------
>
>                 Key: SPARK-14832
>                 URL: https://issues.apache.org/jira/browse/SPARK-14832
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL, Streaming
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>
> When creating a file stream using sqlContext.write.stream(), existing files are scanned twice for finding the schema 
> - Once, when creating a DataSource + StreamingRelation in the DataFrameReader.stream()
> - Again, when creating streaming Source from the DataSource, in DataSource.createSource()
> Instead, the schema should be generated only once, at the time of creating the dataframe, and when the streaming source is created, it should just reuse that schema



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