[jira] [Commented] (SPARK-14488) Creating temporary table using SQL DDL shouldn't write files to file system

["Cheng Lian (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-14488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232030#comment-15232030 ] 

Cheng Lian commented on SPARK-14488:
------------------------------------

Oh, wait... Since there's a {{USING}} in the DDL statement, are we supposed to write the query result using given data source format on disk, and use written files to create a temporary table? So basically this DDL is used to save a query result using a specific data source format to disk? I find this one quite confusing...

> Creating temporary table using SQL DDL shouldn't write files to file system
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-14488
>                 URL: https://issues.apache.org/jira/browse/SPARK-14488
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Cheng Lian
>            Assignee: Cheng Lian
>
> The following Spark shell snippet shows that currently temporary table creation writes files to file system:
> {code}
> sqlContext range 10 registerTempTable "t"
> sqlContext sql "create temporary table s using parquet as select * from t"
> {code}
> The problematic code is [here|https://github.com/apache/spark/blob/73b56a3c6c5c590219b42884c8bbe88b0a236987/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/ddl.scala#L137].



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