[jira] [Assigned] (SPARK-17492) Reading Cataloged Data Sources without Extending SchemaRelationProvider

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

     [ https://issues.apache.org/jira/browse/SPARK-17492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-17492:
------------------------------------

    Assignee:     (was: Apache Spark)

> Reading Cataloged Data Sources without Extending SchemaRelationProvider
> -----------------------------------------------------------------------
>
>                 Key: SPARK-17492
>                 URL: https://issues.apache.org/jira/browse/SPARK-17492
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: Xiao Li
>
> For data sources without extending `SchemaRelationProvider`, we expect users to not specify schemas when they creating tables. If the schema is input from users, an exception is issued. 
> Since Spark 2.1, for any data source, to avoid infer the schema every time, we store the schema in the metastore catalog. Thus, when reading a cataloged data source table, the schema could be read from metastore catalog. In this case, we also got an exception. For example, 
> {noformat}
> sql(
>   s"""
>      |CREATE TABLE relationProvierWithSchema
>      |USING org.apache.spark.sql.sources.SimpleScanSource
>      |OPTIONS (
>      |  From '1',
>      |  To '10'
>      |)
>    """.stripMargin)
> spark.table(tableName).show()
> {noformat}
> {noformat}
> org.apache.spark.sql.sources.SimpleScanSource does not allow user-specified schemas.;
> {noformat}



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