org.apache.spark.sql.sources

RelationProvider

trait RelationProvider extends AnyRef

::DeveloperApi:: Implemented by objects that produce relations for a specific kind of data source. When Spark SQL is given a DDL operation with a USING clause specified (to specify the implemented RelationProvider), this interface is used to pass in the parameters specified by a user.

Users may specify the fully qualified class name of a given data source. When that class is not found Spark SQL will append the class name DefaultSource to the path, allowing for less verbose invocation. For example, 'org.apache.spark.sql.json' would resolve to the data source 'org.apache.spark.sql.json.DefaultSource'

A new instance of this class with be instantiated each time a DDL call is made.

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@DeveloperApi()
Since

1.3.0

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  1. abstract def createRelation(sqlContext: SQLContext, parameters: Map[String, String]): BaseRelation

    Returns a new base relation with the given parameters.

    Returns a new base relation with the given parameters. Note: the parameters' keywords are case insensitive and this insensitivity is enforced by the Map that is passed to the function.

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