CreatableRelationProvider — Data Sources That Save Rows Per Save Mode

CreatableRelationProvider is a contract for data source providers that save the result of a structured query per save mode and return the schema.

Note
 A structured query is a DataFrame while the result are Rows.

CreatableRelationProvider is used when:

Table 1. CreatableRelationProvider’s Known Implementations
Name Description

JdbcRelationProvider

KafkaSourceProvider

CreatableRelationProvider Contract

package org.apache.spark.sql.sources

trait CreatableRelationProvider {
  def createRelation(
    sqlContext: SQLContext,
    mode: SaveMode,
    parameters: Map[String, String],
    data: DataFrame): BaseRelation
}
Table 2. CreatableRelationProvider Contract
Method Description

createRelation

Saves the result of a structured query to a target relation per save mode and parameters. Creates a BaseRelation to describe the scheme.

The save mode specifies what happens when the destination already exists:

  • Append

  • ErrorIfExists

  • Ignore

  • Overwrite

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