InsertableRelation Contract — Non-File-Based Relations with Inserting or Overwriting Data Support

2012-06-15 分类：spark-sql 阅读(1520) 评论(0)

InsertableRelation is the contract of non-file-based BaseRelations that support inserting or overwriting data.



package org.apache.spark.sql.sources

trait InsertableRelation {
  def insert(data: DataFrame, overwrite: Boolean): Unit
}

package org.apache.spark.sql.sources

trait InsertableRelation {

def insert(data: DataFrame, overwrite: Boolean): Unit

}

Table 1. InsertableRelation Contract
Property	Description
`insert`	Inserts or overwrites data (as DataFrame) in a relation Used exclusively when `InsertIntoDataSourceCommand` logical command is executed

Note	JDBCRelation is the one and only known direct implementation of InsertableRelation Contract in Spark SQL.

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