Class

io.delta.sql

DeltaSparkSessionExtension

Related Doc: package sql

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class DeltaSparkSessionExtension extends (SparkSessionExtensions) ⇒ Unit

An extension for Spark SQL to activate Delta SQL parser to support Delta SQL grammar.

Scala example to create a SparkSession with the Delta SQL parser:

import org.apache.spark.sql.SparkSession

val spark = SparkSession
   .builder()
   .appName("...")
   .master("...")
   .config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
   .getOrCreate()

Java example to create a SparkSession with the Delta SQL parser:

import org.apache.spark.sql.SparkSession;

SparkSession spark = SparkSession
             .builder()
             .appName("...")
             .master("...")
             .config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
             .getOrCreate();

Python example to create a SparkSession with the Delta SQL parser (PySpark doesn't pick up the SQL conf "spark.sql.extensions" in Apache Spark 2.4.x, hence we need to activate it manually in 2.4.x. However, because SparkSession has been created and everything has been materialized, we need to clone a new session to trigger the initialization. See SPARK-25003):

from pyspark.sql import SparkSession

spark = SparkSession \
    .builder \
    .appName("...") \
    .master("...") \
    .config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension") \
    .getOrCreate()
if spark.sparkContext().version < "3.":
    spark.sparkContext()._jvm.io.delta.sql.DeltaSparkSessionExtension() \
        .apply(spark._jsparkSession.extensions())
    spark = SparkSession(spark.sparkContext(), spark._jsparkSession.cloneSession())
Since

0.4.0

Linear Supertypes
(SparkSessionExtensions) ⇒ Unit, AnyRef, Any
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Instance Constructors

  1. new DeltaSparkSessionExtension()

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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. def andThen[A](g: (Unit) ⇒ A): (SparkSessionExtensions) ⇒ A

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    Definition Classes
    Function1
    Annotations
    @unspecialized()

  5. def apply(extensions: SparkSessionExtensions): Unit

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    Definition Classes
    DeltaSparkSessionExtension → Function1

  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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    protected[java.lang]
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    @throws( ... )

  8. def compose[A](g: (A) ⇒ SparkSessionExtensions): (A) ⇒ Unit

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    Definition Classes
    Function1
    Annotations
    @unspecialized()

  9. final def eq(arg0: AnyRef): Boolean

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  10. def equals(arg0: Any): Boolean

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  11. def finalize(): Unit

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    @throws( classOf[java.lang.Throwable] )

  12. final def getClass(): Class[_]

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  13. def hashCode(): Int

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  14. final def isInstanceOf[T0]: Boolean

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  15. final def ne(arg0: AnyRef): Boolean

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  16. final def notify(): Unit

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  17. final def notifyAll(): Unit

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  18. final def synchronized[T0](arg0: ⇒ T0): T0

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  19. def toString(): String

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  20. final def wait(): Unit

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    @throws( ... )

  21. final def wait(arg0: Long, arg1: Int): Unit

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  22. final def wait(arg0: Long): Unit

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Inherited from (SparkSessionExtensions) ⇒ Unit

Inherited from AnyRef

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