Packages

package root

Definition Classes: root

package org

Definition Classes: root

package apache

Definition Classes: org

package spark

Definition Classes: apache

package sql

Definition Classes: spark

package catalyst

Catalyst is a library for manipulating relational query plans.

Catalyst is a library for manipulating relational query plans. All classes in catalyst are considered an internal API to Spark SQL and are subject to change between minor releases.

Definition Classes: sql

package expressions

A set of classes that can be used to represent trees of relational expressions.

A set of classes that can be used to represent trees of relational expressions. A key goal of the expression library is to hide the details of naming and scoping from developers who want to manipulate trees of relational operators. As such, the library defines a special type of expression, a NamedExpression in addition to the standard collection of expressions.

Standard Expressions

A library of standard expressions (e.g., Add, EqualTo), aggregates (e.g., SUM, COUNT), and other computations (e.g. UDFs). Each expression type is capable of determining its output schema as a function of its children's output schema.

Named Expressions

Some expression are named and thus can be referenced by later operators in the dataflow graph. The two types of named expressions are AttributeReferences and Aliases. AttributeReferences refer to attributes of the input tuple for a given operator and form the leaves of some expression trees. Aliases assign a name to intermediate computations. For example, in the SQL statement SELECT a+b AS c FROM ..., the expressions a and b would be represented by AttributeReferences and c would be represented by an Alias.

During analysis, all named expressions are assigned a globally unique expression id, which can be used for equality comparisons. While the original names are kept around for debugging purposes, they should never be used to check if two attributes refer to the same value, as plan transformations can result in the introduction of naming ambiguity. For example, consider a plan that contains subqueries, both of which are reading from the same table. If an optimization removes the subqueries, scoping information would be destroyed, eliminating the ability to reason about which subquery produced a given attribute.

Evaluation

The result of expressions can be evaluated using the Expression.apply(Row) method.

Definition Classes: catalyst

package codegen

A collection of generators that build custom bytecode at runtime for performing the evaluation of catalyst expression.

Definition Classes: expressions

BaseMutableProjection

ExpressionCanonicalizer

FalseLiteral

GenerateMutableProjection

GenerateOrdering

GeneratePredicate

GenerateSafeProjection

GenerateUnsafeProjection

GenerateUnsafeRowJoiner

LazilyGeneratedOrdering

LiteralValue

SimpleExprValue

SubExprCodes

SubExprEliminationState

org.apache.spark.sql.catalyst.expressions.codegen

JavaCode

Companion trait JavaCode

object JavaCode

Utility functions for creating JavaCode fragments.

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final def !=(arg0: Any): Boolean
Definition Classes
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final def ##: Int
Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean
Definition Classes
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final def asInstanceOf[T0]: T0
Definition Classes
Any
def boxedType(dataType: DataType): Inline
Create an Inline for boxed Java Type name.
def clone(): AnyRef
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native()
def defaultLiteral(dataType: DataType): LiteralValue
Create a default literal.
Create a default literal. This is null for reference types, false for boolean types and -1 for other primitive types.
final def eq(arg0: AnyRef): Boolean
Definition Classes
AnyRef
def equals(arg0: AnyRef): Boolean
Definition Classes
AnyRef → Any
def expression(code: String, javaClass: Class[_]): SimpleExprValue
Create an expression fragment.
def expression(code: String, dataType: DataType): SimpleExprValue
Create an expression fragment.
def finalize(): Unit
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable])
final def getClass(): Class[_ <: AnyRef]
Definition Classes
AnyRef → Any
Annotations
@native()
def global(name: String, javaClass: Class[_]): GlobalValue
Create a global java variable.
def global(name: String, dataType: DataType): GlobalValue
Create a global java variable.
def hashCode(): Int
Definition Classes
AnyRef → Any
Annotations
@native()
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
def isNullExpression(code: String): SimpleExprValue
Create a isNull expression fragment.
def isNullGlobal(name: String): GlobalValue
Create a global isNull variable.
def isNullVariable(name: String): VariableValue
Create a local isNull variable.
def javaType(dataType: DataType): Inline
Create an Inline for Java Type name.
def javaType(javaClass: Class[_]): Inline
Create an Inline for Java Class name.
def literal(v: String, dataType: DataType): LiteralValue
Create a java literal.
final def ne(arg0: AnyRef): Boolean
Definition Classes
AnyRef
final def notify(): Unit
Definition Classes
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Annotations
@native()
final def notifyAll(): Unit
Definition Classes
AnyRef
Annotations
@native()
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
def toString(): String
Definition Classes
AnyRef → Any
def variable(name: String, javaClass: Class[_]): VariableValue
Create a local java variable.
def variable(name: String, dataType: DataType): VariableValue
Create a local java variable.
final def wait(): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long, arg1: Int): Unit
Definition Classes
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Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()

Packages

Standard Expressions

Named Expressions

Evaluation

JavaCode

Companion trait JavaCode

object JavaCode

Value Members

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Packages

Standard Expressions

Named Expressions

Evaluation

JavaCode

Companion trait JavaCode

object JavaCode

Value Members

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Inherited from Any

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JavaCode