Spark Project Catalyst 4.1.0 API < Back

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package root
Definition Classes
root
package org
Definition Classes
root
package apache
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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 aggregate
Definition Classes
expressions
AggregateExpression
AggregateFunction
AggregateMode
AnyValue
ApproxCountDistinctForIntervals
ApproxTopK
ApproxTopKAccumulate
ApproxTopKAggregateBuffer
ApproxTopKCombine
ApproximatePercentile
Average
BitAggregate
BitAndAgg
BitOrAgg
BitXorAgg
BloomFilterAggregate
BoolAnd
BoolOr
CentralMomentAgg
Collect
CollectList
CollectSet
CollectTopK
CombineInternal
Complete
Corr
Count
CountIf
CountMinSketchAgg
CountMinSketchAggExpressionBuilder
CovPopulation
CovSample
Covariance
DeclarativeAggregate
Final
FinalizedSketch
First
FirstLast
HistogramNumeric
HllSketchAgg
HllUnionAgg
HyperLogLogPlusPlus
ImperativeAggregate
IntersectionAggregationBuffer
KllSketchAggBase
KllSketchAggBigint
KllSketchAggDouble
KllSketchAggFloat
Kurtosis
Last
ListAgg
Max
MaxBy
MaxMinBy
Median
Min
MinBy
Mode
ModeBuilder
NoOp
NumericHistogramSerializer
PandasCovar
PandasKurtosis
PandasMode
PandasProduct
PandasSkewness
PandasStddev
PandasVariance
Partial
PartialMerge
PearsonCorrelation
Percentile
PercentileBase
PercentileCont
PercentileContBuilder
PercentileDisc
PercentileDiscBuilder
PivotFirst
Product
RegrAvgX
RegrAvgY
RegrCount
RegrIntercept
RegrR2
RegrReplacement
RegrSXX
RegrSXY
RegrSYY
RegrSlope
Skewness
StddevPop
StddevSamp
Sum
SupportsOrderingWithinGroup
ThetaIntersectionAgg
ThetaSketchAgg
ThetaSketchState
ThetaUnionAgg
TryAverageExpressionBuilder
TrySumExpressionBuilder
TypedAggregateWithHashMapAsBuffer
TypedImperativeAggregate
UnionAggregationBuffer
UpdatableSketchBuffer
V2Aggregator
VariancePop
VarianceSamp

org.apache.spark.sql.catalyst.expressions.aggregate

ApproxTopK

Companion class ApproxTopK

object ApproxTopK extends Serializable

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final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##: Int
Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean
Definition Classes
AnyRef → Any
def DDLToDataType(ddl: String): DataType
val DEFAULT_K: Int
val DEFAULT_MAX_ITEMS_TRACKED: Int
val MAX_ITEMS_TRACKED_LIMIT: Int
val VOID_MAX_ITEMS_TRACKED: Int
final def asInstanceOf[T0]: T0
Definition Classes
Any
def calMaxMapSize(maxItemsTracked: Int): Int
def checkExpressionNotNull(expr: Expression, exprName: String): Unit
def checkK(k: Int): Unit
def checkMaxItemsTracked(maxItemsTracked: Int, k: Int): Unit
def checkMaxItemsTracked(maxItemsTracked: Int): Unit
def checkStateFieldAndType(state: Expression): TypeCheckResult
def clone(): AnyRef
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
def createItemsSketch(itemExpression: Expression, maxMapSize: Int): ItemsSketch[Any]
def dataTypeToDDL(dataType: DataType): String
final def eq(arg0: AnyRef): Boolean
Definition Classes
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def equals(arg0: AnyRef): Boolean
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def genSketchSerDe(dataType: DataType): ArrayOfItemsSerDe[Any]
final def getClass(): Class[_ <: AnyRef]
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@IntrinsicCandidate() @native()
def getResultDataType(itemDataType: DataType): DataType
def getSketchStateDataType(itemDataType: DataType): StructType
def hashCode(): Int
Definition Classes
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@IntrinsicCandidate() @native()
def isDataTypeSupported(itemType: DataType): Boolean
final def isInstanceOf[T0]: Boolean
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final def ne(arg0: AnyRef): Boolean
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final def notify(): Unit
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final def notifyAll(): Unit
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@IntrinsicCandidate() @native()
final def synchronized[T0](arg0: => T0): T0
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def toString(): String
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final def wait(arg0: Long, arg1: Int): Unit
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@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
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@throws(classOf[java.lang.InterruptedException]) @native()
final def wait(): Unit
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def finalize(): Unit
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protected[lang]
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@throws(classOf[java.lang.Throwable]) @Deprecated
Deprecated
(Since version 9)

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