Package org.rumbledb.runtime.functions.sequences.aggregate

Class CountFunctionIterator

java.lang.Object

org.rumbledb.runtime.plan.RuntimePlan<Item>

org.rumbledb.runtime.plan.ItemRuntimePlan

org.rumbledb.runtime.AbstractAtMostOneItemRuntimePlan

org.rumbledb.runtime.functions.sequences.aggregate.CountFunctionIterator

All Implemented Interfaces:

Serializable, AtMostOneLocalRuntimePlan<Item>, LocalRuntimePlan<Item>, NativeQueryRuntimePlan

public class CountFunctionIterator
extends AbstractAtMostOneItemRuntimePlan
implements NativeQueryRuntimePlan

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.rumbledb.runtime.plan.RuntimePlan

staticContext

Constructor Summary

Constructors

Constructor	Description
CountFunctionIterator(List<ItemRuntimePlan> arguments, RuntimeStaticContext staticContext)

Method Summary

Modifier and Type	Method	Description
static Item	computeCount(ItemRuntimePlan iterator, DynamicContext context, ExceptionMetadata metadata)
Item	evaluateAtMostOne(DynamicContext context)	Evaluates the plan without allocating a cursor.
NativeClauseContext	generateNativeQuery(NativeClauseContext nativeClauseContext)
Map<Name,DynamicContext.VariableDependency>	getVariableDependencies()

Methods inherited from class org.rumbledb.runtime.AbstractAtMostOneItemRuntimePlan

createNativeCursor

Methods inherited from class org.rumbledb.runtime.plan.ItemRuntimePlan

getChild, getChildren, getStaticType, isSparkJobNeeded, print

Methods inherited from class org.rumbledb.runtime.plan.RuntimePlan

getConfiguration, getCursor, getDataFrame, getMetadata, getRDD, getRuntimeStaticContext, materialize, materializeAtMost, materializeAtMostOne, materializeExactlyOne, materializeFirstOrNull

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CountFunctionIterator

public CountFunctionIterator(List<ItemRuntimePlan> arguments,
 RuntimeStaticContext staticContext)

Method Details

evaluateAtMostOne

public Item evaluateAtMostOne(DynamicContext context)

Description copied from interface: AtMostOneLocalRuntimePlan

Evaluates the plan without allocating a cursor.

Specified by:

evaluateAtMostOne in interface AtMostOneLocalRuntimePlan<Item>

Specified by:

evaluateAtMostOne in class AbstractAtMostOneItemRuntimePlan

Parameters:

context - the dynamic context for the evaluation

Returns:

the value, or null for the empty sequence

computeCount

public static Item computeCount(ItemRuntimePlan iterator,
 DynamicContext context,
 ExceptionMetadata metadata)

getVariableDependencies

public Map<Name,DynamicContext.VariableDependency> getVariableDependencies()

Overrides:

getVariableDependencies in class ItemRuntimePlan

generateNativeQuery

public NativeClauseContext generateNativeQuery(NativeClauseContext nativeClauseContext)

Specified by:

generateNativeQuery in interface NativeQueryRuntimePlan