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

Class CountFunctionIterator

java.lang.Object

org.rumbledb.runtime.RuntimeIterator

org.rumbledb.runtime.AtMostOneItemLocalRuntimeIterator

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

All Implemented Interfaces:

com.esotericsoftware.kryo.KryoSerializable, Serializable, RuntimeIteratorInterface

public class CountFunctionIterator
extends AtMostOneItemLocalRuntimeIterator

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.rumbledb.runtime.RuntimeIterator

children, currentDynamicContextForLocalExecution, FLOW_EXCEPTION_MESSAGE, hasNext, isOpen, isSequential, isUpdating, staticContext, staticURI

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
static Item	computeCount(RuntimeIterator iterator, DynamicContext context, ExceptionMetadata metadata)
NativeClauseContext	generateNativeQuery(NativeClauseContext nativeClauseContext)	This function generate (if possible) a native spark-sql query that maps the inner working of the iterator
Map<Name,DynamicContext.VariableDependency>	getVariableDependencies()
Item	materializeFirstItemOrNull(DynamicContext context)

Methods inherited from class org.rumbledb.runtime.AtMostOneItemLocalRuntimeIterator

close, getEffectiveBooleanValueOrCheckPosition, getRDD, materialize, materializeAtMostOneItemOrNull, materializeExactlyOneItem, materializeNFirstItems, next, open, reset

Methods inherited from class org.rumbledb.runtime.RuntimeIterator

bindToVariableInDynamicContext, canProduceDataFrame, deepCopy, getConfiguration, getDataFrame, getEffectiveBooleanValue, getHighestExecutionMode, getMetadata, getOrCreateDataFrame, getPendingUpdateList, getStaticType, hasNext, isDataFrame, isLocal, isOpen, isRDD, isRDDOrDataFrame, isSequential, isSparkJobNeeded, isUpdating, materialize, materializeAtMostOneItemOrDefault, print, printToStandardError, read, setStaticContext, write

Methods inherited from class java.lang.Object

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

Constructor Details

CountFunctionIterator

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

Method Details

materializeFirstItemOrNull

public Item materializeFirstItemOrNull(DynamicContext context)

Specified by:

materializeFirstItemOrNull in class AtMostOneItemLocalRuntimeIterator

computeCount

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

getVariableDependencies

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

Overrides:

getVariableDependencies in class RuntimeIterator

generateNativeQuery

public NativeClauseContext generateNativeQuery(NativeClauseContext nativeClauseContext)

Description copied from class: RuntimeIterator

This function generate (if possible) a native spark-sql query that maps the inner working of the iterator

Overrides:

generateNativeQuery in class RuntimeIterator

Parameters:

nativeClauseContext - context information to generate the native query

Returns:

a native clause context with the spark-sql native query to get an equivalent result of the iterator, or [NativeClauseContext.NoNativeQuery] if it is not possible