Package org.rumbledb.runtime.misc

Class ComparisonIterator

java.lang.Object

org.rumbledb.runtime.RuntimeIterator

org.rumbledb.runtime.AtMostOneItemLocalRuntimeIterator

org.rumbledb.runtime.misc.ComparisonIterator

All Implemented Interfaces:

com.esotericsoftware.kryo.KryoSerializable, Serializable, RuntimeIteratorInterface

public class ComparisonIterator
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
ComparisonIterator(RuntimeIterator leftIterator, RuntimeIterator rightIterator, ComparisonExpression.ComparisonOperator comparisonOperator, RuntimeStaticContext staticContext)

Method Summary

Modifier and Type	Method	Description
static long	compareItems(Item left, Item right, ComparisonExpression.ComparisonOperator comparisonOperator, ExceptionMetadata ignoredMetadata)
NativeClauseContext	generateNativeQuery(NativeClauseContext nativeClauseContext)	This function generate (if possible) a native spark-sql query that maps the inner working of the iterator
ComparisonExpression.ComparisonOperator	getComparisonOperator()
RuntimeIterator	getLeftIterator()
RuntimeIterator	getRightIterator()
boolean	isValueEquality()
Item	materializeFirstItemOrNull(DynamicContext dynamicContext)

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, getVariableDependencies, 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

ComparisonIterator

public ComparisonIterator(RuntimeIterator leftIterator,
 RuntimeIterator rightIterator,
 ComparisonExpression.ComparisonOperator comparisonOperator,
 RuntimeStaticContext staticContext)

Method Details

getComparisonOperator

public ComparisonExpression.ComparisonOperator getComparisonOperator()

isValueEquality

public boolean isValueEquality()

getLeftIterator

public RuntimeIterator getLeftIterator()

getRightIterator

public RuntimeIterator getRightIterator()

materializeFirstItemOrNull

public Item materializeFirstItemOrNull(DynamicContext dynamicContext)

Specified by:

materializeFirstItemOrNull in class AtMostOneItemLocalRuntimeIterator

compareItems

public static long compareItems(Item left,
 Item right,
 ComparisonExpression.ComparisonOperator comparisonOperator,
 ExceptionMetadata ignoredMetadata)

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