Package org.rumbledb.runtime.misc

Class ComparisonIterator

java.lang.Object

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

org.rumbledb.runtime.plan.ItemRuntimePlan

org.rumbledb.runtime.AbstractAtMostOneItemRuntimePlan

org.rumbledb.runtime.misc.ComparisonIterator

All Implemented Interfaces:

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

public class ComparisonIterator
extends AbstractAtMostOneItemRuntimePlan
implements NativeQueryRuntimePlan

This class performs value or general comparison of two items. The difference lies in the way untyped values are cast. The existential quantification logic for general comparison is not handled in this iterator, but in the ComparisonVisitor.

See Also:

• Serialized Form

Field Summary

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

staticContext

Constructor Summary

Constructors

Constructor	Description
ComparisonIterator(ItemRuntimePlan leftIterator, ItemRuntimePlan 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)
Item	evaluateAtMostOne(DynamicContext dynamicContext)	Evaluates the plan without allocating a cursor.
NativeClauseContext	generateNativeQuery(NativeClauseContext nativeClauseContext)
ComparisonExpression.ComparisonOperator	getComparisonOperator()
ItemRuntimePlan	getLeftIterator()
ItemRuntimePlan	getRightIterator()
boolean	isValueEquality()

Methods inherited from class org.rumbledb.runtime.AbstractAtMostOneItemRuntimePlan

createNativeCursor

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

getChild, getChildren, getStaticType, getVariableDependencies, 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

ComparisonIterator

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

Method Details

getComparisonOperator

public ComparisonExpression.ComparisonOperator getComparisonOperator()

isValueEquality

public boolean isValueEquality()

getLeftIterator

public ItemRuntimePlan getLeftIterator()

getRightIterator

public ItemRuntimePlan getRightIterator()

evaluateAtMostOne

public Item evaluateAtMostOne(DynamicContext dynamicContext)

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:

dynamicContext - the dynamic context for the evaluation

Returns:

the value, or null for the empty sequence

compareItems

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

generateNativeQuery

public NativeClauseContext generateNativeQuery(NativeClauseContext nativeClauseContext)

Specified by:

generateNativeQuery in interface NativeQueryRuntimePlan