Package org.elasticsearch.xpack.esql.expression.function.scalar.date

Class DateDiff

java.lang.Object

org.elasticsearch.xpack.esql.core.tree.Node<Expression>

org.elasticsearch.xpack.esql.core.expression.Expression

org.elasticsearch.xpack.esql.core.expression.function.Function

org.elasticsearch.xpack.esql.core.expression.function.scalar.ScalarFunction

org.elasticsearch.xpack.esql.expression.function.scalar.EsqlScalarFunction

org.elasticsearch.xpack.esql.expression.function.scalar.date.DateDiff

All Implemented Interfaces:

NamedWriteable, Writeable, Resolvable, EvaluatorMapper

public class DateDiff
extends EsqlScalarFunction

Subtract the second argument from the third argument and return their difference in multiples of the unit specified in the first argument. If the second argument (start) is greater than the third argument (end), then negative values are returned.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	DateDiff.DateDiffConstantFactory
static interface	DateDiff.DateDiffFactory
static enum	DateDiff.Part	Represents units that can be used for DATE_DIFF function and how the difference between 2 dates is calculated

Nested classes/interfaces inherited from class org.elasticsearch.xpack.esql.core.expression.Expression

Expression.TypeResolution

Nested classes/interfaces inherited from interface org.elasticsearch.xpack.esql.evaluator.mapper.EvaluatorMapper

EvaluatorMapper.ToEvaluator

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Field Summary

Fields

Modifier and Type	Field	Description
static final NamedWriteableRegistry.Entry	ENTRY
static final ZoneId	UTC

Constructor Summary

Constructors

Constructor	Description
DateDiff(Source source, Expression unit, Expression startTimestamp, Expression endTimestamp)

Method Summary

Modifier and Type	Method	Description
DataType	dataType()
boolean	foldable()
String	getWriteableName()
protected NodeInfo<? extends Expression>	info()
Expression	replaceChildren(List<Expression> newChildren)
protected Expression.TypeResolution	resolveType()
EvalOperator.ExpressionEvaluator.Factory	toEvaluator(EvaluatorMapper.ToEvaluator toEvaluator)	Convert this into an EvalOperator.ExpressionEvaluator.
void	writeTo(StreamOutput out)

Methods inherited from class org.elasticsearch.xpack.esql.expression.function.scalar.EsqlScalarFunction

fold

Methods inherited from class org.elasticsearch.xpack.esql.core.expression.function.Function

arguments, equals, functionName, hashCode, nodeString, nullable

Methods inherited from class org.elasticsearch.xpack.esql.core.expression.Expression

canonical, canonicalize, childrenResolved, propertiesToString, references, resolved, semanticEquals, semanticHash, toString, typeResolved

Methods inherited from class org.elasticsearch.xpack.esql.core.tree.Node

anyMatch, children, collect, collectFirstChildren, collectLeaves, doCollectFirst, forEachDown, forEachDown, forEachProperty, forEachPropertyDown, forEachPropertyOnly, forEachPropertyUp, forEachUp, forEachUp, nodeName, nodeProperties, replaceChildrenSameSize, source, sourceLocation, sourceText, transformChildren, transformDown, transformDown, transformNodeProps, transformPropertiesDown, transformPropertiesOnly, transformPropertiesUp, transformUp, transformUp

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.elasticsearch.xpack.esql.evaluator.mapper.EvaluatorMapper

fold

Field Details

ENTRY

public static final NamedWriteableRegistry.Entry ENTRY

UTC

public static final ZoneId UTC

Constructor Details

DateDiff

public DateDiff(Source source,
 Expression unit,
 Expression startTimestamp,
 Expression endTimestamp)

Method Details

writeTo

public void writeTo(StreamOutput out)
             throws IOException

Throws:

IOException

getWriteableName

public String getWriteableName()

toEvaluator

public EvalOperator.ExpressionEvaluator.Factory toEvaluator(EvaluatorMapper.ToEvaluator toEvaluator)

Description copied from interface: EvaluatorMapper

Convert this into an EvalOperator.ExpressionEvaluator.

Note for implementors: If you are implementing this function, you should call the passed-in lambda on your children, after doing any other manipulation (casting, etc.) necessary.

Note for Callers: If you are attempting to call this method, and you have an Expression and a Layout, you likely want to call EvalMapper.toEvaluator(org.elasticsearch.xpack.esql.core.expression.FoldContext, org.elasticsearch.xpack.esql.core.expression.Expression, org.elasticsearch.xpack.esql.planner.Layout) instead. On the other hand, if you already have something that looks like the parameter for this method, you should call this method with that function.

Build an EvalOperator.ExpressionEvaluator.Factory for the tree of expressions rooted at this node. This is only guaranteed to return a sensible evaluator if this node has a valid type. If this node is a subclass of Expression then "valid type" means that Expression.typeResolved() returns a non-error resolution. If Expression.typeResolved() returns an error then this method may throw. Or return an evaluator that produces garbage. Or return an evaluator that throws when run.

resolveType

protected Expression.TypeResolution resolveType()

Overrides:

resolveType in class Expression

foldable

public boolean foldable()

Overrides:

foldable in class Expression

dataType

public DataType dataType()

Specified by:

dataType in class Expression

replaceChildren

public Expression replaceChildren(List<Expression> newChildren)

Specified by:

replaceChildren in class Node<Expression>

info

protected NodeInfo<? extends Expression> info()

Specified by:

info in class Node<Expression>