Class Case
- All Implemented Interfaces:
NamedWriteable,Writeable,Resolvable,EvaluatorMapper
-
Nested Class Summary
Nested classes/interfaces inherited from class org.elasticsearch.xpack.esql.core.expression.Expression
Expression.TypeResolutionNested classes/interfaces inherited from interface org.elasticsearch.xpack.esql.evaluator.mapper.EvaluatorMapper
EvaluatorMapper.ToEvaluatorNested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable
Writeable.Reader<V>, Writeable.Writer<V> -
Field Summary
FieldsFields inherited from class org.elasticsearch.xpack.esql.core.expression.function.scalar.ScalarFunction
MAX_BYTES_REF_RESULT_SIZE -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptiondataType()booleanfoldable()protected NodeInfo<? extends Expression> info()nullable()partiallyFold(FoldContext ctx) Fold the arms ofCASEstatements.replaceChildren(List<Expression> newChildren) protected Expression.TypeResolutiontoEvaluator(EvaluatorMapper.ToEvaluator toEvaluator) Convert this into anEvalOperator.ExpressionEvaluator.voidwriteTo(StreamOutput out) Methods inherited from class org.elasticsearch.xpack.esql.expression.function.scalar.EsqlScalarFunction
foldMethods inherited from class org.elasticsearch.xpack.esql.core.expression.function.Function
arguments, equals, functionName, hashCode, nodeStringMethods inherited from class org.elasticsearch.xpack.esql.core.expression.Expression
canonical, canonicalize, childrenResolved, propertiesToString, references, resolved, semanticEquals, semanticHash, toString, typeResolvedMethods inherited from class org.elasticsearch.xpack.esql.core.tree.Node
anyMatch, children, collect, collectFirstChildren, collectLeaves, doCollectFirst, forEachDown, forEachDown, forEachDownMayReturnEarly, forEachProperty, forEachPropertyDown, forEachPropertyOnly, forEachPropertyUp, forEachUp, forEachUp, nodeName, nodeProperties, replaceChildrenSameSize, source, sourceLocation, sourceText, transformChildren, transformDown, transformDown, transformDown, transformNodeProps, transformPropertiesDown, transformPropertiesOnly, transformPropertiesUp, transformUp, transformUp, transformUpMethods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, waitMethods inherited from interface org.elasticsearch.xpack.esql.evaluator.mapper.EvaluatorMapper
fold
-
Field Details
-
ENTRY
-
-
Constructor Details
-
Case
-
-
Method Details
-
writeTo
- Throws:
IOException
-
getWriteableName
-
dataType
- Specified by:
dataTypein classExpression
-
resolveType
- Overrides:
resolveTypein classExpression
-
nullable
-
replaceChildren
- Specified by:
replaceChildrenin classNode<Expression>
-
info
- Specified by:
infoin classNode<Expression>
-
foldable
public boolean foldable()- Overrides:
foldablein classExpression
-
partiallyFold
Fold the arms ofCASEstatements.-
Conditions that evaluate to
falseare removed soEVAL c=CASE(false, foo, b, bar, bort)becomesEVAL c=CASE(b, bar, bort). -
Conditions that evaluate to
truestop evaluation and return themselves soEVAL c=CASE(true, foo, bar)becomesEVAL c=foo.
EVAL c=CASE(false, foo, b, bar, true, bort, el)becomesEVAL c=CASE(b, bar, bort). -
Conditions that evaluate to
-
toEvaluator
public EvalOperator.ExpressionEvaluator.Factory toEvaluator(EvaluatorMapper.ToEvaluator toEvaluator) Description copied from interface:EvaluatorMapperConvert this into anEvalOperator.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
Expressionand aLayout, you likely want to callEvalMapper.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.Factoryfor 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 ofExpressionthen "valid type" means thatExpression.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.
-