Package se.kuseman.payloadbuilder.api.expression

Interface IExpression

All Known Subinterfaces:

IArithmeticBinaryExpression, IArithmeticUnaryExpression, IAtTimeZoneExpression, IBinaryExpression, ICaseExpression, ICastExpression, IColumnExpression, IComparisonExpression, IDateAddExpression, IDateDiffExpression, IDatePartExpression, IDereferenceExpression, IFunctionCallExpression, IInExpression, ILambdaExpression, ILikeExpression, ILiteralArrayExpression, ILiteralBooleanExpression, ILiteralDateTimeExpression, ILiteralDateTimeOffsetExpression, ILiteralDecimalExpression, ILiteralDoubleExpression, ILiteralExpression, ILiteralFloatExpression, ILiteralIntegerExpression, ILiteralLongExpression, ILiteralNullExpression, ILiteralObjectExpression, ILiteralStringExpression, ILogicalBinaryExpression, ILogicalNotExpression, INamedExpression, INestedExpression, INullPredicateExpression, ISubscriptExpression, ITemplateStringExpression, IUnaryExpression, IVariableExpression

public interface IExpression

Definition of an expression

Method Summary

Modifier and Type	Method	Description
default <T, C> T	accept(IExpressionVisitor<T,C> visitor, C context)	Accept visitor
default ValueVector	eval(IExecutionContext context)	Evaluate expression.
ValueVector	eval(TupleVector input, IExecutionContext context)	Evaluate expression against input
default ValueVector	eval(TupleVector input, ValueVector selection, IExecutionContext context)	Evaluate this expression against input with a row selection.
default IExpression	fold()	Fold this expression.
default List<IExpression>	getChildren()	Get child expressions if any
default QualifiedName	getQualifiedColumn()	Return a qualified column name for this expression if any exists otherwise null
ResolvedType	getType()	Get type of this expression
default boolean	isConstant()	Is this expression constant
default boolean	isInternal()	Returns true if this expression is internal and used between plans etc.
default boolean	semanticEquals(IExpression expression)	Returns true if this expression is semantic equal to provided expression.
default String	toVerboseString()	Return a verbose string that can be used in plan printing etc.

Method Details

eval

ValueVector eval(TupleVector input,
 IExecutionContext context)

Evaluate expression against input

eval

default ValueVector eval(TupleVector input,
 ValueVector selection,
 IExecutionContext context)

Evaluate this expression against input with a row selection. NOTE! This method should be overriden by expressions to avoid creating a filter vector. This is only for backwards compatibility and should be made non default.

Parameters:

input - Input vector

selection - Integer vector for rows to evaluate

context - Execution context

eval

default ValueVector eval(IExecutionContext context)

Evaluate expression. NOTE! This method should only be called on expression not needing any intput vector. Ie. from a IPredicate

getType

ResolvedType getType()

Get type of this expression

isConstant

default boolean isConstant()

Is this expression constant

accept

default <T,
C> T accept(IExpressionVisitor<T,C> visitor,
 C context)

Accept visitor

fold

default IExpression fold()

Fold this expression. Eliminate constants etc.

getChildren

default List<IExpression> getChildren()

Get child expressions if any

isInternal

default boolean isInternal()

Returns true if this expression is internal and used between plans etc. and should not be written to output

getQualifiedColumn

default QualifiedName getQualifiedColumn()

Return a qualified column name for this expression if any exists otherwise null

toVerboseString

default String toVerboseString()

Return a verbose string that can be used in plan printing etc. for easier debugging.

semanticEquals

default boolean semanticEquals(IExpression expression)

Returns true if this expression is semantic equal to provided expression. That is the meaning is equal but not necessary object equality equal. ie. "col1 + col2" = "col2 + col2"