C# Class Deveel.Data.Sql.Expressions.SqlExpressionExtensions

Extension methods to SqlExpression

Mostra file Open project: deveel/deveeldb

Public Methods

Method	Description
AsQueryPlan ( this expression ) : IQueryPlanNode
AsReferenceName ( this expression ) : ObjectName	Extracts the name of the reference from the expression.
EvaluateToConstant ( this expression, EvaluateContext context ) : Field	Evaluates the expression and reduces to a constant expression, whose value is then returned.
EvaluateToConstant ( this expression, IRequest request, IVariableResolver variableResolver ) : Field
HasAggregate ( this expression, IRequest query ) : bool	Verifies if the expression contains any aggregate function in the tree.
IsConstant ( this expression ) : bool
ReturnType ( this expression, IRequest query, IVariableResolver variableResolver ) : SqlType	Gets the return type of the expression when evaluated.

public static AsQueryPlan ( this expression ) : IQueryPlanNode
expression	this
return	IQueryPlanNode

Extracts the name of the reference from the expression.

public static AsReferenceName ( this expression ) : ObjectName
expression	this	The expression that encapsulates the reference
return	ObjectName

Evaluates the expression and reduces to a constant expression, whose value is then returned.

/// If the expression could not be evaluated or if the result of the /// evaluation is not a . ///

public static EvaluateToConstant ( this expression, EvaluateContext context ) : Field
expression	this	The expression to evaluate.
context	EvaluateContext	The context used to evaluate the expression.
return	Field

public static EvaluateToConstant ( this expression, IRequest request, IVariableResolver variableResolver ) : Field
expression	this
request	IRequest
variableResolver	IVariableResolver
return	Field

Verifies if the expression contains any aggregate function in the tree.

public static HasAggregate ( this expression, IRequest query ) : bool
expression	this	The expression to verify.
query	IRequest
return	bool

public static IsConstant ( this expression ) : bool
expression	this
return	bool

Gets the return type of the expression when evaluated.

public static ReturnType ( this expression, IRequest query, IVariableResolver variableResolver ) : SqlType
expression	this	The expression to check.
query	IRequest	The query context used to evaluate the return type /// of the expression.
variableResolver	IVariableResolver	The object used to resolve variable references in the expression tree.
return	SqlType