Namespace LinqToDB.Internal.Expressions

Classes

ChangeTypeExpression

ConstantPlaceholderExpression

DefaultValueExpression

ExpressionConstants

ExpressionEqualityComparer

This API supports the linq2db infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

ExpressionEvaluator

ExpressionGenerator

ExpressionHelper

ExpressionHelpers

ExpressionInstances

Contains pre-created instances of ConstantExpression object for often used constants. Using those instances we avoid unnecessary allocations of same constant instances and avoid boxing for value constants (e.g. booleans, integers).

ExpressionPrinter

A class to create a printable string representation of expression.

ExpressionVisitorBase

MarkerExpression

SqlAggregateLifterExpression

Wraps a SqlPlaceholderExpression produced by an aggregate-function translator and carries up to two delegates that customize how the placeholder is processed at later phases of query building:

• MaterializationCheck — invoked at C# materialization time. Used by non-nullable Min/Max/Avg to wrap the column read with a runtime CheckNullValue call that throws on NULL.
• SqlRewriter — invoked at OUTER APPLY lift time (in AggregateExecuteContext.CreateWeakOuterJoin) after UpdateNesting has promoted the inner aggregate to a parent-side column reference, or eagerly for grouped aggregates. Used by non-nullable Sum and StringJoin-family aggregates to wrap the lifted column reference with COALESCE(<ref>, default). The bare aggregate stays in the inner SQL tree during provider validation/ optimization.

At least one of the two delegates is set. Both can be set when an aggregate needs runtime null-check AND late SQL coalesce wrapping; in that case, the conceptual order is: SqlRewriter runs at lift time, then MaterializationCheck at materialization. CanReduce returns false — neither delegate is auto-invoked by visitor reduction; consumers explicitly invoke them at the right hook point.

SqlDefaultIfEmptyExpression

SqlErrorExpression

SqlGenericConstructorExpression

SqlGenericConstructorExpression.Assignment

SqlGenericConstructorExpression.Parameter

SqlGenericParamAccessExpression

SqlPathExpression

SqlPlaceholderExpression

SqlQueryRootExpression

TagExpression

WindowFunctionHelpers

Structs

TransformInfo

WindowFunctionHelpers.WindowFrameSpec

Describes a converted window frame: ROWS/RANGE plus its start and end boundaries. StartMember/EndMember are the WindowFunctionBuilder.IBoundaryPart<TBoundaryDefined> member names — "Unbounded", "CurrentRow", "ValuePreceding", or "ValueFollowing"; the matching value is the offset expression for the Value* members and null otherwise.

Enums

MarkerType

SqlGenericConstructorExpression.CreateType

Defines instance creation approach/method.