/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public override Expression Visit(Expression expression)
{
if (expression == null)
{
return(null);
}
if (expression is NewExpression ||
expression is MemberInitExpression ||
expression is EntityShaperExpression)
{
return(base.Visit(expression));
}
// This skips the group parameter from GroupJoin
if (expression is ParameterExpression parameter &&
parameter.Type.IsGenericType &&
parameter.Type.GetGenericTypeDefinition() == typeof(IEnumerable <>))
{
return(parameter);
}
if (_clientEval)
{
switch (expression)
{
case ConstantExpression _:
return(expression);
case ParameterExpression parameterExpression:
if (_collectionShaperMapping.ContainsKey(parameterExpression))
{
return(parameterExpression);
}
return(Expression.Call(
_getParameterValueMethodInfo.MakeGenericMethod(parameterExpression.Type),
QueryCompilationContext.QueryContextParameter,
Expression.Constant(parameterExpression.Name)));
case MaterializeCollectionNavigationExpression _:
return(base.Visit(expression));
}
var translation = _sqlTranslator.Translate(expression);
if (translation == null)
{
return(base.Visit(expression));
}
return(new ProjectionBindingExpression(
_selectExpression, _selectExpression.AddToProjection(translation), expression.Type));
}
else
{
var translation = _sqlTranslator.Translate(expression);
if (translation == null)
{
return(null);
}
_projectionMapping[_projectionMembers.Peek()] = translation;
return(new ProjectionBindingExpression(_selectExpression, _projectionMembers.Peek(), expression.Type));
}
}
private SqlExpression TranslateExpression(Expression expression) => _sqlTranslator.Translate(expression);