protected virtual void OptimizeQueryModel([NotNull] QueryModel queryModel)
{
Check.NotNull(queryModel, nameof(queryModel));
new QueryOptimizer(QueryCompilationContext.QueryAnnotations).VisitQueryModel(queryModel);
var navigationRewritingExpressionTreeVisitor = new NavigationRewritingExpressionVisitor(this);
navigationRewritingExpressionTreeVisitor.Rewrite(queryModel);
var subQueryMemberPushDownExpressionVisitor = new SubQueryMemberPushDownExpressionVisitor();
queryModel.TransformExpressions(subQueryMemberPushDownExpressionVisitor.Visit);
QueryCompilationContext.Logger.LogInformation(queryModel, Strings.LogOptimizedQueryModel);
}
protected override Expression VisitNew(NewExpression expression)
{
Check.NotNull(expression, nameof(expression));
if (expression.Members != null &&
expression.Arguments.Any() &&
expression.Arguments.Count == expression.Members.Count)
{
var memberBindings
= expression.Arguments
.Select(Visit)
.Where(e => e != null)
.ToArray();
if (memberBindings.Length == expression.Arguments.Count)
{
return(Expression.Constant(memberBindings));
}
}
else if (NavigationRewritingExpressionVisitor.IsCompositeKey(expression.Type))
{
var propertyCallExpressions
= ((NewArrayExpression)expression.Arguments.Single()).Expressions;
var memberBindings
= propertyCallExpressions
.Select(Visit)
.Where(e => e != null)
.ToArray();
if (memberBindings.Length == propertyCallExpressions.Count)
{
return(Expression.Constant(memberBindings));
}
}
return(null);
}
