private static Expression HandleAll(HandlerContext handlerContext)
{
var filteringVisitor
= new SqlTranslatingExpressionTreeVisitor(handlerContext.QueryModelVisitor);
var predicate
= filteringVisitor.VisitExpression(
((AllResultOperator)handlerContext.ResultOperator).Predicate);
if (predicate != null)
{
var innerSelectExpression = new SelectExpression();
innerSelectExpression.AddTables(handlerContext.SelectExpression.Tables);
innerSelectExpression.Predicate = Expression.Not(predicate);
SetProjectionCaseExpression(
handlerContext,
new CaseExpression(Expression.Not(new ExistsExpression(innerSelectExpression))));
return(TransformClientExpression <bool>(handlerContext));
}
return(handlerContext.EvalOnClient);
}
public RelationalProjectionExpressionTreeVisitor(
[NotNull] RelationalQueryModelVisitor queryModelVisitor,
[NotNull] IQuerySource querySource)
: base(Check.NotNull(queryModelVisitor, nameof(queryModelVisitor)))
{
_querySource = querySource;
_sqlTranslatingExpressionTreeVisitor
= new SqlTranslatingExpressionTreeVisitor(queryModelVisitor);
}
public override void VisitOrderByClause(OrderByClause orderByClause, QueryModel queryModel, int index)
{
var selectExpression = TryGetQuery(queryModel.MainFromClause);
var requiresClientOrderBy = selectExpression == null;
if (!requiresClientOrderBy)
{
var sqlTranslatingExpressionTreeVisitor
= new SqlTranslatingExpressionTreeVisitor(this);
var orderings = new List <Ordering>();
foreach (var ordering in orderByClause.Orderings)
{
var sqlOrderingExpression
= sqlTranslatingExpressionTreeVisitor
.VisitExpression(ordering.Expression);
if (sqlOrderingExpression == null)
{
break;
}
orderings.Add(
new Ordering(
sqlOrderingExpression,
ordering.OrderingDirection));
}
if (orderings.Count == orderByClause.Orderings.Count)
{
selectExpression.PrependToOrderBy(orderings);
}
else
{
requiresClientOrderBy = true;
}
}
if (RequiresClientEval | requiresClientOrderBy)
{
base.VisitOrderByClause(orderByClause, queryModel, index);
}
}
public override void VisitWhereClause(WhereClause whereClause, QueryModel queryModel, int index)
{
var selectExpression = TryGetQuery(queryModel.MainFromClause);
var requiresClientEval = selectExpression == null;
if (!requiresClientEval)
{
var translatingVisitor = new SqlTranslatingExpressionTreeVisitor(this, whereClause.Predicate);
var sqlPredicateExpression = translatingVisitor.VisitExpression(whereClause.Predicate);
if (sqlPredicateExpression != null)
{
selectExpression.Predicate
= selectExpression.Predicate == null
? sqlPredicateExpression
: Expression.AndAlso(selectExpression.Predicate, sqlPredicateExpression);
}
else
{
requiresClientEval = true;
}
if (translatingVisitor.ClientEvalPredicate != null)
{
requiresClientEval = true;
whereClause = new WhereClause(translatingVisitor.ClientEvalPredicate);
}
}
if (requiresClientEval)
{
base.VisitWhereClause(whereClause, queryModel, index);
}
_requiresClientFilter |= requiresClientEval;
}
public override void VisitJoinClause(JoinClause joinClause, QueryModel queryModel, int index)
{
var previousQuerySource
= index == 0
? queryModel.MainFromClause
: queryModel.BodyClauses[index - 1] as IQuerySource;
var previousSelectExpression
= previousQuerySource != null
? TryGetQuery(previousQuerySource)
: null;
var previousSelectProjectionCount
= previousSelectExpression?.Projection.Count ?? -1;
base.VisitJoinClause(joinClause, queryModel, index);
if (previousSelectExpression != null)
{
var selectExpression = TryGetQuery(joinClause);
if (selectExpression != null)
{
var filteringExpressionTreeVisitor
= new SqlTranslatingExpressionTreeVisitor(this);
var predicate
= filteringExpressionTreeVisitor
.VisitExpression(
Expression.Equal(
joinClause.OuterKeySelector,
joinClause.InnerKeySelector));
if (predicate != null)
{
_queriesBySource.Remove(joinClause);
previousSelectExpression.RemoveRangeFromProjection(previousSelectProjectionCount);
var innerJoinExpression
= previousSelectExpression
.AddInnerJoin(
selectExpression.Tables.Single(),
QuerySourceRequiresMaterialization(joinClause)
? selectExpression.Projection
: Enumerable.Empty <Expression>());
innerJoinExpression.Predicate = predicate;
Expression
= new QueryFlatteningExpressionTreeVisitor(
previousQuerySource,
joinClause,
QueryCompilationContext,
previousSelectProjectionCount,
LinqOperatorProvider.Join)
.VisitExpression(Expression);
}
else
{
previousSelectExpression.RemoveRangeFromProjection(previousSelectProjectionCount);
}
}
}
}
