public override void VisitAdditionalFromClause(AdditionalFromClause fromClause, QueryModel queryModel, int index)
{
base.VisitAdditionalFromClause(fromClause, queryModel, index);
var selectExpression = TryGetQuery(fromClause);
if (selectExpression != null)
{
var previousQuerySource
= index == 0
? queryModel.MainFromClause
: queryModel.BodyClauses[index - 1] as IQuerySource;
if (previousQuerySource != null)
{
var previousSelectExpression = TryGetQuery(previousQuerySource);
if (previousSelectExpression != null)
{
var readerOffset = previousSelectExpression.Projection.Count;
previousSelectExpression
.AddCrossJoin(selectExpression.Tables.Single(), selectExpression.Projection);
_queriesBySource.Remove(fromClause);
Expression
= new QueryFlatteningExpressionTreeVisitor(
previousQuerySource,
fromClause,
QueryCompilationContext,
readerOffset,
LinqOperatorProvider.SelectMany)
.VisitExpression(Expression);
}
}
}
}
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);
}
}
}
}
