public override void VisitMainFromClause(
[NotNull] MainFromClause fromClause, [NotNull] QueryModel queryModel)
{
Check.NotNull(fromClause, nameof(fromClause));
Check.NotNull(queryModel, nameof(queryModel));
_expression = CompileMainFromClauseExpression(fromClause, queryModel);
var sequenceType = _expression.Type.GetSequenceType();
var elementScoped
= sequenceType.IsConstructedGenericType &&
sequenceType.GetGenericTypeDefinition() == typeof(QueryResultScope <>);
Type elementType;
if (elementScoped)
{
elementType = sequenceType.GetTypeInfo().GenericTypeArguments[0];
}
else
{
elementType = sequenceType;
_expression = CreateScope(_expression, elementType, fromClause);
}
_expression
= Expression.Call(
LinqOperatorProvider.SelectMany
.MakeGenericMethod(typeof(QueryResultScope), typeof(QueryResultScope)),
Expression.Call(
LinqOperatorProvider.ToSequence
.MakeGenericMethod(typeof(QueryResultScope)),
QueryResultScopeParameter),
Expression.Lambda(_expression, QueryResultScopeParameter));
if (!_queryCompilationContext.QuerySourceMapping.ContainsMapping(fromClause))
{
_queryCompilationContext.QuerySourceMapping.AddMapping(
fromClause,
QueryResultScope.GetResult(QueryResultScopeParameter, fromClause, elementType));
}
}
public virtual object GetResult([NotNull] IQuerySource querySource)
=> _querySource == querySource
? UntypedResult
: _parentScope.GetResult(querySource);
private Expression LiftSubQuery(
IQuerySource querySource, Expression itemsExpression, QueryModel queryModel, Expression expression)
{
SelectExpression subSelectExpression;
if (_subqueriesBySource.TryGetValue(querySource, out subSelectExpression) &&
(!subSelectExpression.OrderBy.Any() ||
subSelectExpression.Limit != null))
{
subSelectExpression.PushDownSubquery().QuerySource = querySource;
AddQuery(querySource, subSelectExpression);
_subqueriesBySource.Remove(querySource);
var shapedQueryMethodExpression
= new ShapedQueryFindingExpressionVisitor(QueryCompilationContext)
.Find(expression);
var shaperLambda = (LambdaExpression)shapedQueryMethodExpression.Arguments[2];
var shaperMethodCall = (MethodCallExpression)shaperLambda.Body;
var shaperMethod = shaperMethodCall.Method;
var shaperMethodArgs = shaperMethodCall.Arguments.ToList();
if (!QueryCompilationContext.QuerySourceRequiresMaterialization(querySource) &&
shaperMethod.MethodIsClosedFormOf(RelationalEntityQueryableExpressionVisitor.CreateEntityMethodInfo))
{
shaperMethod = RelationalEntityQueryableExpressionVisitor.CreateValueBufferMethodInfo;
shaperMethodArgs.RemoveRange(5, 5);
}
else
{
subSelectExpression.ExplodeStarProjection();
}
var innerQuerySource = (IQuerySource)((ConstantExpression)shaperMethodArgs[0]).Value;
foreach (var queryAnnotation
in QueryCompilationContext.QueryAnnotations
.Where(qa => qa.QuerySource == innerQuerySource))
{
queryAnnotation.QuerySource = querySource;
}
shaperMethodArgs[0] = Expression.Constant(querySource);
var querySourceReferenceExpression
= queryModel.SelectClause.Selector as QuerySourceReferenceExpression;
if (querySourceReferenceExpression != null &&
querySourceReferenceExpression.ReferencedQuerySource == querySource)
{
var subQueryModel = (itemsExpression as SubQueryExpression)?.QueryModel;
if (subQueryModel != null)
{
queryModel.SelectClause.Selector = subQueryModel.SelectClause.Selector;
QueryCompilationContext.QuerySourceMapping
.ReplaceMapping(
subQueryModel.MainFromClause,
QueryResultScope.GetResult(
QueryResultScopeParameter,
querySource,
shaperMethod.ReturnType.GenericTypeArguments[0]));
}
}
return(Expression.Call(
QueryCompilationContext.QueryMethodProvider.ShapedQueryMethod
.MakeGenericMethod(shaperMethod.ReturnType),
shapedQueryMethodExpression.Arguments[0],
shapedQueryMethodExpression.Arguments[1],
Expression.Lambda(
Expression.Call(shaperMethod, shaperMethodArgs),
shaperLambda.Parameters[0])));
}
return(expression);
}
private Expression LiftSubQuery(
IQuerySource querySource, Expression itemsExpression, QueryModel queryModel, Expression expression)
{
var subQueryExpression = itemsExpression as SubQueryExpression;
if (subQueryExpression == null)
{
return(expression);
}
var subQueryModelVisitor
= (RelationalQueryModelVisitor)QueryCompilationContext.CreateQueryModelVisitor(this);
subQueryModelVisitor.VisitSubQueryModel(subQueryExpression.QueryModel);
SelectExpression subSelectExpression = null;
if (subQueryModelVisitor.Queries.Count == 1 &&
!subQueryModelVisitor.RequiresClientFilter &&
!subQueryModelVisitor.RequiresClientSelectMany &&
!subQueryModelVisitor.RequiresClientProjection &&
!subQueryModelVisitor.RequiresClientResultOperator)
{
subSelectExpression = subQueryModelVisitor.Queries.First();
}
if (subSelectExpression != null &&
(!subSelectExpression.OrderBy.Any() ||
subSelectExpression.Limit != null) &&
(QueryCompilationContext.IsCrossApplySupported ||
(!subSelectExpression.IsCorrelated() ||
!(querySource is AdditionalFromClause))))
{
subSelectExpression.PushDownSubquery().QuerySource = querySource;
AddQuery(querySource, subSelectExpression);
var shapedQueryMethodExpression
= new ShapedQueryFindingExpressionVisitor(QueryCompilationContext)
.Find(subQueryModelVisitor.Expression);
var shaperLambda = (LambdaExpression)shapedQueryMethodExpression.Arguments[2];
var shaperMethodCall = (MethodCallExpression)shaperLambda.Body;
var shaperMethod = shaperMethodCall.Method;
var shaperMethodArgs = shaperMethodCall.Arguments.ToList();
if (!QueryCompilationContext.QuerySourceRequiresMaterialization(querySource) &&
shaperMethod.MethodIsClosedFormOf(RelationalEntityQueryableExpressionVisitor.CreateEntityMethodInfo))
{
shaperMethod = RelationalEntityQueryableExpressionVisitor.CreateValueBufferMethodInfo;
shaperMethodArgs.RemoveRange(5, 5);
}
else
{
subSelectExpression.ExplodeStarProjection();
}
var innerQuerySource = (IQuerySource)((ConstantExpression)shaperMethodArgs[0]).Value;
foreach (var queryAnnotation
in QueryCompilationContext.QueryAnnotations
.Where(qa => qa.QuerySource == innerQuerySource))
{
queryAnnotation.QuerySource = querySource;
}
shaperMethodArgs[0] = Expression.Constant(querySource);
var querySourceReferenceExpression
= queryModel.SelectClause.Selector as QuerySourceReferenceExpression;
if (querySourceReferenceExpression != null &&
querySourceReferenceExpression.ReferencedQuerySource == querySource)
{
if (subQueryExpression.QueryModel != null)
{
queryModel.SelectClause.Selector = subQueryExpression.QueryModel.SelectClause.Selector;
QueryCompilationContext.QuerySourceMapping
.ReplaceMapping(
subQueryExpression.QueryModel.MainFromClause,
QueryResultScope.GetResult(
QueryResultScopeParameter,
querySource,
shaperMethod.ReturnType.GenericTypeArguments[0]));
}
}
return(Expression.Call(
QueryCompilationContext.QueryMethodProvider.ShapedQueryMethod
.MakeGenericMethod(shaperMethod.ReturnType),
shapedQueryMethodExpression.Arguments[0],
shapedQueryMethodExpression.Arguments[1],
Expression.Lambda(
Expression.Call(shaperMethod, shaperMethodArgs),
shaperLambda.Parameters[0])));
}
return(expression);
}
public override void VisitGroupJoinClause(
[NotNull] GroupJoinClause groupJoinClause, [NotNull] QueryModel queryModel, int index)
{
Check.NotNull(groupJoinClause, nameof(groupJoinClause));
Check.NotNull(queryModel, nameof(queryModel));
var outerKeySelector
= ReplaceClauseReferences(groupJoinClause.JoinClause.OuterKeySelector, groupJoinClause);
var innerExpression
= CompileGroupJoinInnerSequenceExpression(groupJoinClause, queryModel);
var innerSequenceType
= innerExpression.Type.GetSequenceType();
var innerItemParameter
= Expression.Parameter(innerSequenceType);
var innerElementScoped
= innerSequenceType.IsConstructedGenericType &&
innerSequenceType.GetGenericTypeDefinition() == typeof(QueryResultScope <>);
Type innerElementType;
var querySourceMapping = _queryCompilationContext.QuerySourceMapping;
if (innerElementScoped)
{
innerElementType = innerSequenceType.GetTypeInfo().GenericTypeArguments[0];
querySourceMapping.AddMapping(
groupJoinClause.JoinClause,
QueryResultScope.GetResult(innerItemParameter, groupJoinClause.JoinClause, innerElementType));
}
else
{
innerElementType = innerSequenceType;
querySourceMapping.AddMapping(groupJoinClause.JoinClause, innerItemParameter);
}
var innerKeySelector
= ReplaceClauseReferences(groupJoinClause.JoinClause.InnerKeySelector, groupJoinClause);
var innerItemsParameter
= Expression.Parameter(innerExpression.Type);
_expression
= Expression.Call(
LinqOperatorProvider.GroupJoin.MakeGenericMethod(
typeof(QueryResultScope),
innerSequenceType,
outerKeySelector.Type,
typeof(QueryResultScope)),
_expression,
innerExpression,
Expression.Lambda(outerKeySelector, QueryResultScopeParameter),
Expression.Lambda(innerKeySelector, innerItemParameter),
Expression.Lambda(
QueryResultScope
.Create(
groupJoinClause,
innerElementScoped
? Expression.Call(
LinqOperatorProvider.Select
.MakeGenericMethod(
innerSequenceType,
innerElementType),
innerItemsParameter,
Expression.Lambda(
QueryResultScope.GetResult(
innerItemParameter,
groupJoinClause.JoinClause,
innerElementType),
innerItemParameter))
: (Expression)innerItemsParameter,
QueryResultScopeParameter),
QueryResultScopeParameter, innerItemsParameter));
var expressionTypeInfo = _expression.Type.GetTypeInfo();
querySourceMapping.AddMapping(
groupJoinClause,
QueryResultScope
.GetResult(
QueryResultScopeParameter,
groupJoinClause,
expressionTypeInfo.GetGenericTypeDefinition()
.MakeGenericType(innerElementType)));
}