private static Expression HandleAll(HandlerContext handlerContext)
{
var filteringVisitor
= new SqlTranslatingExpressionVisitor(
handlerContext.QueryModelVisitor,
handlerContext.SelectExpression);
var predicate
= filteringVisitor.Visit(
((AllResultOperator)handlerContext.ResultOperator).Predicate);
if (predicate != null)
{
var innerSelectExpression = new SelectExpression();
innerSelectExpression.AddTables(handlerContext.SelectExpression.Tables);
innerSelectExpression.Predicate = Expression.Not(predicate);
SetProjectionConditionalExpression(
handlerContext,
Expression.Condition(
Expression.Not(new ExistsExpression(innerSelectExpression)),
Expression.Constant(true),
Expression.Constant(false),
typeof(bool)));
return(TransformClientExpression <bool>(handlerContext));
}
return(handlerContext.EvalOnClient);
}
public override void VisitWhereClause(WhereClause whereClause, QueryModel queryModel, int index)
{
if (Expression is QueryShaperExpression queryShaperExpression)
{
if (queryShaperExpression.QueryExpression is DocumentQueryExpression documentQueryExpression)
{
var selectExpression = documentQueryExpression.SelectExpression;
var sqlTranslatingExpressionVisitor = new SqlTranslatingExpressionVisitor(
selectExpression, QueryCompilationContext);
var sqlPredicate = sqlTranslatingExpressionVisitor.Visit(whereClause.Predicate);
if (sqlTranslatingExpressionVisitor.Translated)
{
selectExpression.AddToPredicate(sqlPredicate);
return;
}
}
if (AllMembersBoundToJObject)
{
var fromClause = queryModel.MainFromClause;
var previousParameterType = CurrentParameter.Type;
// Temporarily change current parameter to JObject to try binding to it without materializing the entity
UpdateCurrentParameter(fromClause, typeof(JObject));
var predicate = ReplaceClauseReferences(whereClause.Predicate);
if (AllMembersBoundToJObject)
{
Expression = new QueryShaperExpression(
QueryCompilationContext.IsAsyncQuery,
Expression.Call(
LinqOperatorProvider.Where.MakeGenericMethod(CurrentParameter.Type),
queryShaperExpression.QueryExpression,
Expression.Lambda(predicate, CurrentParameter)),
queryShaperExpression.Shaper);
if (CurrentParameter.Type == typeof(JObject))
{
UpdateCurrentParameter(fromClause, previousParameterType);
}
return;
}
UpdateCurrentParameter(fromClause, previousParameterType);
}
}
base.VisitWhereClause(whereClause, queryModel, index);
}
public override void VisitOrderByClause(OrderByClause orderByClause, QueryModel queryModel, int index)
{
Check.NotNull(orderByClause, nameof(orderByClause));
Check.NotNull(queryModel, nameof(queryModel));
var selectExpression = TryGetQuery(queryModel.MainFromClause);
var requiresClientOrderBy = selectExpression == null;
if (!requiresClientOrderBy)
{
var sqlTranslatingExpressionVisitor
= new SqlTranslatingExpressionVisitor(
this, selectExpression, bindParentQueries: _bindParentQueries);
var orderings = new List <Ordering>();
foreach (var ordering in orderByClause.Orderings)
{
var sqlOrderingExpression
= sqlTranslatingExpressionVisitor
.Visit(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)
{
Check.NotNull(whereClause, nameof(whereClause));
Check.NotNull(queryModel, nameof(queryModel));
var selectExpression = TryGetQuery(queryModel.MainFromClause);
var requiresClientFilter = selectExpression == null;
if (!requiresClientFilter)
{
var sqlTranslatingExpressionVisitor
= new SqlTranslatingExpressionVisitor(
this, selectExpression, whereClause.Predicate, _bindParentQueries);
var sqlPredicateExpression = sqlTranslatingExpressionVisitor.Visit(whereClause.Predicate);
if (sqlPredicateExpression != null)
{
selectExpression.Predicate
= selectExpression.Predicate == null
? sqlPredicateExpression
: Expression.AndAlso(selectExpression.Predicate, sqlPredicateExpression);
}
else
{
requiresClientFilter = true;
}
if (sqlTranslatingExpressionVisitor.ClientEvalPredicate != null &&
selectExpression.Predicate != null)
{
requiresClientFilter = true;
whereClause = new WhereClause(sqlTranslatingExpressionVisitor.ClientEvalPredicate);
}
}
_requiresClientFilter |= requiresClientFilter;
if (RequiresClientFilter)
{
base.VisitWhereClause(whereClause, queryModel, index);
}
}
public override void VisitWhereClause(WhereClause whereClause, QueryModel queryModel, int index)
{
if (Expression is QueryShaperExpression queryShaperExpression &&
queryShaperExpression.QueryExpression is DocumentQueryExpression documentQueryExpression)
{
var selectExpression = documentQueryExpression.SelectExpression;
var sqlTranslatingExpressionVisitor = new SqlTranslatingExpressionVisitor(
selectExpression, QueryCompilationContext);
var sqlPredicate = sqlTranslatingExpressionVisitor.Visit(whereClause.Predicate);
if (sqlPredicate != null)
{
selectExpression.AddToPredicate(sqlPredicate);
return;
}
}
base.VisitWhereClause(whereClause, queryModel, index);
}
public override void VisitWhereClause(WhereClause whereClause, QueryModel queryModel, int index)
{
Debug.Assert(Expression is QueryShaperExpression, "Invalid Expression encountered");
var queryShaperExpression = (QueryShaperExpression)Expression;
if (queryShaperExpression.QueryExpression is DocumentQueryExpression documentQueryExpression)
{
var selectExpression = documentQueryExpression.SelectExpression;
var sqlTranslatingExpressionVisitor = new SqlTranslatingExpressionVisitor(
selectExpression, QueryCompilationContext);
var sqlPredicate = sqlTranslatingExpressionVisitor.Visit(whereClause.Predicate);
if (sqlPredicate != null)
{
selectExpression.AddToPredicate(sqlPredicate);
return;
}
}
var fromClause = queryModel.MainFromClause;
// Change current parameter to JObject
UpdateCurrentParameter(fromClause, typeof(JObject));
var predicate = ReplaceClauseReferences(whereClause.Predicate);
Expression = new QueryShaperExpression(
Expression.Call(LinqOperatorProvider.Where.MakeGenericMethod(CurrentParameter.Type),
queryShaperExpression.QueryExpression,
Expression.Lambda(predicate, CurrentParameter)),
queryShaperExpression.Shaper);
UpdateCurrentParameter(fromClause, Expression.Type.TryGetSequenceType());
//base.VisitWhereClause(whereClause, queryModel, index);
}
public override void VisitJoinClause(JoinClause joinClause, QueryModel queryModel, int index)
{
Check.NotNull(joinClause, nameof(joinClause));
Check.NotNull(queryModel, nameof(queryModel));
var previousQuerySource = FindPreviousQuerySource(queryModel, index);
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 filteringExpressionVisitor
= new SqlTranslatingExpressionVisitor(this, targetSelectExpression: null);
var predicate
= filteringExpressionVisitor
.Visit(
Expression.Equal(
joinClause.OuterKeySelector,
joinClause.InnerKeySelector));
if (predicate != null)
{
_queriesBySource.Remove(joinClause);
previousSelectExpression.RemoveRangeFromProjection(previousSelectProjectionCount);
var innerJoinExpression
= previousSelectExpression
.AddInnerJoin(
selectExpression.Tables.Single(),
QueryCompilationContext
.QuerySourceRequiresMaterialization(joinClause)
? selectExpression.Projection
: Enumerable.Empty <Expression>());
innerJoinExpression.Predicate = predicate;
Expression
= new QueryFlatteningExpressionVisitor(
previousQuerySource,
joinClause,
QueryCompilationContext,
previousSelectProjectionCount,
LinqOperatorProvider.Join)
.Visit(Expression);
}
else
{
previousSelectExpression.RemoveRangeFromProjection(previousSelectProjectionCount);
}
}
}
}
protected virtual void OptimizeJoinClause(
[NotNull] JoinClause joinClause,
[NotNull] QueryModel queryModel,
int index,
[NotNull] Action baseVisitAction,
[NotNull] MethodInfo operatorToFlatten,
bool outerJoin = false)
{
Check.NotNull(joinClause, nameof(joinClause));
Check.NotNull(queryModel, nameof(queryModel));
Check.NotNull(baseVisitAction, nameof(baseVisitAction));
Check.NotNull(operatorToFlatten, nameof(operatorToFlatten));
var previousQuerySource = FindPreviousQuerySource(queryModel, index);
var previousSelectExpression
= previousQuerySource != null
? TryGetQuery(previousQuerySource)
: null;
var previousSelectProjectionCount
= previousSelectExpression?.Projection.Count ?? -1;
baseVisitAction();
if (previousSelectExpression != null)
{
var selectExpression = TryGetQuery(joinClause);
if (selectExpression != null)
{
var sqlTranslatingExpressionVisitor = new SqlTranslatingExpressionVisitor(this);
var predicate
= sqlTranslatingExpressionVisitor
.Visit(
Expression.Equal(
joinClause.OuterKeySelector,
joinClause.InnerKeySelector));
if (predicate != null)
{
_queriesBySource.Remove(joinClause);
previousSelectExpression.RemoveRangeFromProjection(previousSelectProjectionCount);
var tableExpression = selectExpression.Tables.Single();
var projection
= QueryCompilationContext
.QuerySourceRequiresMaterialization(joinClause)
? selectExpression.Projection
: Enumerable.Empty <Expression>();
var joinExpression
= !outerJoin
? previousSelectExpression.AddInnerJoin(tableExpression, projection)
: previousSelectExpression.AddOuterJoin(tableExpression, projection);
joinExpression.Predicate = predicate;
Expression
= new QueryFlatteningExpressionVisitor(
previousQuerySource,
joinClause,
QueryCompilationContext,
previousSelectProjectionCount,
operatorToFlatten)
.Visit(Expression);
}
else
{
previousSelectExpression
.RemoveRangeFromProjection(previousSelectProjectionCount);
}
}
}
}