public virtual IEnumerable <ExpressionVisitor> CreateExpressionVisitors(QueryProcessingContext context)
{
yield return(new KeyEqualityComposingExpressionVisitor(context.DescriptorSet));
yield return(new NavigationComposingExpressionVisitor(context.DescriptorSet.NavigationDescriptors));
yield return(new TableAliasComposingExpressionVisitor());
yield return(new QueryComposingExpressionVisitor(
translatabilityAnalyzingExpressionVisitor,
rewritingExpressionVisitorProvider.CreateExpressionVisitors(context),
new SqlParameterRewritingExpressionVisitor(context.ParameterMapping.Values)));
}
public virtual IEnumerable <ExpressionVisitor> CreateExpressionVisitors(QueryProcessingContext context)
{
// Before any composition, extract the 'query options'
// (AsTracking, AsNoTracking, IgnoreQueryFilters)
yield return(new QueryOptionsAnnotatingExpressionVisitor());
// This visitor ensures that EF.Property calls to non-shadow properties/navigations
// are rewritten into plain member accesses that the navigation visitor can rewrite.
yield return(new ShadowPropertyRewritingExpressionVisitor(currentDbContext.Context.Model));
// The include composing visitor rewrites the calls to Include
// into calls to Select that re-materialize the entity while assigning
// a navigation property to themselves, so that the navigation composing
// visitor can then rewrite those into appropriate joins/etc.
yield return(new KeyEqualityComposingExpressionVisitor(context.DescriptorSet));
yield return(new NavigationComposingExpressionVisitor(context.DescriptorSet.NavigationDescriptors));
yield return(new OwnedTypeIncludeComposingExpressionVisitor(currentDbContext.Context.Model));
yield return(new IncludeComposingExpressionVisitor(currentDbContext.Context.Model, context.DescriptorSet));
yield return(new NavigationComposingExpressionVisitor(context.DescriptorSet.NavigationDescriptors));
yield return(new TableAliasComposingExpressionVisitor());
// Now that the really 'meaty' compositions have taken place,
// go back with the query options and apply them (by removing
// query filter expressions, setting the EntityState to use
// within materialization expressions, etc.
yield return(new QueryOptionsComposingExpressionVisitor());
// Compose the actual relational query from the modified tree
yield return(new QueryComposingExpressionVisitor(
translatabilityAnalyzingExpressionVisitor,
rewritingExpressionVisitorProvider.CreateExpressionVisitors(context),
providerSpecificRewritingExpressionVisitor.CreateExpressionVisitors(context),
new SqlParameterRewritingExpressionVisitor(context.ParameterMapping.Values)));
// Apply possible relational null semantics after the whole query is composed
// but before it is compiled
yield return(new RelationalNullSemanticsComposingExpressionVisitor());
}