protected internal override Node VisitApplySource([NotNull] ApplySource node)
{
this.Visit(node.Left);
this.Builder.Append(" " + (node.IsOuterApply ? "OUTER" : "CROSS") + " ");
this.Visit(node.Right);
return(node);
}
protected internal override Node VisitApplySource(ApplySource node)
{
node = (ApplySource)base.VisitApplySource(node);
Expression factory = Expression.Constant(null, typeof(Func <Row, DataSource>));
var left = this.data.GetFactoryExpression(node.Left);
var right = this.data.GetFactoryExpression(node.Right);
var row = Expression.Parameter(typeof(Row), "row");
var replaced = GenericVisitor.Visit(
(SourceFieldExpression e) => Expression.Call(row, NodeDataProviderDataSourceConverter.GetMethod.MakeGenericMethod(e.Type), Expression.Constant($"{e.SourceName}.{e.FieldName}")),
(UnaryExpression e) => e.NodeType == ExpressionType.Convert && e.Operand is SourceFieldExpression
? Expression.Call(row, NodeDataProviderDataSourceConverter.GetMethod.MakeGenericMethod(e.Type), Expression.Constant($"{((SourceFieldExpression)e.Operand).SourceName}.{((SourceFieldExpression)e.Operand).FieldName}"))
: null,
right);
if (!ReferenceEquals(replaced, right))
{
factory = Expression.Constant(right);
right = GenericVisitor.Visit(
(SourceFieldExpression e) => Expression.Default(e.Type),
(UnaryExpression e) => e.NodeType == ExpressionType.Convert && e.Operand is SourceFieldExpression
? Expression.Default(e.Type)
: null,
right);
}
var apply =
node.IsOuterApply
? Evaluator.CreateJoin(
typeof(OuterApply).GetTypeInfo().DeclaredConstructors.First(),
left,
right,
factory)
: Evaluator.CreateJoin(
typeof(CrossApply).GetTypeInfo().DeclaredConstructors.First(),
left,
right,
factory);
this.data.SetFactoryExpression(node, apply);
return(node);
}
/// <summary>
/// Visits a <see cref="ApplySource"/>.
/// </summary>
/// <param name="node">
/// The node.
/// </param>
/// <returns>
/// The node, or a new version of the node.
/// </returns>
protected internal virtual Node VisitApplySource([NotNull] ApplySource node)
{
return(node.VisitChildren(this));
}
/// <summary>
/// Visits a <see cref="ApplySource"/>.
/// </summary>
/// <param name="node">
/// The node.
/// </param>
/// <returns>
/// The node, or a new version of the node.
/// </returns>
protected internal override Node VisitApplySource(ApplySource node)
{
return(this.VisitImplementation(node) ?? base.VisitApplySource(node));
}
