protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
HashSet <string> columnsUsed = allColumnsUsed.GetOrCreate(set.Alias); // a veces no se usa
allColumnsUsed.GetOrCreate(set.Left.Alias).AddRange(columnsUsed);
allColumnsUsed.GetOrCreate(set.Right.Alias).AddRange(columnsUsed);
return(base.VisitSetOperator(set));
}
protected internal virtual Expression VisitSetOperator(SetOperatorExpression set)
{
SourceWithAliasExpression left = (SourceWithAliasExpression)this.VisitSource(set.Left) !;
SourceWithAliasExpression right = (SourceWithAliasExpression)this.VisitSource(set.Right) !;
if (left != set.Left || right != set.Right)
{
return(new SetOperatorExpression(set.Operator, left, right, set.Alias));
}
return(set);
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
SourceWithAliasExpression left = (SourceWithAliasExpression)this.VisitSource(set.Left) !;
SourceWithAliasExpression right = (SourceWithAliasExpression)this.VisitSource(set.Right) !;
Alias newAlias = aliasMap.TryGetC(set.Alias) ?? set.Alias;
if (left != set.Left || right != set.Right || newAlias != set.Alias)
{
return(new SetOperatorExpression(set.Operator, left, right, newAlias));
}
return(set);
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
List <ColumnExpression> askedColumns = CurrentScope.Keys.Where(k => k.Alias == set.Alias).ToList();
SourceWithAliasExpression left = VisitSetOperatorPart(set.Left, askedColumns);
SourceWithAliasExpression right = VisitSetOperatorPart(set.Right, askedColumns);
CurrentScope.SetRange(askedColumns, askedColumns);
if (left != set.Left || right != set.Right)
{
return(new SetOperatorExpression(set.Operator, left, right, set.Alias));
}
return(set);
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
var result = (SetOperatorExpression)base.VisitSetOperator(set);
if (this.redundant != null)
{
if (result.Left is SelectExpression l)
{
this.redundant.Remove(l);
}
if (result.Right is SelectExpression r)
{
this.redundant.Remove(r);
}
}
return(result);
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
VisitSetPart(set.Left);
switch (set.Operator)
{
case SetOperator.Union: sb.Append("UNION"); break;
case SetOperator.UnionAll: sb.Append("UNION ALL"); break;
case SetOperator.Intersect: sb.Append("INTERSECT"); break;
case SetOperator.Except: sb.Append("EXCEPT"); break;
default:
throw new InvalidOperationException("Unexpected SetOperator {0}".FormatWith(set.Operator));
}
VisitSetPart(set.Right);
return(set);
}
protected virtual bool CompareSetOperator(SetOperatorExpression a, SetOperatorExpression b)
{
if (a.Operator != b.Operator)
{
return(false);
}
if (!CompareAlias(a.Alias, b.Alias))
{
return(false);
}
if (!Compare(a.Left, b.Left))
{
return(false);
}
if (!Compare(a.Right, b.Right))
{
return(false);
}
return(true);
}
private static IEnumerable <ColumnExpression> KeysSet(SetOperatorExpression set)
{
return(Keys(set.Left).Concat(Keys(set.Right)));
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
using (Scope())
return(base.VisitSetOperator(set));
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
this.aliases.Add(set.Alias);
return(base.VisitSetOperator(set));
}
