protected SqlSelectInfo Join <TJoin>(JoinType joinType, ISqlFilter condition, SqlAlias <TJoin> joinAlias = null)
{
if (condition == null)
{
throw new ArgumentNullException(nameof(condition));
}
if (joinAlias == null)
{
joinAlias = MetadataProvider.AliasFor <TJoin>();
}
if (Info.Joins().Any(j => j.JoinAlias.Value == joinAlias.Value))
{
throw new JoinException($"Alias '{joinAlias.Value}' is already registered");
}
var join = new SqlJoin <TJoin>(joinType, condition, joinAlias);
return(Info.Joins(join));
}