module Arel module Visitors class SQLServer def make_Fetch_Possible_And_Deterministic o return if o.limit.nil? && o.offset.nil? t = table_From_Statement o pk = primary_Key_From_Table t return unless pk if o.orders.empty? # Prefer deterministic vs a simple `(SELECT NULL)` expr. # CPK #o.orders = [pk.asc] o.orders = pk.map {|a_pk| a_pk.asc} end end def primary_Key_From_Table t return unless t column_name = @connection.schema_cache.primary_keys(t.name) || @connection.schema_cache.columns_hash(t.name).first.try(:second).try(:name) # CPK # column_name ? t[column_name] : nil case column_name when Array column_name.map do |name| t[name] end when NilClass nil else [t[column_name]] end end end end end