Fix Rails SQL Server Adapter when using Arel::Nodes::TableAlias

sql_server.rb

# frozen_string_literal: true

module Arel
  module Visitors
    class SQLServer < Arel::Visitors::ToSql

      def table_From_Statement o
        core = o.cores.first

        table_From_Node(core.from) || table_From_Node(core.source)
      end

      def table_From_Node n
        case n
        when Arel::Table              then n
        when Arel::Nodes::TableAlias  then n
        when Arel::Nodes::SqlLiteral  then Arel::Table.new(n)
        when Arel::Nodes::JoinSource  then table_From_Node(n.left) || table_From_Node(n.right)
        end
      end
    end
  end
end