class Arel::Table

def [](name, table = self)
  name = name.to_s if name.is_a?(Symbol)
  name = @klass.attribute_aliases[name] || name if @klass
  Attribute.new(table, name)
end

def able_to_type_cast?
  !type_caster.nil?
end

def alias(name = "#{self.name}_2")
  Nodes::TableAlias.new(self, name)
end

def eql?(other)
  self.class == other.class &&
    self.name == other.name &&
    self.table_alias == other.table_alias
end

def from
  SelectManager.new(self)
end

def group(*columns)
  from.group(*columns)
end

def hash
  # Perf note: aliases and table alias is excluded from the hash
  #  aliases can have a loop back to this table breaking hashes in parent
  #  relations, for the vast majority of cases @name is unique to a query
  @name.hash
end

def having(expr)
  from.having expr
end

def initialize(name, as: nil, klass: nil, type_caster: klass&.type_caster)
  @name = name.to_s
  @klass = klass
  @type_caster = type_caster
  # Sometime AR sends an :as parameter to table, to let the table know
  # that it is an Alias.  We may want to override new, and return a
  # TableAlias node?
  if as.to_s == @name
    as = nil
  end
  @table_alias = as
end

def join(relation, klass = Nodes::InnerJoin)
  return from unless relation
  case relation
  when String, Nodes::SqlLiteral
    raise EmptyJoinError if relation.empty?
    klass = Nodes::StringJoin
  end
  from.join(relation, klass)
end

def order(*expr)
  from.order(*expr)
end

def outer_join(relation)
  join(relation, Nodes::OuterJoin)
end

def project(*things)
  from.project(*things)
end

def skip(amount)
  from.skip amount
end

def take(amount)
  from.take amount
end

def type_cast_for_database(attr_name, value)
  type_caster.type_cast_for_database(attr_name, value)
end

def type_for_attribute(name)
  type_caster.type_for_attribute(name)
end

def where(condition)
  from.where condition
end