You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: relation.rb
    path of file: ./repos/torque-postgresql/lib/torque/postgresql
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative 'relation/distinct_on'
require_relative 'relation/auxiliary_statement'
require_relative 'relation/inheritance'

require_relative 'relation/merger'

module Torque
  module PostgreSQL
    module Relation
      extend ActiveSupport::Concern

      include DistinctOn
      include AuxiliaryStatement
      include Inheritance

      SINGLE_VALUE_METHODS = [:itself_only]
      MULTI_VALUE_METHODS = [:distinct_on, :auxiliary_statements, :cast_records, :select_extra]
      VALUE_METHODS = SINGLE_VALUE_METHODS + MULTI_VALUE_METHODS

      ARColumn = ::ActiveRecord::ConnectionAdapters::PostgreSQL::Column

      # :nodoc:
      def select_extra_values; get_value(:select_extra); end
      # :nodoc:
      def select_extra_values=(value); set_value(:select_extra, value); end

      # Resolve column name when calculating models, allowing the column name to
      # be more complex while keeping the query selection quality
      def calculate(operation, column_name)
        column_name = resol
    
      def select_extra_values; get_value(:select_extra); end
      # :nodoc:
      def select_extra_values=(value); set_value(:select_extra, value); end

      # Resolve column name when calculating models, allowing the column name to
      # be more complex while keeping the query selection quality
      def calculate(operation, column_name)
        column_name = resolve_column(column_name).first if column_name.is_a?(Hash)
        super(operation, column_name)
      end

      # Resolve column definition up to second value.
      # For example, based on Post model:
      #
      #   resolve_column(['name', :title])
      #   # Returns ['name', '"posts"."title"']
      #
      #   resolve_column([:title, {authors: :name}])
      #   # Returns ['"posts"."title"', '"authors"."name"']
      #
      #   resolve_column([{authors: [:name, :age]}])
      #   # Returns ['"authors"."name"', '"authors"."age"']
      def resolve_column(list, base = false)
        base = resolve_base_table(base)

        Array.wrap(list).map do |item|
          case item
          when String
            ::Arel.sql(klass.send(:sanitize_sql, item.to_s))
          when Symbol
            base ? base.arel_table[item] : klass.arel_table[item]
          when Array
            resolve_column(item, base)
          when Hash
            raise ArgumentError, 'Unsupported Hash for attributes on third level' if base
            item.map { |key, other_list| resolve_column(other_list, key) }
          else
            raise ArgumentError, "Unsupported argument type: #{value} (#{value.class})"
          end
        end.flatten
      end

      # Get the TableMetadata from a relation
      def resolve_base_table(relation)
        return unless relation

        table = predicate_builder.send(:table)
        if table.associated_with?(relation.to_s)
          table.associated_table(relation.to_s).send(:klass)
        else
          raise ArgumentError, "Relation for #{relation} not found on #{klass}"
        end
      end

      # Serialize the given value so it can be used in a condition tha involves
      # the given column
      def cast_for_condition(column, value)
        column = columns_hash[column.to_s] unless column.is_a?(ARColumn)
        caster = connection.lookup_cast_type_from_column(column)
        connection.type_cast(caster.serialize(value))
      end

      private

        def build_arel(*)
          arel = super
          arel.project(*select_extra_values) if select_values.blank?
          arel
        end

        # Compatibility method with 5.0
        unless ActiveRecord::Relation.method_defined?(:get_value)
          def get_value(name)
            @values[name] || ActiveRecord::QueryMethods::FROZEN_EMPTY_ARRAY
          end
        end