columns

# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 225
        def columns(table_name) # :nodoc:
          table_name = table_name.to_s
          column_definitions(table_name).map do |column_name, type, default, notnull, oid, fmod, collation, comment|
            oid = oid.to_i
            fmod = fmod.to_i
            type_metadata = fetch_type_metadata(column_name, type, oid, fmod)
            default_value = extract_value_from_default(default)
            default_function = extract_default_function(default_value, default)
            new_column(column_name, default_value, type_metadata, !notnull, table_name, default_function, collation, comment: comment.presence)
          end
        end