module ActiveRecord::ConnectionAdapters::PostgreSQL::Quoting

def quote_table_name(name) # :nodoc:

:nodoc:
- "schema.name"."table.name"
- "schema.name".table_name
- schema_name."table.name"
- schema_name.table_name
- "table.name"
- table_name

Checks the following cases:
def quote_table_name(name) # :nodoc:
  self.class.quoted_table_names[name] ||= Utils.extract_schema_qualified_name(name.to_s).quoted.freeze
end