Syntax:
RESIGNAL [condition_value]
    [SET signal_information_item
    [, signal_information_item] ...]

condition_value:
    SQLSTATE [VALUE] sqlstate_value
  | condition_name

signal_information_item:
    condition_information_item_name = simple_value_specification

condition_information_item_name:
    CLASS_ORIGIN
  | SUBCLASS_ORIGIN
  | MESSAGE_TEXT
  | MYSQL_ERRNO
  | CONSTRAINT_CATALOG
  | CONSTRAINT_SCHEMA
  | CONSTRAINT_NAME
  | CATALOG_NAME
  | SCHEMA_NAME
  | TABLE_NAME
  | COLUMN_NAME
  | CURSOR_NAME

condition_name, simple_value_specification:
    (see following discussion)

RESIGNAL passes on the error condition information that is available
during execution of a condition handler within a compound statement
inside a stored procedure or function, trigger, or event. RESIGNAL may
change some or all information before passing it on. RESIGNAL is
related to SIGNAL, but instead of originating a condition as SIGNAL
does, RESIGNAL relays existing condition information, possibly after
modifying it.

RESIGNAL makes it possible to both handle an error and return the error
information. Otherwise, by executing an SQL statement within the
handler, information that caused the handler's activation is destroyed.
RESIGNAL also can make some procedures shorter if a given handler can
handle part of a situation, then pass the condition "up the line" to
another handler.

No special privileges are required to execute the RESIGNAL statement.

For condition_value and signal_information_item, the definitions and
rules are the same for RESIGNAL as for SIGNAL (see [HELP SIGNAL]).

The RESIGNAL statement takes condition_value and SET clauses, both of
which are optional. This leads to several possible uses:

o RESIGNAL alone:

RESIGNAL;

o RESIGNAL with new signal information:

RESIGNAL SET signal_information_item [, signal_information_item] ...;

o RESIGNAL with a condition value and possibly new signal information:

RESIGNAL condition_value
    [SET signal_information_item [, signal_information_item] ...];

URL: https://mariadb.com/kb/en/resignal/

