If having use a procedure, then in another connection, this procedure is changed (removing one parameter), a call to INFORMATION_SCHEMA.parameters will not reflect the changes in the the first connection.

example to reproduce :
create procedure :

create or replace procedure metaChange(p1 int, p2 int)

BEGIN

  select p1 as 'p1';

END

The failing scenario:

• connection 1 : execute

  call metaChange(1, 2)

• connection 1 : execute

  SELECT * FROM information_schema.parameters where SPECIFIC_NAME='metaChange';

  => return the p1 and p2 parameters as expected

• connection 2 : change procedure:

  create or replace procedure metaChange(p1 int)

  BEGIN

  select p1 as 'p1';

  END

  procedure has now only one parameter

• connection 2 : execute
  

  SELECT * FROM information_schema.parameters where SPECIFIC_NAME='metaChange';

  => return the p1 parameters as expected

• connection 1 : execute
  

  SELECT * FROM information_schema.parameters where SPECIFIC_NAME='metaChange';

  => still return the p1 and p2 parameters