• Sergey Glukhov's avatar
    Bug#39955 SELECT on INFORMATION_SCHEMA.GLOBAL_VARIABLES takes too long · 07e993ac
    Sergey Glukhov authored
    VARIABLE_VALUE field is decreased to 1024 symbols.
    (affected I_S tables: GLOBAL_VARIABLES, SESSION_VARIABLES,
     GLOBAL_STATUS, SESSION_STATUS).
    The only variable which can be longer than 1024 is
    init_connect. The variable will be truncated with warning.
    Additional fix:
    Added where condition filter which speed up queries which
    have where condition with expressions which use VARIABLE_NAME
    field.
    
    
    mysql-test/r/information_schema.result:
      test result
    mysql-test/r/show_check.result:
      result fix
    mysql-test/suite/funcs_1/r/is_columns_is.result:
      result fix
    mysql-test/t/information_schema.test:
      test case
    sql/sql_show.cc:
      VARIABLE_VALUE field is decreased to 1024 symbols.
      (affected I_S tables: GLOBAL_VARIABLES, SESSION_VARIABLES,
       GLOBAL_STATUS, SESSION_STATUS).
      The only variable which can be longer than 1024 is
      init_connect. The variable will be truncated with warning.
      Additional fix:
      Added where condition filter which speed up queries which
      have where condition with expressions which use VARIABLE_NAME
      field.
    07e993ac
sql_show.cc 236 KB