Syntax for TIMESTAMPADD:

TIMESTAMPADD(interval, integer_expression, datetime_expression)

interval:= FRAC_SECOND | SECOND | MINUTE | HOUR | DAY | WEEK | MONTH | 
QUARTER | YEAR

Supported SQL_TSI_  prefix  (like SQL_TSI_SECOND)

Syntax for TIMESTAMPDIFF:

TIMESTAMPDIFF(interval, datetime_expression1, datetime_expression2)

interval:= FRAC_SECOND | SECOND | MINUTE | HOUR | DAY | WEEK | MONTH | 
QUARTER | YEAR

Supported SQL_TSI_  prefix  (like SQL_TSI_SECOND)


mysql-test/r/func_sapdb.result:
  Additional tests for timediff
mysql-test/r/func_time.result:
  Tests for timestampadd, timestampdiff functions
mysql-test/r/keywords.result:
  Test for new keywords
mysql-test/t/func_sapdb.test:
  Additional tests for timediff
mysql-test/t/func_time.test:
  Tests for timestampadd, timestampdiff functions
mysql-test/t/keywords.test:
  Test for new keywords
sql/item_create.cc:
  WL#530&531: TIMESTAMPADD, TIMESTAMPDIFF functions
sql/item_create.h:
  WL#530&531: TIMESTAMPADD, TIMESTAMPDIFF functions
sql/item_timefunc.cc:
  WL#530&531: TIMESTAMPADD, TIMESTAMPDIFF functions
sql/item_timefunc.h:
  WL#530&531: TIMESTAMPADD, TIMESTAMPDIFF functions
sql/lex.h:
  WL#530&531: TIMESTAMPADD, TIMESTAMPDIFF functions
sql/sql_yacc.yy:
  WL#530&531: TIMESTAMPADD, TIMESTAMPDIFF functions