The InnoDB internal SQL parser, which is used for updating the InnoDB
data dictionary tables (to be removed in MDEV-11655), persistent
statistics (to be refactored in MDEV-15020) and fulltext indexes,
implements some unused keywords and built-in functions:

OUT BINARY BLOB INTEGER FLOAT SUM DISTINCT READ
COMPACT BLOCK_SIZE
TO_CHAR TO_NUMBER BINARY_TO_NUMBER REPLSTR SYSDATE PRINTF ASSERT
RND RND_STR ROW_PRINTF UNSIGNED

Also, procedures are never declared with parameters. Only one top-level
procedure is declared and invoked at a time, and parameters are being
passed via pars_info_t.