While perusing SQL92 I realized that we are delivering the wrong SQLSTATE

While perusing SQL92 I realized that we are delivering the wrong SQLSTATE
error code for string-too-long errors.  It should be STRING_DATA_RIGHT_TRUNCATION
not STRING_DATA_LENGTH_MISMATCH.  The latter probably should only be
applied to cases where a string must be exactly so many bits --- there are
no cases at all where it applies to character strings, only bit strings.