An sql_data_type_name follows the AS keyword in a 4d_function_call and can have one of the following values:
ALPHA_NUMERIC
VARCHAR
TEXT
TIMESTAMP
INTERVAL
DURATION
BOOLEAN
BIT
BYTE
INT16
SMALLINT
INT32
INT
INT64
NUMERIC
REAL
FLOAT
DOUBLE PRECISION
BLOB
BIT VARYING
CLOB
PICTURE