var_type:
          non_numeric_vartype | numeric_vartype

non_numeric_vartype:
          {CHAR | VARCHAR | WCHAR | WVARCHAR} [(length_num)]
     |    {BINARY | VARBINARY} (length_num)
     |    DATE | TIME | TIMESTAMP
     |    UUID
     |    ROWID

numeric_vartype:
          REAL | FLOAT | DOUBLE
     |    BOOLEAN | TINYINT | SMALLINT | INTEGER | BIGINT
     |    DECIMAL [(precision_num [, scale_num)]