anchor.diff:  STDDEV_SAMP:                     S T D D E V '_' S A M P;
   STORED_AS_PARQUET:               S T O R E D ' ' A S ' ' P A R Q U E T;
   STRCMP:                          S T R C M P;
  +STR_TO_DATE:                     S T R '_' T O '_' D A T E;
  +SUBDATE:                         S U B D A T E;
   SUBSTRING_INDEX:                 S U B S T R I N G '_' I N D E X;
   SUM:                             S U M;
   SQRT:                            S Q R T;
   STRTOL:                          S T R T O L;
  +SYSDATE:                         S Y S D A T E;
   TAN:                             T A N;
   THROW:                           T H R O W;
   TIES:                            T I E S;
   TIME:                            T I M E;
  +TIMEDIFF:                        T I M E D I F F;
  +TIMESTAMP:                       T I M E S T A M P;
  +TIME_FORMAT:                     T I M E '_' F O R M A T E;
  +TIME_TO_SEC:                     T I M E '_' T O '_' S E C;
   TO_DATE:                         T O '_' D A T E;
  +TO_DAYS:                         T O '_' D A Y S;
   TRIM:                            T R I M;
   TRY:                             T R Y;
   TYPE:                            T Y P E;
  
positive.code: NOCOUNT:                         N O C O U N T;
  NOEXPAND:                        N O E X P A N D;
  NORECOMPUTE:                     N O R E C O M P U T E;
  NTILE:                           N T I L E;
  NUMBER:                          N U M B E R;
  NVL:                             N V L;
  
negative.code:     : function_name=(ROUND | MOD | PMOD | LEFT | RIGHT | STRTOL | POW | POWER | PERCENTILE | SPLIT | INSTR | ENCODE | DECODE | SHIFTLEFT
      | SHIFTRIGHT | SHIFTRIGHTUNSIGNED | NVL | FIND_IN_SET | FORMAT_NUMBER | FORMAT | GET_JSON_OBJECT | IN_FILE
      | LOCATE | REPEAT | AES_ENCRYPT | AES_DECRYPT | POSITION | STRCMP | TRUNCATE | ADDDATE | ADDTIME | DATEDIFF | DATE_ADD
      | DATE_FORMAT | DATE_SUB | MAKEDATE | PERIOD_ADD | PERIOD_DIFF | SUBDATE | TIME_FORMAT | TIMEDIFF | CONVERT | IFNULL | NULLIF)
        '(' expression ',' expression ')'
      ;
  
  