SQLite

      pLast--;
      nField--;
    }
  }
#endif

  /* Loop through the elements that will make up the record to figure
  ** out how much space is required for the new record.
  ** out how much space is required for the new record.  After this loop,
  ** the Mem.uTemp field of each term should hold the serial-type that will
  ** be used for that term in the generated record:
  **
  **   Mem.uTemp value    type
  **   ---------------    ---------------
  **      0               NULL
  **      1               1-byte signed integer
  **      2               2-byte signed integer
  **      3               3-byte signed integer
  **      4               4-byte signed integer
  **      5               6-byte signed integer
  **      6               8-byte signed integer
  **      7               IEEE float
  **      8               Integer constant 0
  **      9               Integer constant 1
  **     10,11            reserved for expansion
  **    N>=12 and even    BLOB
  **    N>=13 and odd     text
  **
  ** The following additional values are computed:
  **     nHdr        Number of bytes needed for the record header
  **     nData       Number of bytes of data space needed for the record
  **     nZero       Zero bytes at the end of the record
  */
  pRec = pLast;
  do{
    assert( memIsValid(pRec) );
    if( pRec->flags & MEM_Null ){
      if( pRec->flags & MEM_Zero ){
        /* Values with MEM_Null and MEM_Zero are created by xColumn virtual
        ** table methods that never invoke sqlite3_result_xxxxx() while
        ** computing an unchanging column value in an UPDATE statement.
        ** Give such values a special internal-use-only serial-type of 10
        ** so that they can be passed through to xUpdate and have
        ** a true sqlite3_value_nochange(). */
        assert( pOp->p5==OPFLAG_NOCHNG_MAGIC || CORRUPT_DB );
        pRec->uTemp = 10;
      }else{
        pRec->uTemp = 0;  /* Serial-type 0 means NULL */
        pRec->uTemp = 0;
      }
      nHdr++;
    }else if( pRec->flags & (MEM_Int|MEM_IntReal) ){
      /* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */
      i64 i = pRec->u.i;
      u64 u;
      testcase( pRec->flags & MEM_Int );
      testcase( pRec->flags & MEM_IntReal );
      if( i<0 ){
        u = ~i;
      }else{
        u = i;
      }
      nHdr++;
      testcase( u==127 );               testcase( u==128 );
      testcase( u==32767 );             testcase( u==32768 );
      testcase( u==8388607 );           testcase( u==8388608 );
      testcase( u==2147483647 );        testcase( u==2147483648 );
      testcase( u==140737488355327LL ); testcase( u==140737488355328LL );
      if( u<=127 ){
        if( (i&1)==i && file_format>=4 ){
          pRec->uTemp = 8+(u32)u;
        }else{
          nData++;
          pRec->uTemp = 1;
        }