question: public static void decodeToString ( byte [ ] from , int location , int precision , int scale , AkibanAppender appender ) { final int intCount = precision - scale ; final int intFull = intCount / DECIMAL_DIGIT_PER ; final int intPartial = intCount % DECIMAL_DIGIT_PER ; final int fracFull = scale / DECIMAL_DIGIT_PER ; final int fracPartial = scale % DECIMAL_DIGIT_PER ; int curOff = location ; final int mask = ( from [ curOff ] & 0x80 ) != 0 ? 0 : - 1 ; from [ curOff ] ^= 0x80 ; if ( mask != 0 ) appender . append ( '-' ) ; boolean hadOutput = false ; if ( intPartial != 0 ) { int count = DECIMAL_BYTE_DIGITS [ intPartial ] ; int x = unpackIntegerByWidth ( count , from , curOff ) ^ mask ; curOff += count ; if ( x != 0 ) { hadOutput = true ; appender . append ( x ) ; } } for ( int i = 0 ; i < intFull ; ++ i ) { int x = unpackIntegerByWidth ( DECIMAL_TYPE_SIZE , from , curOff ) ^ mask ; curOff += DECIMAL_TYPE_SIZE ; if ( hadOutput ) { appender . append ( String . format ( "%09d" , x ) ) ; } else if ( x != 0 ) { hadOutput = true ; appender . append ( x ) ; } } if ( fracFull + fracPartial > 0 ) { if ( hadOutput ) { appender . append ( '.' ) ; } else { appender . append ( "0." ) ; } } else if ( ! hadOutput ) appender . append ( '0' ) ; for ( int i = 0 ; i < fracFull ; ++ i ) { int x = unpackIntegerByWidth ( DECIMAL_TYPE_SIZE , from , curOff ) ^ mask ; curOff += DECIMAL_TYPE_SIZE ; appender . append ( String . format ( "%09d" , x ) ) ; } if ( fracPartial != 0 ) { int count = DECIMAL_BYTE_DIGITS [ fracPartial ] ; int x = unpackIntegerByWidth ( count , from , curOff ) ^ mask ; int width = scale - ( fracFull * DECIMAL_DIGIT_PER ) ; appender . append ( String . format ( "%0" + width + "d" , x ) ) ; } from [ location ] ^= 0x80 ; }
target:  Decodes bytes representing the decimal value into the given AkibanAppender.