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Overview
| Comment: | Improved comments and extra testcase() macros on the serial-type computation logic in the OP_MakeRecord opcode. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
18bfb2179ce2c60cec8f5859a84b7377 |
| User & Date: | drh 2019-07-11 19:50:18 |
Context
|
2019-07-13
| ||
| 16:15 | Remove unreachable "break" statements to silence harmless compiler warnings from ICC. check-in: 0d7287e1 user: drh tags: trunk | |
| 09:56 | Merge latest trunk changes into this branch. check-in: 86ab963c user: dan tags: filter-clause | |
|
2019-07-11
| ||
| 19:50 | Improved comments and extra testcase() macros on the serial-type computation logic in the OP_MakeRecord opcode. check-in: 18bfb217 user: drh tags: trunk | |
| 19:27 | Increase the version number to 3.30.0 for the next release cycle. check-in: 2578e3c6 user: drh tags: trunk | |
Changes
Changes to src/vdbe.c.
2923 2923 pLast--; 2924 2924 nField--; 2925 2925 } 2926 2926 } 2927 2927 #endif 2928 2928 2929 2929 /* Loop through the elements that will make up the record to figure 2930 - ** out how much space is required for the new record. 2930 + ** out how much space is required for the new record. After this loop, 2931 + ** the Mem.uTemp field of each term should hold the serial-type that will 2932 + ** be used for that term in the generated record: 2933 + ** 2934 + ** Mem.uTemp value type 2935 + ** --------------- --------------- 2936 + ** 0 NULL 2937 + ** 1 1-byte signed integer 2938 + ** 2 2-byte signed integer 2939 + ** 3 3-byte signed integer 2940 + ** 4 4-byte signed integer 2941 + ** 5 6-byte signed integer 2942 + ** 6 8-byte signed integer 2943 + ** 7 IEEE float 2944 + ** 8 Integer constant 0 2945 + ** 9 Integer constant 1 2946 + ** 10,11 reserved for expansion 2947 + ** N>=12 and even BLOB 2948 + ** N>=13 and odd text 2949 + ** 2950 + ** The following additional values are computed: 2951 + ** nHdr Number of bytes needed for the record header 2952 + ** nData Number of bytes of data space needed for the record 2953 + ** nZero Zero bytes at the end of the record 2931 2954 */ 2932 2955 pRec = pLast; 2933 2956 do{ 2934 2957 assert( memIsValid(pRec) ); 2935 2958 if( pRec->flags & MEM_Null ){ 2936 2959 if( pRec->flags & MEM_Zero ){ 2937 2960 /* Values with MEM_Null and MEM_Zero are created by xColumn virtual ................................................................................ 2939 2962 ** computing an unchanging column value in an UPDATE statement. 2940 2963 ** Give such values a special internal-use-only serial-type of 10 2941 2964 ** so that they can be passed through to xUpdate and have 2942 2965 ** a true sqlite3_value_nochange(). */ 2943 2966 assert( pOp->p5==OPFLAG_NOCHNG_MAGIC || CORRUPT_DB ); 2944 2967 pRec->uTemp = 10; 2945 2968 }else{ 2946 - pRec->uTemp = 0; /* Serial-type 0 means NULL */ 2969 + pRec->uTemp = 0; 2947 2970 } 2948 2971 nHdr++; 2949 2972 }else if( pRec->flags & (MEM_Int|MEM_IntReal) ){ 2950 2973 /* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */ 2951 2974 i64 i = pRec->u.i; 2952 2975 u64 u; 2953 2976 testcase( pRec->flags & MEM_Int ); ................................................................................ 2954 2977 testcase( pRec->flags & MEM_IntReal ); 2955 2978 if( i<0 ){ 2956 2979 u = ~i; 2957 2980 }else{ 2958 2981 u = i; 2959 2982 } 2960 2983 nHdr++; 2984 + testcase( u==127 ); testcase( u==128 ); 2985 + testcase( u==32767 ); testcase( u==32768 ); 2986 + testcase( u==8388607 ); testcase( u==8388608 ); 2987 + testcase( u==2147483647 ); testcase( u==2147483648 ); 2988 + testcase( u==140737488355327LL ); testcase( u==140737488355328LL ); 2961 2989 if( u<=127 ){ 2962 2990 if( (i&1)==i && file_format>=4 ){ 2963 2991 pRec->uTemp = 8+(u32)u; 2964 2992 }else{ 2965 2993 nData++; 2966 2994 pRec->uTemp = 1; 2967 2995 }