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Add the experimental sqlite3_value_nochange() interface usable by xUpdate

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methods of virtual tables to see if a column has actually changed values.

FossilOrigin-Name: 8b7be15ece9e2e83959bb0e21e240106fe1077431242c3cc6b81f1baa2382f40
This commit is contained in:
drh
2018-01-12 21:00:14 +00:00
parent 4ec6f3a075
commit ce2fbd1b02
9 changed files with 56 additions and 24 deletions
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6
src/vdbeaux.c
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@@ -3454,7 +3454,11 @@ u32 sqlite3VdbeSerialGet(
Mem *pMem /* Memory cell to write value into */
){
switch( serial_type ){
case 10: /* Reserved for future use */
case 10: { /* Internal use only: NULL with virtual table
** UPDATE no-change flag set */
pMem->flags = MEM_Null|MEM_Zero;
break;
}
case 11: /* Reserved for future use */
case 0: { /* Null */
/* EVIDENCE-OF: R-24078-09375 Value is a NULL. */