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Improved comments. Slightly tighter implementation, but no big changes.

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FossilOrigin-Name: a1b3f28569f2a8d82b2931527fdfe191b421f3e1ea18ee30e04211e1ad645993
This commit is contained in:
drh
2018-01-12 23:18:38 +00:00
parent ce2fbd1b02
commit 41fb367a2c
6 changed files with 34 additions and 21 deletions
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14
src/vdbe.c
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@@ -2792,12 +2792,17 @@ case OP_MakeRecord: {
pRec = pLast;
do{
assert( memIsValid(pRec) );
pRec->uTemp = serial_type = sqlite3VdbeSerialType(pRec, file_format, &len);
serial_type = sqlite3VdbeSerialType(pRec, file_format, &len);
if( pRec->flags & MEM_Zero ){
if( serial_type==0 ){
assert( pOp->p5==2 || CORRUPT_DB );
/* serial_type 10 used internally only */
pRec->uTemp = 10;
/* 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 );
serial_type = 10;
}else if( nData ){
if( sqlite3VdbeMemExpandBlob(pRec) ) goto no_mem;
}else{
@@ -2809,6 +2814,7 @@ case OP_MakeRecord: {
testcase( serial_type==127 );
testcase( serial_type==128 );
nHdr += serial_type<=127 ? 1 : sqlite3VarintLen(serial_type);
pRec->uTemp = serial_type;
if( pRec==pData0 ) break;
pRec--;
}while(1);