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Refactor the way that DEFAULT expressions are stored on columns, in order

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to save memory in the common case where the column has no DEFAULT clause.

FossilOrigin-Name: 8646547e54211d44c415663c33775c4268550f8332949c4731a4bb6ec9cc663a
This commit is contained in:
drh
2021-07-31 20:30:41 +00:00
parent c2df4d6adb
commit 79cf2b7120
11 changed files with 126 additions and 62 deletions
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9
src/update.c
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@@ -66,7 +66,8 @@ void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
Column *pCol = &pTab->aCol[i];
VdbeComment((v, "%s.%s", pTab->zName, pCol->zName));
assert( i<pTab->nCol );
sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc,
sqlite3ValueFromExpr(sqlite3VdbeDb(v),
sqlite3ColumnExpr(pTab,pCol), enc,
pCol->affinity, &pValue);
if( pValue ){
sqlite3VdbeAppendP4(v, pValue, P4_MEM);
@@ -526,8 +527,10 @@ void sqlite3Update(
for(i=0; i<pTab->nCol; i++){
if( aXRef[i]>=0 ) continue;
if( (pTab->aCol[i].colFlags & COLFLAG_GENERATED)==0 ) continue;
if( sqlite3ExprReferencesUpdatedColumn(pTab->aCol[i].pDflt,
aXRef, chngRowid) ){
if( sqlite3ExprReferencesUpdatedColumn(
sqlite3ColumnExpr(pTab, &pTab->aCol[i]),
aXRef, chngRowid)
){
aXRef[i] = 99999;
bProgress = 1;
}