Fix ALTER TABLE DROP COLUMN so that it generates valid bytecode even when

operating on a corrupt database and using PRAGMA writable_schema=ON.
dbsqlfuzz 5f09e7bcc78b4954d06bf9f2400d7715f48d1fef

FossilOrigin-Name: b65f4f763979ee9e0b943c787609ea22d6f7e01d41dfc1e084ec50a085a3550c

1 files changed, 6 insertions, 0 deletions

diff --git a/src/alter.c b/src/alter.c
index 9c5b46261..c29be3f6e 100644
--- a/src/alter.c
+++ b/src/alter.c
@@ -2174,6 +2174,12 @@ void sqlite3AlterDropColumn(Parse *pParse, SrcList *pSrc, Token *pName){
         nField++;
       }
     }
+    if( nField==0 ){
+      /* dbsqlfuzz 5f09e7bcc78b4954d06bf9f2400d7715f48d1fef */
+      pParse->nMem++;
+      sqlite3VdbeAddOp2(v, OP_Null, 0, reg+1);
+      nField = 1;
+    }
     sqlite3VdbeAddOp3(v, OP_MakeRecord, reg+1, nField, regRec);
     if( pPk ){
       sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iCur, regRec, reg+1, pPk->nKeyCol);