For sqldiff, sqlite_schema comparisons must use compound (synthesized) PK.

FossilOrigin-Name: 5bdd8466129b8e477c8349847f19f2a5adea3f650cca6dbafa3b835e5a538d09

manifest

@@ -1,5 +1,5 @@
-C New\stest\scases\sadded\sto\sfuzzdata8.db.\s\sNo\scode\schanges.
-D 2021-09-07T19:23:32.687
+C For\ssqldiff,\ssqlite_schema\scomparisons\smust\suse\scompound\s(synthesized)\sPK.
+D 2021-09-07T20:58:49.103
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -1887,7 +1887,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 7ce07da76b5e745783e703a834417d725b7d45fd
 F tool/split-sqlite3c.tcl 3efcd4240b738f6bb2b5af0aea7e1e0ef9bc1c61654f645076cec883030b710c
-F tool/sqldiff.c 76381d75e306e3d8cb8bd16dee9e5f752861442898166899749a645db9463e63
+F tool/sqldiff.c 9c639de9fa541a947ea9776435c84adf00f43945e262556e15219ef09f0d912c
 F tool/sqlite3_analyzer.c.in 7eeaae8b0d7577662acaabbb11107af0659d1b41bc1dfdd4d91422de27127968
 F tool/sqltclsh.c.in 1bcc2e9da58fadf17b0bf6a50e68c1159e602ce057210b655d50bad5aaaef898
 F tool/sqltclsh.tcl 862f4cf1418df5e1315b5db3b5ebe88969e2a784525af5fbf9596592f14ed848
@@ -1922,7 +1922,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 7ff92da9f183bc24a0d93996df771df7a712df1122ad897cb9143cde7d57ef7d
-R 13319b6ed34117906bc5e784808c9a4f
-U drh
-Z 6d5eaeab927eb4f20a0418089bf7ab3c
+P 51e5aadafe1a4ba6a0be7fc1732d1ec940cbc5e23723b76267c2abf887d713ac
+R 17b6b23653b2d1c22cf2c809d09a9c4a
+U larrybr
+Z 07a4f44349ac85e50a32dd7e3855976b

manifest.uuid

@@ -1 +1 @@
-51e5aadafe1a4ba6a0be7fc1732d1ec940cbc5e23723b76267c2abf887d713ac
+5bdd8466129b8e477c8349847f19f2a5adea3f650cca6dbafa3b835e5a538d09

tool/sqldiff.c

@@ -200,7 +200,7 @@ static void namelistFree(char **az){
 ** Primary key columns are listed first, followed by data columns.
 ** The number of columns in the primary key is returned in *pnPkey.
 **
-** Normally, the "primary key" in the previous sentence is the true
+** Normally [a], the "primary key" in the previous sentence is the true
 ** primary key - the rowid or INTEGER PRIMARY KEY for ordinary tables
 ** or the declared PRIMARY KEY for WITHOUT ROWID tables.  However, if
 ** the g.bSchemaPK flag is set, then the schema-defined PRIMARY KEY is
@@ -210,8 +210,9 @@ static void namelistFree(char **az){
 ** If the primary key for a table is the rowid but rowid is inaccessible,
 ** then this routine returns a NULL pointer.
 **
-** [a. If the named table is sqlite_schema, omits the "rootpage" column.]
-
+** [a. If the lone, named table is "sqlite_schema", "rootpage" column is
+**  omitted and the "type" and "name" columns are made to be the PK.]
+**
 ** Examples:
 **    CREATE TABLE t1(a INT UNIQUE, b INTEGER, c TEXT, PRIMARY KEY(c));
 **    *pnPKey = 1;
@@ -302,18 +303,32 @@ static char **columnNames(
     if( nPK==0 ) nPK = 1;
     truePk = 1;
   }
+  if( g.bSchemaCompare ){
+    assert( sqlite3_stricmp(zTab,"sqlite_schema")==0
+            || sqlite3_stricmp(zTab,"sqlite_master")==0 );
+    /* For sqlite_schema, will use type and name as the PK. */
+    nPK = 2;
+    truePk = 0;
+  }
   *pnPKey = nPK;
   naz = nPK;
   az = sqlite3_malloc( sizeof(char*)*(nPK+1) );
   if( az==0 ) runtimeError("out of memory");
   memset(az, 0, sizeof(char*)*(nPK+1));
+  if( g.bSchemaCompare ){
+    az[0] = sqlite3_mprintf("%s", "type");
+    az[1] = sqlite3_mprintf("%s", "name");
+  }
   while( SQLITE_ROW==sqlite3_step(pStmt) ){
     char * sid = safeId((char*)sqlite3_column_text(pStmt,1));
     int iPKey;
     if( truePk && (iPKey = sqlite3_column_int(pStmt,5))>0 ){
       az[iPKey-1] = sid;
     }else{
-      if( !g.bSchemaCompare || strcmp(sid,"rootpage")!=0 ){
+      if( !g.bSchemaCompare
+          || !(strcmp(sid,"rootpage")==0
+               ||strcmp(sid,"name")==0
+               ||strcmp(sid,"type")==0)){
         az = sqlite3_realloc(az, sizeof(char*)*(naz+2) );
         if( az==0 ) runtimeError("out of memory");
         az[naz++] = sid;
@@ -335,17 +350,13 @@ static char **columnNames(
   ** avoids extraneous diffs against the schemas due to rowid variance. */
   if( az[0]==0 ){
     const char *azRowid[] = { "rowid", "_rowid_", "oid" };
-    if( g.bSchemaCompare ){
-      az[0] = sqlite3_mprintf("%s", "name");
-    }else {
-      for(i=0; i<sizeof(azRowid)/sizeof(azRowid[0]); i++){
-        for(j=1; j<naz; j++){
-          if( sqlite3_stricmp(az[j], azRowid[i])==0 ) break;
-        }
-        if( j>=naz ){
-          az[0] = sqlite3_mprintf("%s", azRowid[i]);
-          break;
-        }
+    for(i=0; i<sizeof(azRowid)/sizeof(azRowid[0]); i++){
+      for(j=1; j<naz; j++){
+        if( sqlite3_stricmp(az[j], azRowid[i])==0 ) break;
+      }
+      if( j>=naz ){
+        az[0] = sqlite3_mprintf("%s", azRowid[i]);
+        break;
       }
     }
     if( az[0]==0 ){
@@ -1979,8 +1990,8 @@ int main(int argc, char **argv){
         if( i==argc-1 ) cmdlineError("missing argument to %s", argv[i]);
         zTab = argv[++i];
         g.bSchemaCompare =
-          sqlite3_stricmp(zTab, "sqlite_schema")
-          || sqlite3_stricmp(zTab, "sqlite_master");
+          sqlite3_stricmp(zTab, "sqlite_schema")==0
+          || sqlite3_stricmp(zTab, "sqlite_master")==0;
       }else
       if( strcmp(z,"transaction")==0 ){
         useTransaction = 1;