Prevent SQLite from assuming that if ((? IS NOT NULL) IS NOT NULL) is true, ? may not be NULL. Fix for [d51a8696].

FossilOrigin-Name: 7833feecfe745e237f239ee4c38a9e4bf7ad66a32919150208da87c00a826473

manifest

@@ -1,5 +1,5 @@
-C Fix\sa\sproblem\sin\sthe\sfts3\sintegrity-check\sroutine\scausing\sit\sto\sreport\sas\scorrupt\stables\sthat\scontain\svalues\swith\sembedded\s0x00\sbytes.
+C Prevent\sSQLite\sfrom\sassuming\sthat\sif\s((?\sIS\sNOT\sNULL)\sIS\sNOT\sNULL)\sis\strue,\s?\smay\snot\sbe\sNULL.\sFix\sfor\s[d51a8696].
-D 2019-10-10T16:41:44.388
+D 2019-10-10T17:09:44.963
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -477,7 +477,7 @@ F src/date.c e1d8ac7102f3f283e63e13867acb0efa33861cf34f0faf4cdbaf9fa7a1eb7041
 F src/dbpage.c 135eb3b5e74f9ef74bde5cec2571192c90c86984fa534c88bf4a055076fa19b7
 F src/dbstat.c c12833de69cb655751487d2c5a59607e36be1c58ba1f4bd536609909ad47b319
 F src/delete.c d08c9e01a2664afd12edcfa3a9c6578517e8ff8735f35509582693adbe0edeaf
-F src/expr.c bf8f259596d5d326fd0e64c001670794e473a115b4855d02112e93de171f68a1
+F src/expr.c 88de5e67b378731da9a45c592122c754693c2a095db61dcd1a0cc64bb72b6145
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 6271fda51794b569d736eba4097d28f13080cd0c9eb66d5fcecb4b77336fae50
 F src/func.c ed33e38cd642058182a31a3f518f2e34f4bbe53aa483335705c153c4d3e50b12
@@ -1081,7 +1081,7 @@ F test/ioerr4.test f130fe9e71008577b342b8874d52984bd04ede2c
 F test/ioerr5.test 2edfa4fb0f896f733071303b42224df8bedd9da4
 F test/ioerr6.test a395a6ab144b26a9e3e21059a1ab6a7149cca65b
 F test/istrue.test 75327829744e65cc8700e69340b8e6c192e10e39dfae7ccb0e970d3c4f49090a
-F test/join.test 7610c1818f8921618279ab633fc03c93d54f6c8fb9e9e7e96b252319ece346d4
+F test/join.test b515753842b739f8310e718ff5a1581d0f80fd7c731c7e642c5af4310d8db94d
 F test/join2.test 10f7047e723ebd68b2f47189be8eed20451a6f665d8bf46f1774c640d1062417
 F test/join3.test 6f0c774ff1ba0489e6c88a3e77b9d3528fb4fda0
 F test/join4.test 1a352e4e267114444c29266ce79e941af5885916
@@ -1846,7 +1846,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ccba7202b69d239724c3b589439c9c3b0e1bba237accfeb11c39d492522b8719
+P 629e20c9880acc2cb9e2fa6da39a15a90483e9a8f433df29d285c23bdfb03b0b
-R 3b21f3f96c636a23fe2aaa621a05215e
+R c986e09ece8f3de56032bcbf04625250
 U dan
-Z 47c295f4dc64bba24bcf234a09efc732
+Z 0b8951352c5f65b37b4ebe46a258877d

manifest.uuid

@@ -1 +1 @@
-629e20c9880acc2cb9e2fa6da39a15a90483e9a8f433df29d285c23bdfb03b0b
+7833feecfe745e237f239ee4c38a9e4bf7ad66a32919150208da87c00a826473

src/expr.c

@@ -5168,10 +5168,11 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
       return WRC_Prune;
 
     case TK_AND:
-      if( sqlite3ExprImpliesNonNullRow(pExpr->pLeft, pWalker->u.iCur)
+      assert( pWalker->eCode==0 );
-       && sqlite3ExprImpliesNonNullRow(pExpr->pRight, pWalker->u.iCur)
+      sqlite3WalkExpr(pWalker, pExpr->pLeft);
-      ){
+      if( pWalker->eCode ){
-        pWalker->eCode = 1;
+        pWalker->eCode = 0;
+        sqlite3WalkExpr(pWalker, pExpr->pRight);
       }
       return WRC_Prune;
 
@@ -5230,15 +5231,8 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
 int sqlite3ExprImpliesNonNullRow(Expr *p, int iTab){
   Walker w;
   p = sqlite3ExprSkipCollateAndLikely(p);
-  while( p ){
+  if( p && p->op==TK_NOTNULL ){
-    if( p->op==TK_NOTNULL ){
     p = p->pLeft;
-    }else if( p->op==TK_AND ){
-      if( sqlite3ExprImpliesNonNullRow(p->pLeft, iTab) ) return 1;
-      p = p->pRight;
-    }else{
-      break;
-    }
   }
   w.xExprCallback = impliesNotNullRow;
   w.xSelectCallback = 0;

test/join.test

@@ -905,5 +905,35 @@ do_execsql_test join-18.4 {
   SELECT NOT(v0.a IS FALSE) FROM v0
 } {1}
 
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test join-19.0 {
+  CREATE TABLE t1(a);
+  CREATE TABLE t2(b);
+  INSERT INTO t1(a) VALUES(0);
+  CREATE VIEW v0(c) AS SELECT t2.b FROM t1 LEFT JOIN t2;
+}
+
+do_execsql_test join-19.1 {
+  SELECT * FROM v0 WHERE v0.c NOTNULL NOTNULL; 
+} {{}}
+
+do_execsql_test join-19.2 {
+  SELECT * FROM t1 LEFT JOIN t2
+} {0 {}}
+
+do_execsql_test join-19.3 {
+  SELECT * FROM t1 LEFT JOIN t2 WHERE (b IS NOT NULL) IS NOT NULL; 
+} {0 {}}
+
+do_execsql_test join-19.4 {
+  SELECT (b IS NOT NULL) IS NOT NULL FROM t1 LEFT JOIN t2
+} {1}
+
+do_execsql_test join-19.5 {
+  SELECT * FROM t1 LEFT JOIN t2 WHERE 
+    (b IS NOT NULL AND b IS NOT NULL) IS NOT NULL; 
+} {0 {}}
+
 finish_test