Sometimes a TK_COLUMN Expr node can have Expr.pTab==0 if it is a reference

to an expression column in an index on and expression.  Fix for ticket
[aa98619ad08ddcab].

FossilOrigin-Name: d0da791ba0edfb65186459345e43500d8364a086a5a1651d828fecc1a1dd1edb

manifest

@@ -1,5 +1,5 @@
-C Properly\sdequote\scolumn\snames\sin\stables\sconstructed\sby\san\saggregate\sSELECT.
-D 2017-08-14T01:33:07.818
+C Sometimes\sa\sTK_COLUMN\sExpr\snode\scan\shave\sExpr.pTab==0\sif\sit\sis\sa\sreference\nto\san\sexpression\scolumn\sin\san\sindex\son\sand\sexpression.\s\sFix\sfor\sticket\n[aa98619ad08ddcab].
+D 2017-08-14T14:53:24.546
 F Makefile.in d9873c9925917cca9990ee24be17eb9613a668012c85a343aef7e5536ae266e8
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 02b469e9dcd5b7ee63fc1fb05babc174260ee4cfa4e0ef2e48c3c6801567a016
@@ -407,7 +407,7 @@ F src/ctime.c ff1be3eed7bdd75aaca61ca8dc848f7c9f850ef2fb9cb56f2734e922a098f9c0
 F src/date.c 48f743d88bbe88f848532d333cca84f26e52a4f217e86f86be7fc1b919c33d74
 F src/dbstat.c 7a4ba8518b6369ef3600c49cf9c918ad979acba610b2aebef1b656d649b96720
 F src/delete.c 21a5f1812fdb599e9f7afb9f650bdabab60a3afd51d7e94e539c982f647b0023
-F src/expr.c fdb2fc465cabbf372fecad1fc2b291758bec74150b4db0fb945332e09df28a0e
+F src/expr.c dc436431dc50a0256b9dcd3daaa06aac0df21834f91068525f2eb3c10b9a7a9a
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 5ff2c895fe087756d8085dc1a9bc229b5670e2a65c3929dd87c71e43649af333
 F src/func.c ed8888ae80b39f5a5d403954e4a05e0a38303523dff8143161439c142d31dec1
@@ -454,13 +454,13 @@ F src/printf.c 439c145d71ff9e0328ec26b7db23a45f995f742d3207dd546e034cdc1667ac9c
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 4324a94573b1e29286f8121e4881db59eaedc014afeb274c8d3e07ed282e0e20
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
-F src/select.c ea8921065512650a9df3f5bf9a9b531c6ef4fb193c0d57e09d7a479ef9b13992
+F src/select.c c9b3d8444bbf6f167d84f41ca6f3672e2521cb163a8c706b19058dc82fffe9b8
 F src/shell.c bd6a37cbe8bf64ef6a6a74fdc50f067d3148149b4ce2b4d03154663e66ded55f
 F src/shell.c.in b5725acacba95ccefa57b6d068f710e29ba8239c3aa704628a1902a1f729c175
 F src/sqlite.h.in 72f1775c7a134f9e358eedafe1ebc703c28b0d705d976464ddbf6a9219448952
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h a1fd3aa82f967da436164e0728a7d6841651fd0c6e27b9044e0eb9f6c8462e47
-F src/sqliteInt.h 5e3c160c1e97568d72a5b2b755cd899d32a96f43a2a58eb18ad83da33b77a0cb
+F src/sqliteInt.h 854a122ff0ebde410a66d4f967e9923de9002f73965c6c9fa0db544bf7e657d1
 F src/sqliteLimit.h 1513bfb7b20378aa0041e7022d04acb73525de35b80b252f1b83fedb4de6a76b
 F src/status.c a9e66593dfb28a9e746cba7153f84d49c1ddc4b1
 F src/table.c b46ad567748f24a326d9de40e5b9659f96ffff34
@@ -940,7 +940,7 @@ F test/index7.test 7feababe16f2091b229c22aff2bcc1d4d6b9d2bb
 F test/index8.test bc2e3db70e8e62459aaa1bd7e4a9b39664f8f9d7
 F test/index9.test 0aa3e509dddf81f93380396e40e9bb386904c1054924ba8fa9bcdfe85a8e7721
 F test/indexedby.test 9c4cd331224e57f79fbf411ae245e6272d415985
-F test/indexexpr1.test f348668daf7f533f1e5578dd4f31e4b9a3875da1ee2a60a8d2d50b938a7699c9
+F test/indexexpr1.test 84100e880154a4b645db9f4fc7642756d9a2b6011b68f73c8efda4d244816de9
 F test/indexexpr2.test 3ddd7f23bc381b9f2b7a15f2d083b1a4078e7733dce8295602ecfa3c74a34cf9
 F test/indexfault.test 31d4ab9a7d2f6e9616933eb079722362a883eb1d
 F test/init.test 15c823093fdabbf7b531fe22cf037134d09587a7
@@ -1647,7 +1647,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 02174842c353bfaa747019cb3dcdee5bca6551d0a06d83fc1ac6d4569e16bc34
-R 81f3b44c4693553d4feb0c8d49d70bc5
+P 7e0d3e9cb071873564b7916c022aba5cd9f3b8ebab9dba787ecd7113c5b7816a
+R fd85cb2e90a98ca349ba60eafe5856e3
 U drh
-Z d0554a39e56793c8309c789eafde6181
+Z 01f8f49b6a69b50c9cc82fb68a921316

manifest.uuid

@@ -1 +1 @@
-7e0d3e9cb071873564b7916c022aba5cd9f3b8ebab9dba787ecd7113c5b7816a
+d0da791ba0edfb65186459345e43500d8364a086a5a1651d828fecc1a1dd1edb

src/expr.c

@@ -1973,8 +1973,8 @@ int sqlite3ExprCanBeNull(const Expr *p){
     case TK_BLOB:
       return 0;
     case TK_COLUMN:
-      assert( p->pTab!=0 );
       return ExprHasProperty(p, EP_CanBeNull) ||
+             p->pTab==0 ||  /* Reference to column of index on expression */
              (p->iColumn>=0 && p->pTab->aCol[p->iColumn].notNull==0);
     default:
       return 1;

src/select.c

@@ -1617,6 +1617,8 @@ static void generateColumnNames(
     Expr *p = pEList->a[i].pExpr;
 
     assert( p!=0 );
+    assert( p->op!=TK_AGG_COLUMN );  /* Agg processing has not run yet */
+    assert( p->op!=TK_COLUMN || p->pTab!=0 ); /* Covering indexes not yet coded */
     if( pEList->a[i].zName ){
       /* An AS clause always takes first priority */
       char *zName = pEList->a[i].zName;

src/sqliteInt.h

@@ -2385,7 +2385,8 @@ struct Expr {
                          ** TK_COLUMN: the value of p5 for OP_Column
                          ** TK_AGG_FUNCTION: nesting depth */
   AggInfo *pAggInfo;     /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */
-  Table *pTab;           /* Table for TK_COLUMN expressions. */
+  Table *pTab;           /* Table for TK_COLUMN expressions.  Can be NULL
+                         ** for a column of an index on an expression */
 };
 
 /*

test/indexexpr1.test

@@ -380,4 +380,26 @@ do_execsql_test indexexpr1-1300.1 {
   SELECT a FROM t1300 WHERE substr(b,4)='ess' COLLATE nocase ORDER BY +a;
 } {3 4}
 
+# Ticket https://sqlite.org/src/tktview/aa98619a
+# Assertion fault using an index on a constant
+#
+do_execsql_test indexexpr1-1400 {
+  CREATE TABLE t1400(x TEXT);
+  CREATE INDEX t1400x ON t1400(1);  -- Index on a constant
+  SELECT 1 IN (SELECT 2) FROM t1400;
+} {}
+do_execsql_test indexexpr1-1410 {
+  INSERT INTO t1400 VALUES('a'),('b');
+  SELECT 1 IN (SELECT 2) FROM t1400;
+} {0 0}
+do_execsql_test indexexpr1-1420 {
+  SELECT 1 IN (SELECT 2 UNION ALL SELECT 1) FROM t1400;
+} {1 1}
+do_execsql_test indexexpr1-1430 {
+  DROP INDEX t1400x;
+  CREATE INDEX t1400x ON t1400(abs(15+3));
+  SELECT abs(15+3) IN (SELECT 17 UNION ALL SELECT 18) FROM t1;
+} {1 1}
+
+
 finish_test