Internally, remove all references to a Window object that belongs to an expression in an ORDER BY clause if that expression is converted to an alias of a result-set expression.

FossilOrigin-Name: a21ffcd8176672e791c11e7d3869878b0655e9f7fb3646378421fb7480d4d8c6

manifest

@@ -1,5 +1,5 @@
-C Fix\sa\stypo\sin\sthe\sdocumentation\sfor\ssqlite3_total_changes().
-D 2019-02-25T14:25:42.778
+C Internally,\sremove\sall\sreferences\sto\sa\sWindow\sobject\sthat\sbelongs\sto\san\sexpression\sin\san\sORDER\sBY\sclause\sif\sthat\sexpression\sis\sconverted\sto\san\salias\sof\sa\sresult-set\sexpression.
+D 2019-02-25T15:55:53.511
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 178d8eb6840771149cee40b322d1b3be30d330198c522c903c1b66fb5a1bfca4
@@ -512,7 +512,7 @@ F src/pragma.h a776bb9c915207e9d1117b5754743ddf1bf6a39cc092a4a44e74e6cb5fab1177
 F src/prepare.c 78027c6231fbb19ca186a5f5f0c0a1375d9c2cec0655273f9bd90d9ff74a34b3
 F src/printf.c cbf27c320091a83279d1738f68a27a9fe01698c607ce80516ab6bdb5a9c36a1a
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
-F src/resolve.c c8f207247472c41ac73d738e1c1a80719ad253d1dbb617ed57740492b2a6c097
+F src/resolve.c dd7550ed05486c49c2b467b46ef37c78cdf6bf9df3b15134816d081691fd42d1
 F src/rowset.c d977b011993aaea002cab3e0bb2ce50cf346000dff94e944d547b989f4b1fe93
 F src/select.c c998f694759e37799929e28df8a2649747f8774d4fc233529ab6bda689388e15
 F src/shell.c.in f2c1adbee3f6f36686b4a38d2168ebfc25298b4ad1e6d95199fc4e95b539251d
@@ -1675,7 +1675,7 @@ F test/win32heap.test 10fd891266bd00af68671e702317726375e5407561d859be1aa04696f2
 F test/win32lock.test fbf107c91d8f5512be5a5b87c4c42ab9fdd54972
 F test/win32longpath.test 169c75a3b2e43481f4a62122510210c67b08f26d
 F test/win32nolock.test ac4f08811a562e45a5755e661f45ca85892bdbbc
-F test/window1.test 2798c8249e0f122c9bacce6aa7324765a5cd9106e49e7aacc81f6033d281577b
+F test/window1.test d141eba02ee4d7441dcb45148d776aded21992e8de6ddbbe2aae8151e5fad45e
 F test/window2.tcl 9bfa842d8a62b0d36dc8c1b5972206393c43847433c6d75940b87fec93ce3143
 F test/window2.test 8e6d2a1b9f54dfebee1cde961c8590cd87b4db45c50f44947a211e1b63c2a05e
 F test/window3.tcl 577a3b1ff913208e5248c04dab9df17fd760ce159a752789e26d0cb4a5f91823
@@ -1804,8 +1804,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 0e64ac122aac469aff4ca7f55a494c8d2d34bbcc1b854f3d579db5926590a660
-Q +8474c1560e0c3a28c6a7ed360202a8e7caae3c8259f60bbfa6d2948ab7876f51
-R d79b1fbae35de34d8696dc327df3acfa
+P 4febdfb37b475361378b07075ed58e7273e3c229bb93e319e4f78c217682d0b8
+Q +579b66eaa0816561c6e47ea116b46f229188f0fc84c1173bfe0d21df2dff9a9a
+R a79d07126ad692dd98c735ebc3ce8975
 U drh
-Z 2ab091dd0605bd13d01a019bd758cd1d
+Z 903d8ee651a8167a7ca2acbad07f1e06

manifest.uuid

@@ -1 +1 @@
-4febdfb37b475361378b07075ed58e7273e3c229bb93e319e4f78c217682d0b8
+a21ffcd8176672e791c11e7d3869878b0655e9f7fb3646378421fb7480d4d8c6

src/resolve.c

@@ -1243,6 +1243,38 @@ int sqlite3ResolveOrderGroupBy(
   return 0;
 }
 
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** Walker callback for resolveRemoveWindows().
+*/
+static int resolveRemoveWindowsCb(Walker *pWalker, Expr *pExpr){
+  if( ExprHasProperty(pExpr, EP_WinFunc) ){
+    Window **pp;
+    for(pp=&pWalker->u.pSelect->pWin; *pp; pp=&(*pp)->pNextWin){
+      if( *pp==pExpr->y.pWin ){
+        *pp = (*pp)->pNextWin;
+        break;
+      }    
+    }
+  }
+  return WRC_Continue;
+}
+
+/*
+** Remove any Window objects owned by the expression pExpr from the
+** Select.pWin list of Select object pSelect.
+*/
+static void resolveRemoveWindows(Select *pSelect, Expr *pExpr){
+  Walker sWalker;
+  memset(&sWalker, 0, sizeof(Walker));
+  sWalker.xExprCallback = resolveRemoveWindowsCb;
+  sWalker.u.pSelect = pSelect;
+  sqlite3WalkExpr(&sWalker, pExpr);
+}
+#else
+# define resolveRemoveWindows(x,y)
+#endif
+
 /*
 ** pOrderBy is an ORDER BY or GROUP BY clause in SELECT statement pSelect.
 ** The Name context of the SELECT statement is pNC.  zType is either
@@ -1309,19 +1341,10 @@ static int resolveOrderGroupBy(
     }
     for(j=0; j<pSelect->pEList->nExpr; j++){
       if( sqlite3ExprCompare(0, pE, pSelect->pEList->a[j].pExpr, -1)==0 ){
-#ifndef SQLITE_OMIT_WINDOWFUNC
-        if( ExprHasProperty(pE, EP_WinFunc) ){
-          /* Since this window function is being changed into a reference
-          ** to the same window function the result set, remove the instance
-          ** of this window function from the Select.pWin list. */
-          Window **pp;
-          for(pp=&pSelect->pWin; *pp; pp=&(*pp)->pNextWin){
-            if( *pp==pE->y.pWin ){
-              *pp = (*pp)->pNextWin;
-            }    
-          }
-        }
-#endif
+        /* Since this expresion is being changed into a reference
+        ** to an identical expression in the result set, remove all Window
+        ** objects belonging to the expression from the Select.pWin list. */
+        resolveRemoveWindows(pSelect, pE);
         pItem->u.x.iOrderByCol = j+1;
       }
     }

test/window1.test

@@ -700,5 +700,25 @@ do_execsql_test 16.2 {
   3 101
 }
 
+#-------------------------------------------------------------------------
+do_execsql_test 17.0 {
+  CREATE TABLE t8(a);
+  INSERT INTO t8 VALUES(1), (2), (3);
+}
+
+do_execsql_test 17.1 {
+  SELECT +sum(0) OVER () ORDER BY +sum(0) OVER ();
+} {0}
+
+do_execsql_test 17.2 {
+  select +sum(a) OVER () FROM t8 ORDER BY +sum(a) OVER () DESC;
+} {6 6 6}
+
+do_execsql_test 17.3 {
+  SELECT 10+sum(a) OVER (ORDER BY a) 
+  FROM t8 
+  ORDER BY 10+sum(a) OVER (ORDER BY a) DESC;
+} {16 13 11}
+
 
 finish_test