From 93ca3933d17bca3cd5dbad1731d722c6d0108bf0 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Wed, 10 Aug 2016 20:02:21 +0000
Subject: [PATCH] Optimization to sqlite3WhereExprUsage().

FossilOrigin-Name: 95493058fcf40306727a281f21c5a2a0011b7d02
---
 manifest        | 12 ++++++------
 manifest.uuid   |  2 +-
 src/whereexpr.c |  5 +++--
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/manifest b/manifest
index d87a893d49..842f885dfd 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C List\sof\sMATCH\soperator\snames\sin\sisMatchOfColumn()\sshould\sbe\sconstant.
-D 2016-08-10T19:43:29.424
+C Optimization\sto\ssqlite3WhereExprUsage().
+D 2016-08-10T20:02:21.519
 F Makefile.in cfd8fb987cd7a6af046daa87daa146d5aad0e088
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
@@ -467,7 +467,7 @@ F src/walker.c 2d2cc7fb0f320f7f415215d7247f3c584141ac09
 F src/where.c 5c9df42d50888be8274a5a0eb062eb0629869bd3
 F src/whereInt.h e5b939701a7ceffc5a3a8188a37f9746416ebcd0
 F src/wherecode.c 99707d11907c71d289ee9553d2d1a22f1fd8ba41
-F src/whereexpr.c 600e6c619d69f5455dd99c69fec8c42ac44e5c9d
+F src/whereexpr.c 98ce9f3b8d92b6f741b9f3498f9619695739256e
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -1510,7 +1510,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ebccbd96094ac64de39dbd0d220d3a7afd8cd40e
-R fac33bc7c9b64529fad9a6567bc0fbba
+P 7319d676aaf95ba7391379f4cdf193b6aa898893
+R 35b146f4e31088e5d413861ddde93f74
 U drh
-Z d9cf90e53680d487c9bbc0ab8247d4aa
+Z 2c745f38c120984510a4f6c92123cc21
diff --git a/manifest.uuid b/manifest.uuid
index 1286c1b8bf..99c25a4923 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-7319d676aaf95ba7391379f4cdf193b6aa898893
\ No newline at end of file
+95493058fcf40306727a281f21c5a2a0011b7d02
\ No newline at end of file
diff --git a/src/whereexpr.c b/src/whereexpr.c
index 2461d1ddf8..2768428e2d 100644
--- a/src/whereexpr.c
+++ b/src/whereexpr.c
@@ -1275,13 +1275,14 @@ void sqlite3WhereClauseClear(WhereClause *pWC){
 ** tree.
 */
 Bitmask sqlite3WhereExprUsage(WhereMaskSet *pMaskSet, Expr *p){
-  Bitmask mask = 0;
+  Bitmask mask;
   if( p==0 ) return 0;
   if( p->op==TK_COLUMN ){
     mask = sqlite3WhereGetMask(pMaskSet, p->iTable);
     return mask;
   }
-  mask = sqlite3WhereExprUsage(pMaskSet, p->pRight);
+  assert( !ExprHasProperty(p, EP_TokenOnly) );
+  mask = p->pRight ? sqlite3WhereExprUsage(pMaskSet, p->pRight) : 0;
   if( p->pLeft ) mask |= sqlite3WhereExprUsage(pMaskSet, p->pLeft);
   if( ExprHasProperty(p, EP_xIsSelect) ){
     mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
-- 
2.47.2