From c07df4c3b9df4acd8a98f74e592564b8bf6f76af Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Thu, 21 Sep 2017 01:04:30 +0000
Subject: [PATCH] Revert one performance improvement changes from check-in
 [3b3e32d4cd07] as it was causing a reference to an uninitialized value.

FossilOrigin-Name: f8b1c64d3eeb8413ca149f34cc00f9154a5446d06ad33bbffa69118e6110f81d
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/vdbemem.c |  2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/manifest b/manifest
index 46a3a70a98..3992ec18ab 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sthe\srendering\sof\sthe\sP4_INTARRAY\sargument\sto\sthe\sOP_IntegrityCk\sopcode\nin\sthe\soutput\sof\sEXPLAIN.
-D 2017-09-21T00:49:15.047
+C Revert\sone\sperformance\simprovement\schanges\sfrom\scheck-in\s[3b3e32d4cd07]\sas\nit\swas\scausing\sa\sreference\sto\san\suninitialized\svalue.
+D 2017-09-21T01:04:30.271
 F Makefile.in 4bc36d913c2e3e2d326d588d72f618ac9788b2fd4b7efda61102611a6495c3ff
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 6033b51b6aea702ea059f6ab2d47b1d3cef648695f787247dd4fb395fe60673f
@@ -532,7 +532,7 @@ F src/vdbeInt.h 1fe00770144c12c4913128f35262d11527ef3284561baaab59b947a41c08d0d9
 F src/vdbeapi.c 9c670ca0dcc1cd86373aa353b747b26fe531ca5cd4331690c611d1f03842e2a1
 F src/vdbeaux.c 831a77aaa7aa43005f1c9bf3e9eb6506f4865e1cf99943ccdcd3be5d2dd8a3c7
 F src/vdbeblob.c 635a79b60340a6a14a622ea8dcb081f0a66b1ac3836870c587f232eec08c0286
-F src/vdbemem.c 9496f08e196c536397039783cdfda4ad2bc944d84ccad93df03e1ed3635534d6
+F src/vdbemem.c 043f9fdbb19d4857d5ac9c1ff60b972da9397e51c1a3d5ff43e8b6b4ae552aaf
 F src/vdbesort.c 731a09e5cb9e96b70c394c1b7cf3860fbe84acca7682e178615eb941a3a0ef2f
 F src/vdbetrace.c 48e11ebe040c6b41d146abed2602e3d00d621d7ebe4eb29b0a0f1617fd3c2f6c
 F src/vtab.c f1d5c23132fb0247af3e86146404112283ddedb6c518de0d4edc91cfb36970ef
@@ -1655,7 +1655,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 4b3f7eacb862fbb5b75cf50b72fb60dfbd0acb5818e9f83383a6a63c8bbeacdf
-R 6842bc7ed52b90693780a367a8597f47
+P adc12c83dda8ba93ca220bbff649f763058b9440968ae463621f0cb7de8889cf
+R 74e9a42e62567d447ce10652f9c93fed
 U drh
-Z a3512caea006d13b8a10416043a6f9b4
+Z 07fc711a459108ff2c2431795ab36ea3
diff --git a/manifest.uuid b/manifest.uuid
index 43a4f7bc69..4aaeed6a9d 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-adc12c83dda8ba93ca220bbff649f763058b9440968ae463621f0cb7de8889cf
\ No newline at end of file
+f8b1c64d3eeb8413ca149f34cc00f9154a5446d06ad33bbffa69118e6110f81d
\ No newline at end of file
diff --git a/src/vdbemem.c b/src/vdbemem.c
index 403ad889cd..8447ab378d 100644
--- a/src/vdbemem.c
+++ b/src/vdbemem.c
@@ -114,7 +114,7 @@ int sqlite3VdbeChangeEncoding(Mem *pMem, int desiredEnc){
   assert( (pMem->flags&MEM_RowSet)==0 );
   assert( desiredEnc==SQLITE_UTF8 || desiredEnc==SQLITE_UTF16LE
            || desiredEnc==SQLITE_UTF16BE );
-  if( pMem->enc==desiredEnc || !(pMem->flags&MEM_Str) ){
+  if( !(pMem->flags&MEM_Str) || pMem->enc==desiredEnc ){
     return SQLITE_OK;
   }
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-- 
2.47.2