From 4387006c18f99a63fffbed12ce30a0a099999c18 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Thu, 31 Jul 2014 15:44:44 +0000
Subject: [PATCH] Deactivate the DISTINCT in a SELECT on the right-hand side of
 an IN operator, since it should not make any difference in the output but
 dues consume extra memory and CPU time.

FossilOrigin-Name: f4cb53651b1e352fae7378878b830a902bcd9248
---
 manifest      | 14 +++++++-------
 manifest.uuid |  2 +-
 src/expr.c    | 11 +++++++----
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/manifest b/manifest
index c1369a4aa5..240778ae2c 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Re-integrate\sthe\srecent\schanges\sfrom\sthe\s'winMutex'\sbranch\sback\sinto\sthe\sWin32\smutex\ssubsystem.
-D 2014-07-30T23:11:16.516
+C Deactivate\sthe\sDISTINCT\sin\sa\sSELECT\son\sthe\sright-hand\sside\sof\san\sIN\soperator,\nsince\sit\sshould\snot\smake\sany\sdifference\sin\sthe\soutput\sbut\sdues\sconsume\sextra\nmemory\sand\sCPU\stime.
+D 2014-07-31T15:44:44.199
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5eb79e334a5de69c87740edd56af6527dd219308
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -176,7 +176,7 @@ F src/complete.c dc1d136c0feee03c2f7550bafc0d29075e36deac
 F src/ctime.c 0231df905e2c4abba4483ee18ffc05adc321df2a
 F src/date.c 593c744b2623971e45affd0bde347631bdfa4625
 F src/delete.c bcf8f72126cea80fc3d5bc5494cf19b3f8935aaf
-F src/expr.c b989d07fc7c8780fff77365a4fc59881223e340c
+F src/expr.c 77ca517a25a589f8088df88ace671e1c1d7dd3de
 F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
 F src/fkey.c a549cff9fe8b736cdae21650ea0af6de29b77619
 F src/func.c 3bc223ea36cd29a91c481485343d0ee4257ab8dc
@@ -1185,7 +1185,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 3aad01960f92c5e77dba64ac1a6c6b063378fb97
-R 30d9c6511ca3c35312cef2a09e79ecbc
-U mistachkin
-Z c0143953af6d35d374b1fbf6a22594a7
+P 5360ecb0b8891d0c27f3f02d81b6c7b548361a10
+R fa406e6fe8ac4b7f1ba9a949d0399141
+U drh
+Z ae156d6c18fec68cfd3675b456914b76
diff --git a/manifest.uuid b/manifest.uuid
index ab5604951f..1f35b44ebe 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-5360ecb0b8891d0c27f3f02d81b6c7b548361a10
\ No newline at end of file
+f4cb53651b1e352fae7378878b830a902bcd9248
\ No newline at end of file
diff --git a/src/expr.c b/src/expr.c
index 72286dfdf9..94647e5148 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1624,7 +1624,7 @@ int sqlite3FindInIndex(Parse *pParse, Expr *pX, int *prNotFound){
   }
 
   if( eType==0 ){
-    /* Could not found an existing table or index to use as the RHS b-tree.
+    /* Could not find an existing table or index to use as the RHS b-tree.
     ** We will have to generate an ephemeral table to do the job.
     */
     u32 savedNQueryLoop = pParse->nQueryLoop;
@@ -1754,6 +1754,7 @@ int sqlite3CodeSubselect(
         ** Generate code to write the results of the select into the temporary
         ** table allocated and opened above.
         */
+        Select *pSelect = pExpr->x.pSelect;
         SelectDest dest;
         ExprList *pEList;
 
@@ -1761,13 +1762,15 @@ int sqlite3CodeSubselect(
         sqlite3SelectDestInit(&dest, SRT_Set, pExpr->iTable);
         dest.affSdst = (u8)affinity;
         assert( (pExpr->iTable&0x0000FFFF)==pExpr->iTable );
-        pExpr->x.pSelect->iLimit = 0;
+        pSelect->iLimit = 0;
+        testcase( pSelect->selFlags & SF_Distinct );
+        pSelect->selFlags &= ~SF_Distinct;
         testcase( pKeyInfo==0 ); /* Caused by OOM in sqlite3KeyInfoAlloc() */
-        if( sqlite3Select(pParse, pExpr->x.pSelect, &dest) ){
+        if( sqlite3Select(pParse, pSelect, &dest) ){
           sqlite3KeyInfoUnref(pKeyInfo);
           return 0;
         }
-        pEList = pExpr->x.pSelect->pEList;
+        pEList = pSelect->pEList;
         assert( pKeyInfo!=0 ); /* OOM will cause exit after sqlite3Select() */
         assert( pEList!=0 );
         assert( pEList->nExpr>0 );