From c7a77ae1c61f66a2ec94de49a4a92872faf4f0c9 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Tue, 6 Sep 2016 17:13:40 +0000
Subject: [PATCH] Avoid unnecessary memory allocations for aiMap in
 codeEqualityConstraints.

FossilOrigin-Name: 70319c3d76abd1e403fcf2a62668736b92a5f3d5
---
 manifest        | 12 ++++++------
 manifest.uuid   |  2 +-
 src/wherecode.c |  8 +++-----
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/manifest b/manifest
index 15e35ee022..5f69a2d824 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Avoid\sa\sNULL\spointer\sderef\sin\scodeAllEqualityConstraints()\sfollowing\san\sOOM.
-D 2016-09-06T16:53:53.727
+C Avoid\sunnecessary\smemory\sallocations\sfor\saiMap\sin\scodeEqualityConstraints.
+D 2016-09-06T17:13:40.420
 F Makefile.in cfd8fb987cd7a6af046daa87daa146d5aad0e088
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 5017381e4853b1472e01d5bb926be1268eba429c
@@ -467,7 +467,7 @@ F src/wal.h 6dd221ed384afdc204bc61e25c23ef7fd5a511f2
 F src/walker.c 2d2cc7fb0f320f7f415215d7247f3c584141ac09
 F src/where.c 48d705e5196a0611a7be90698eade455ee238536
 F src/whereInt.h 14dd243e13b81cbb0a66063d38b70f93a7d6e613
-F src/wherecode.c 4bd3e4c3c9f441a9d1fbd8fb13528f9c1c2c8528
+F src/wherecode.c b0d4febdd9de07ad68faadeacb30df9785f9b979
 F src/whereexpr.c c5ec87e234faf62ac2d4e7f7ce18fb1f4bd475ff
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
@@ -1522,7 +1522,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P bd5a342008575bf66f63881a0bebf43741f2a67b
-R fcb091661f586511d74c9857242646c5
+P c6e528c1c0f17c69c7745b018afa36694118258f
+R 71337de042abb55d5e21dbccb2bcc3d7
 U drh
-Z 30f14ba82e1e5f327ee9c3b7b6a25371
+Z ad68562def745ab96bb3491072f1a7f4
diff --git a/manifest.uuid b/manifest.uuid
index b0f1c15887..728933c62b 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-c6e528c1c0f17c69c7745b018afa36694118258f
\ No newline at end of file
+70319c3d76abd1e403fcf2a62668736b92a5f3d5
\ No newline at end of file
diff --git a/src/wherecode.c b/src/wherecode.c
index 0b1165f024..0524ae2771 100644
--- a/src/wherecode.c
+++ b/src/wherecode.c
@@ -442,11 +442,6 @@ static int codeEqualityTerm(
       if( ALWAYS(pLoop->aLTerm[i]) && pLoop->aLTerm[i]->pExpr==pX ) nEq++;
     }
 
-    if( nEq>1 ){
-      aiMap = (int*)sqlite3DbMallocZero(pParse->db, sizeof(int) * nEq);
-      if( !aiMap ) return 0;
-    }
-
     if( (pX->flags & EP_xIsSelect)==0 || pX->x.pSelect->pEList->nExpr==1 ){
       eType = sqlite3FindInIndex(pParse, pX, IN_INDEX_LOOP, 0, 0);
     }else{
@@ -475,9 +470,12 @@ static int codeEqualityTerm(
           pX->pLeft = pLhs->a[0].pExpr;
         }else{
           pLeft->x.pList = pLhs;
+          aiMap = (int*)sqlite3DbMallocZero(pParse->db, sizeof(int) * nEq);
+          testcase( aiMap==0 );
         }
         pX->x.pSelect->pEList = pRhs;
         eType = sqlite3FindInIndex(pParse, pX, IN_INDEX_LOOP, 0, aiMap);
+        testcase( aiMap!=0 && aiMap[0]!=0 );
         pX->x.pSelect->pEList = pOrigRhs;
         pLeft->x.pList = pOrigLhs;
         pX->pLeft = pLeft;