From bab39e1358f62bb566726a8e9beff9ff47caedd4 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Mon, 19 Jul 2004 23:38:11 +0000
Subject: [PATCH] Refinements to the LIMIT patch (1823) for ticket #749. (CVS
 1825)

FossilOrigin-Name: 9d4f43f030438b3e7358032de2e04132b80e04a8
---
 manifest        | 14 +++++++-------
 manifest.uuid   |  2 +-
 src/select.c    | 11 +++++------
 test/limit.test | 15 ++++++++++-----
 4 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/manifest b/manifest
index 7d01ae3a80..d3e9ca57f8 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C LIMIT\soccurs\safter\sDISTINCT.\s\sTicket\s#749.\s(CVS\s1823)
-D 2004-07-19T23:16:39
+C Refinements\sto\sthe\sLIMIT\spatch\s(1823)\sfor\sticket\s#749.\s(CVS\s1825)
+D 2004-07-19T23:38:11
 F Makefile.in 4a5e570a9e2d35b09c31b3cf01b78cea764ade4b
 F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
 F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
@@ -57,7 +57,7 @@ F src/parse.y 51c8e696276c409618e66a4ccf316fcff245506e
 F src/pragma.c 8326df8c400f573eb43004dfb8e53e5102acb3e4
 F src/printf.c 36090f6d7b4946539de97c1850675ce55ef66c16
 F src/random.c eff68e3f257e05e81eae6c4d50a51eb88beb4ff3
-F src/select.c d4585c55c460dad2019964e5d0ae18f9b91cd142
+F src/select.c b8d0a8325552e46bf295ccfdad54668404fad88b
 F src/shell.c ebec5da57ea401f4886eefc790917b939d94d595
 F src/sqlite.h.in aaf46c8d458efd8aca694ec4f18c6ecf616ee55e
 F src/sqliteInt.h aeae6793d1db335ec1179ad9f26b0affc0ec658a
@@ -129,7 +129,7 @@ F test/join3.test 8d989e52413199065bd630b3d0a6b2329d173099
 F test/join4.test 8dec387d06b3a4685e1104048065cf5236b99b93
 F test/lastinsert.test 31382f88b9b0270333ac9e4a17f2c2f4732da718
 F test/laststmtchanges.test 417aa27eb2b5cdfafb46e390e2c9ddd0a20eba43
-F test/limit.test 404a540e3fede22cab5667e12d7e3788617b07dc
+F test/limit.test e4ee72ab4869992950f8cfce256e04a0a2a98b23
 F test/lock.test 1dbf1d06b0a7eb36237b4f107cfb3da9726b449e
 F test/lock2.test 4108cabaa108a142e5eed83de3b13b6e579c12cf
 F test/main.test e8c4d9ca6d1e5f5e55e6550d31aec488883b2ed9
@@ -237,7 +237,7 @@ F www/tclsqlite.tcl 19191cf2a1010eaeff74c51d83fd5f5a4d899075
 F www/vdbe.tcl 59288db1ac5c0616296b26dce071c36cb611dfe9
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl a8335bce47cc2fddb07f19052cb0cb4d9129a8e4
-P a0f107ca66f825cc1fd10b15157b22fd9cc0f95c
-R 2a77d36b9d379fa39cee995a7b6ac780
+P e6bc8aa80824a9156e78fc99b5ac7045b97d29c3
+R a1595d94360f07506cd424fa5219917d
 U drh
-Z ebf8b5ec73a9dc2627883459f07e7b7c
+Z 4dcf250616b0eecc7cd0cb15ba666c1d
diff --git a/manifest.uuid b/manifest.uuid
index 40ae21b745..c3ec5091ce 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-e6bc8aa80824a9156e78fc99b5ac7045b97d29c3
\ No newline at end of file
+9d4f43f030438b3e7358032de2e04132b80e04a8
\ No newline at end of file
diff --git a/src/select.c b/src/select.c
index c362c02dd8..7fae4be4b7 100644
--- a/src/select.c
+++ b/src/select.c
@@ -12,7 +12,7 @@
 ** This file contains C code routines that are called by the parser
 ** to handle SELECT statements in SQLite.
 **
-** $Id: select.c,v 1.198 2004/07/19 23:16:39 drh Exp $
+** $Id: select.c,v 1.199 2004/07/19 23:38:11 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -324,13 +324,12 @@ static void pushOntoSorter(Parse *pParse, Vdbe *v, ExprList *pOrderBy){
 ** Add code to implement the OFFSET and LIMIT
 */
 static void codeLimiter(
-  Parse *pParse,    /* Parsing context */
+  Vdbe *v,          /* Generate code into this VM */
   Select *p,        /* The SELECT statement being coded */
   int iContinue,    /* Jump here to skip the current record */
   int iBreak,       /* Jump here to end the loop */
   int nPop          /* Number of times to pop stack when jumping */
 ){
-  Vdbe *v = pParse->pVdbe;
   if( p->iOffset>=0 ){
     int addr = sqlite3VdbeCurrentAddr(v) + 2;
     if( nPop>0 ) addr++;
@@ -380,7 +379,7 @@ static int selectInnerLoop(
   */
   hasDistinct = distinct>=0 && pEList && pEList->nExpr>0;
   if( pOrderBy==0 && !hasDistinct ){
-    codeLimiter(pParse, p, iContinue, iBreak, 0);
+    codeLimiter(v, p, iContinue, iBreak, 0);
   }
 
   /* Pull the requested columns.
@@ -413,7 +412,7 @@ static int selectInnerLoop(
     sqlite3VdbeAddOp(v, OP_String8, 0, 0);
     sqlite3VdbeAddOp(v, OP_PutStrKey, distinct, 0);
     if( pOrderBy==0 ){
-      codeLimiter(pParse, p, iContinue, iBreak, nColumn);
+      codeLimiter(v, p, iContinue, iBreak, nColumn);
     }
   }
 
@@ -582,7 +581,7 @@ static void generateSortTail(
   }
   sqlite3VdbeOp3(v, OP_Sort, 0, 0, (char*)pInfo, P3_KEYINFO_HANDOFF);
   addr = sqlite3VdbeAddOp(v, OP_SortNext, 0, end1);
-  codeLimiter(pParse, p, addr, end2, 1);
+  codeLimiter(v, p, addr, end2, 1);
   switch( eDest ){
     case SRT_Table:
     case SRT_TempTable: {
diff --git a/test/limit.test b/test/limit.test
index 9282f0e3a2..8ac822fd63 100644
--- a/test/limit.test
+++ b/test/limit.test
@@ -12,7 +12,7 @@
 # focus of this file is testing the LIMIT ... OFFSET ... clause
 #  of SELECT statements.
 #
-# $Id: limit.test,v 1.14 2004/07/19 23:16:39 drh Exp $
+# $Id: limit.test,v 1.15 2004/07/19 23:38:11 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -90,7 +90,6 @@ do_test limit-3.1 {
   }
 } {50 51 52 53 54}
 
-btree_breakpoint
 do_test limit-4.1 {
   execsql {
     BEGIN;
@@ -295,17 +294,23 @@ do_test limit-7.12 {
   }
 } {30}
 
-# Tests for limit in conjunction with distinct
+# Tests for limit in conjunction with distinct.  The distinct should
+# occur before both the limit and the offset.  Ticket #749.
 #
 do_test limit-8.1 {
   execsql {
-    SELECT DISTINCT x/100 FROM t3 LIMIT 5;
+    SELECT DISTINCT round(x/100) FROM t3 LIMIT 5;
   }
 } {0 1 2 3 4}
 do_test limit-8.2 {
   execsql {
-    SELECT DISTINCT x/100 FROM t3 LIMIT 5 OFFSET 5;
+    SELECT DISTINCT round(x/100) FROM t3 LIMIT 5 OFFSET 5;
   }
 } {5 6 7 8 9}
+do_test limit-8.3 {
+  execsql {
+    SELECT DISTINCT round(x/100) FROM t3 LIMIT 5 OFFSET 25;
+  }
+} {25 26 27 28 29}
 
 finish_test