From: drh <>
Date: Mon, 13 Oct 2025 12:36:54 +0000 (+0000)
Subject: Fix a bug in concat_ws() in which an initial empty string was treated as if
X-Git-Tag: major-release~79
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a8bb50ce954c299f1b2e16203e6f81858b73c7c9;p=thirdparty%2Fsqlite.git

Fix a bug in concat_ws() in which an initial empty string was treated as if
it was a NULL value.

FossilOrigin-Name: eb2e4e46171c12f59aa5d571eeb310534360b110c3e7bda6eaf68f0e25546264
---

diff --git a/manifest b/manifest
index d35c87d0ef..cbf15bc717 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Enable\sCLI\sdocumentation\sfor\s.imposter
-D 2025-10-13T10:35:59.250
+C Fix\sa\sbug\sin\sconcat_ws()\sin\swhich\san\sinitial\sempty\sstring\swas\streated\sas\sif\nit\swas\sa\sNULL\svalue.
+D 2025-10-13T12:36:54.800
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -688,7 +688,7 @@ F src/delete.c 03a77ba20e54f0f42ebd8eddf15411ed6bdb06a2c472ac4b6b336521bf7cea42
 F src/expr.c 4d63c8f6d50fe20637de8bdaf57757a0e424e4ac5e2c3313e621d64727a48a1c
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 928ed2517e8732113d2b9821aa37af639688d752f4ea9ac6e0e393d713eeb76f
-F src/func.c 338477566488c2c7aa0244793b89973c4708b76264d86a5e5ba75f5bf2eed0bd
+F src/func.c c845e41f679a5012612956d76abfc226ad30167a83dd51bf5b21d185db6e8ee4
 F src/global.c a19e4b1ca1335f560e9560e590fc13081e21f670643367f99cb9e8f9dc7d615b
 F src/hash.c 73934a7f7ab1cb110614a9388cb516893b0cf5b7b69e4fd1a0780ac4ce166be7
 F src/hash.h 46b92795a95bfefb210f52f0c316e9d7cdbcdd7e7fcfb0d8be796d3a5767cddf
@@ -1229,7 +1229,7 @@ F test/func5.test 863e6d1bd0013d09c17236f8a13ea34008dd857d87d85a13a673960e4c25d8
 F test/func6.test 3bc89ec0f2605736d3a118f43d25ef58115a7db4dba8ae939a363917d815c0bb
 F test/func7.test 7e009275f52c52954c8c028fdb62f8bc16cc47276fcc8753c1d2b22c6e074598
 F test/func8.test c4e2ecacf9f16e47a245e7a25fbabcc7e78f9c7c41a80f158527cdfdc6dd299d
-F test/func9.test 8901e97e2c3a52e5ea06a0f0c6199212957c7d6c3f727056a96abf5b81928512
+F test/func9.test 32c7d53b9bc99ddd45fad29457add438f2aca43d24920793773a96b13610f552
 F test/fuzz-oss1.test 514dcabb24687818ea949fa6760229eaacad74ca70157743ef36d35bbe01ffb0
 F test/fuzz.test 819ea7e483bcee91209aacbe6f9eaf3287baa1841479ee5f639f57c5e7c42b86
 F test/fuzz2.test 76dc35b32b6d6f965259508508abce75a6c4d7e1
@@ -2169,8 +2169,8 @@ F tool/version-info.c 33d0390ef484b3b1cb685d59362be891ea162123cea181cb8e6d2cf6dd
 F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
 F tool/warnings.sh 1ad0169b022b280bcaaf94a7fa231591be96b514230ab5c98fbf15cd7df842dd
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 62e6b120c43cd855349bf1b40ad2fb992e31a6e2567e5b145cf1849445849da7
-R 37532e5130fb3bbf62f35db739d1b62b
+P c639c7be029f86defe6cb8cef094e1126ec8ab3968e12d4d2bf6e6ab23c39821
+R 026307b0239a686e0724688b43180fba
 U drh
-Z 5fd8e579740325669c29fb5e0f42dc50
+Z 424a5e33a5014577fba5010ea33cae54
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index cf03cf65f7..b6ef29c4d4 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-c639c7be029f86defe6cb8cef094e1126ec8ab3968e12d4d2bf6e6ab23c39821
+eb2e4e46171c12f59aa5d571eeb310534360b110c3e7bda6eaf68f0e25546264
diff --git a/src/func.c b/src/func.c
index add2eb6c97..09b4ec1f86 100644
--- a/src/func.c
+++ b/src/func.c
@@ -1669,6 +1669,7 @@ static void concatFuncCore(
 ){
   i64 j, n = 0;
   int i;
+  int bNotNull = 0;   /* True after at least NOT NULL argument seen */
   char *z;
   for(i=0; i<argc; i++){
     n += sqlite3_value_bytes(argv[i]);
@@ -1685,12 +1686,13 @@ static void concatFuncCore(
       int k = sqlite3_value_bytes(argv[i]);
       const char *v = (const char*)sqlite3_value_text(argv[i]);
       if( v!=0 ){
-        if( j>0 && nSep>0 ){
+        if( bNotNull && nSep>0 ){
           memcpy(&z[j], zSep, nSep);
           j += nSep;
         }
         memcpy(&z[j], v, k);
         j += k;
+        bNotNull = 1;
       }
     }
   }
diff --git a/test/func9.test b/test/func9.test
index fd2db55c19..d24d5f7beb 100644
--- a/test/func9.test
+++ b/test/func9.test
@@ -29,6 +29,15 @@ do_execsql_test func9-130 {
 do_execsql_test func9-131 {
   SELECT concat_ws(',',1,2,3,4,'',6,7,8,NULL,9,10,11,12);
 } {1,2,3,4,,6,7,8,9,10,11,12}
+do_execsql_test func9-132 {
+  SELECT concat_ws(',','',2,3,4,'',6,7,8,NULL,9,10,11,12);
+} {,2,3,4,,6,7,8,9,10,11,12}
+do_execsql_test func9-133 {
+  SELECT concat_ws(',',NULL,'',3,4,'',6,7,8,NULL,9,10,11,12);
+} {,3,4,,6,7,8,9,10,11,12}
+do_execsql_test func9-134 {
+  SELECT concat_ws(',',NULL,NULL,NULL,'',3,4,'',6,7,8,NULL,9,10,11,12);
+} {,3,4,,6,7,8,9,10,11,12}
 do_execsql_test func9-140 {
   SELECT concat_ws(NULL,1,2,3,4,5,6,7,8,NULL,9,10,11,12);
 } {{}}