Avoid an error in sqlite3expert if the database has existing indexes on expressions.

FossilOrigin-Name: f1d76c8636866424fe0b57d8814b8bb1a0ed4e2ca1b75d8e308d4b962ad8dc3b

ext/expert/expert1.test

@@ -428,6 +428,8 @@ do_execsql_test 5.0 {
 
   WITH s(i) AS ( VALUES(1) UNION ALL SELECT i+1 FROM s WHERE i<100)
   INSERT INTO t2 SELECT (i-1)/20, (i-1)/5 FROM s;
+
+  CREATE INDEX i1 ON t1( lower(a) );
 }
 do_candidates_test 5.1 {
   SELECT * FROM t1,t2 WHERE (b=? OR a=?) AND (c=? OR d=?)
@@ -457,6 +459,7 @@ do_execsql_test 5.3 {
   ANALYZE;
   SELECT * FROM sqlite_stat1 ORDER BY 1, 2;
 } {
+  t1 i1 {100 50} 
   t1 t1_idx_00000061 {100 50} 
   t1 t1_idx_00000062 {100 20}
   t1 t1_idx_000123a7 {100 50 17}

ext/expert/sqlite3expert.c

@@ -1623,6 +1623,11 @@ static int idxPopulateOneStat1(
     const char *zComma = zCols==0 ? "" : ", ";
     const char *zName = (const char*)sqlite3_column_text(pIndexXInfo, 0);
     const char *zColl = (const char*)sqlite3_column_text(pIndexXInfo, 1);
+    if( zName==0 ){
+      /* This index contains an expression. Ignore it. */
+      sqlite3_free(zCols);
+      return sqlite3_reset(pIndexXInfo);
+    }
     zCols = idxAppendText(&rc, zCols, 
         "%sx.%Q IS sqlite_expert_rem(%d, x.%Q) COLLATE %s", 
         zComma, zName, nCol, zName, zColl

manifest

@@ -1,5 +1,5 @@
-C Remove\san\sALWAYS()\sthat\scan\ssometimes\sbe\sfalse,\swith\swildly\sincorrect\sSQL\ninputs.\s\sdbsqlfuzz\s707afcf73930de2624cdeca0ad1f0deea982dfea
-D 2024-09-24T00:53:27.928
+C Avoid\san\serror\sin\ssqlite3expert\sif\sthe\sdatabase\shas\sexisting\sindexes\son\sexpressions.
+D 2024-09-24T11:26:21.974
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -57,8 +57,8 @@ F ext/consio/console_io.c d2b74afae8d301de2e8447b1045fcd33eb59df13bf581d906d99c7
 F ext/consio/console_io.h b5ebe34aa15b357621ebbea3d3f2e2b24750d4280b5802516409e23947fd9ee5
 F ext/expert/README.md b321c2762bb93c18ea102d5a5f7753a4b8bac646cb392b3b437f633caf2020c3
 F ext/expert/expert.c d548d603a4cc9e61f446cc179c120c6713511c413f82a4a32b1e1e69d3f086a4
-F ext/expert/expert1.test 661f873fd451127edf822ef0d520088faa319135f6a15bd10be6801ac284ac9b
-F ext/expert/sqlite3expert.c 8b09aeb2b95a9fca8b6628b522bf4d69aa746ff64c38eb1e99a9b5fad8cf03b9
+F ext/expert/expert1.test fd13123932d60f535e2d589d704dc259d2f00e98e1ddc09deb807d1655aef9d1
+F ext/expert/sqlite3expert.c 79d90612e43ba71818a5d458412489ff80f0c01449e324f83c0d795ef1993974
 F ext/expert/sqlite3expert.h ca81efc2679a92373a13a3e76a6138d0310e32be53d6c3bfaedabd158ea8969b
 F ext/expert/test_expert.c b767b2039a0df707eb3147e86bcf68b252d8455d9a41774b1a836cd052ceca70
 F ext/fts3/README.content b9078d0843a094d86af0d48dffbff13c906702b4c3558012e67b9c7cc3bf59ee
@@ -2213,8 +2213,8 @@ F vsixtest/vsixtest.tcl 6195aba1f12a5e10efc2b8c0009532167be5e301abe5b31385638080
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 9a1fc8d36b5b262f9d17a4743b4b9bb54510cf257d2d9778ebc42d5224856b1e
-R d5e0e0bf96e6589b06b08a7ed11d078b
-U drh
-Z 402b4730d643c0eedb6276888911042c
+P 766cf5535b9f51decd88c1736b988def929a90f68eb6a52bcaa21bb321586a08
+R f0b2fb4d0f36e0f6f4e7bc3a0dfe75ab
+U dan
+Z e6e4bf2a760ba7d64af8767b4d70ff5b
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-766cf5535b9f51decd88c1736b988def929a90f68eb6a52bcaa21bb321586a08
+f1d76c8636866424fe0b57d8814b8bb1a0ed4e2ca1b75d8e308d4b962ad8dc3b