Be more aggressive about freeing memory associated with the

sqlite3_index_info.idxStr field.

FossilOrigin-Name: 85dcd0a8479a658203833cfd75f22813faa26d4793ebfbb8843035d683bee105

manifest

@@ -1,5 +1,5 @@
-C Have\sfts5.xBestIndex\sreturn\sSQLITE_CONSTRAINT,\sinstead\sof\sa\slarge\scost,\swhen\sno\susable\splan\scan\sbe\sfound.
-D 2024-06-01T17:56:58.279
+C Be\smore\saggressive\sabout\sfreeing\smemory\sassociated\swith\sthe\nsqlite3_index_info.idxStr\sfield.
+D 2024-06-02T10:52:35.141
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -840,7 +840,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c 887fc4ca3f020ebb2e376f222069570834ac63bf50111ef0cbf3ae417048ed89
 F src/wal.h ba252daaa94f889f4b2c17c027e823d9be47ce39da1d3799886bbd51f0490452
 F src/walker.c 7c7ea0115345851c3da4e04e2e239a29983b61fb5b038b94eede6aba462640e2
-F src/where.c ddffcd89b1b794a3d7ce56ac31315ae7a5625313046f6aff3942a682b3fa0d48
+F src/where.c 233c668403a0afd83ad1211235f42601b62b95fbfd893f93bfeb0df6bf384245
 F src/whereInt.h 002adc3aa2cc10733b9b27958fdbe893987cd989fab25a9853941c1f9b9b0a65
 F src/wherecode.c d5184620bcb5265d59072cb66e1386bfe0331a9ce7614286f9ab79a4fcd00fb8
 F src/whereexpr.c 67d15caf88a1a9528283d68ff578e024cf9fe810b517bb0343e5aaf695ad97dd
@@ -2194,8 +2194,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ff4a30056f8dbcbd045afdbee485f6671c3580b95187144aa9a77c97dfda2647
-R 884536d5c578ec6faaf09891deb9b65a
-U dan
-Z 7e4839dea4a455e242c808d50043956b
+P 7c470945372dc98610f7c9840ce8cab18c19b655352f0187e4f31040cea77363
+R 63d264a5691dbac02e2f4fc53ea495d4
+U drh
+Z 6b7afb3ccb4c7001ae92721661549344
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-7c470945372dc98610f7c9840ce8cab18c19b655352f0187e4f31040cea77363
+85dcd0a8479a658203833cfd75f22813faa26d4793ebfbb8843035d683bee105

src/where.c

@@ -1564,6 +1564,17 @@ static sqlite3_index_info *allocateIndexInfo(
   return pIdxInfo;
 }
 
+/*
+** Free and zero the sqlite3_index_info.idxStr value if needed.
+*/
+static void freeIdxStr(sqlite3_index_info *pIdxInfo){
+  if( pIdxInfo->needToFreeIdxStr ){
+    sqlite3_free(pIdxInfo->idxStr);
+    pIdxInfo->idxStr = 0;
+    pIdxInfo->needToFreeIdxStr = 0;
+  }
+}  
+
 /*
 ** Free an sqlite3_index_info structure allocated by allocateIndexInfo()
 ** and possibly modified by xBestIndex methods.
@@ -1579,6 +1590,7 @@ static void freeIndexInfo(sqlite3 *db, sqlite3_index_info *pIdxInfo){
     sqlite3ValueFree(pHidden->aRhs[i]); /* IMP: R-14553-25174 */
     pHidden->aRhs[i] = 0;
   }
+  freeIdxStr(pIdxInfo);
   sqlite3DbFree(db, pIdxInfo);
 }
 
@@ -4210,6 +4222,7 @@ static int whereLoopAddVirtualOne(
       ** Make no entries in the loop table.
       */
       WHERETRACE(0xffffffff, ("  ^^^^--- non-viable plan rejected!\n"));
+      freeIdxStr(pIdxInfo);
       return SQLITE_OK;
     }
     return rc;
@@ -4232,7 +4245,7 @@ static int whereLoopAddVirtualOne(
        || pIdxCons->usable==0
       ){
         sqlite3ErrorMsg(pParse,"%s.xBestIndex malfunction",pSrc->pTab->zName);
-        testcase( pIdxInfo->needToFreeIdxStr );
+        freeIdxStr(pIdxInfo);
         return SQLITE_ERROR;
       }
       testcase( iTerm==nConstraint-1 );
@@ -4282,11 +4295,7 @@ static int whereLoopAddVirtualOne(
         ** the plan cannot be used. In these cases set variable *pbRetryLimit
         ** to true to tell the caller to retry with LIMIT and OFFSET 
         ** disabled. */
-        if( pIdxInfo->needToFreeIdxStr ){
-          sqlite3_free(pIdxInfo->idxStr);
-          pIdxInfo->idxStr = 0;
-          pIdxInfo->needToFreeIdxStr = 0;
-        }
+        freeIdxStr(pIdxInfo);
         *pbRetryLimit = 1;
         return SQLITE_OK;
       }
@@ -4299,7 +4308,7 @@ static int whereLoopAddVirtualOne(
       /* The non-zero argvIdx values must be contiguous.  Raise an
       ** error if they are not */
       sqlite3ErrorMsg(pParse,"%s.xBestIndex malfunction",pSrc->pTab->zName);
-      testcase( pIdxInfo->needToFreeIdxStr );
+      freeIdxStr(pIdxInfo);
       return SQLITE_ERROR;
     }
   }
@@ -4595,7 +4604,6 @@ static int whereLoopAddVirtual(
     }
   }
 
-  if( p->needToFreeIdxStr ) sqlite3_free(p->idxStr);
   freeIndexInfo(pParse->db, p);
   WHERETRACE(0x800, ("END %s.addVirtual(), rc=%d\n", pSrc->pTab->zName, rc));
   return rc;