Index: src/test_spellfix.c
==================================================================
--- src/test_spellfix.c
+++ src/test_spellfix.c
@@ -2678,10 +2678,22 @@
       if( strcmp(zCmd,"reset")==0 ){
         /* Reset the  edit cost table (if there is one). */
         editDist3ConfigDelete(p->pConfig3);
         p->pConfig3 = 0;
         return SQLITE_OK;
+      }
+      if( memcmp(zCmd,"edit_cost_table=",16)==0 ){
+        editDist3ConfigDelete(p->pConfig3);
+        p->pConfig3 = 0;
+        sqlite3_free(p->zCostTable);
+        p->zCostTable = spellfix1Dequote(zCmd+16);
+        if( p->zCostTable==0 ) return SQLITE_NOMEM;
+        if( p->zCostTable[0]==0 || sqlite3_stricmp(p->zCostTable,"null")==0 ){
+          sqlite3_free(p->zCostTable);
+          p->zCostTable = 0;
+        }
+        return SQLITE_OK;
       }
       pVTab->zErrMsg = sqlite3_mprintf("unknown value for %s.command: \"%w\"",
                                        p->zTableName, zCmd);
       return SQLITE_ERROR;
     }

Index: test/spellfix.test
==================================================================
--- test/spellfix.test
+++ test/spellfix.test
@@ -134,18 +134,54 @@
   foreach w $vocab {
     execsql { INSERT INTO t3(word) VALUES($w) }
   }
 } {}
 
-breakpoint
 foreach {tn word res} {
   1   kos*     {kosher 3 kiosk 4 kudo 2 kiss 3 kissed 3}
   2   kellj*   {killjoy 5 kill 4 killed 4 killer 4 killers 4}
   3   kellj    {kill 4 kills 5 killjoy 7 keel 4 killed 6}
 } {
-  do_execsql_test 1.2.$tn {
+  do_execsql_test 3.2.$tn {
     SELECT word, matchlen FROM t3 WHERE word MATCH $word
      ORDER BY score, word LIMIT 5
   } $res
-} 
+}
+
+do_execsql_test 4.0 {
+  INSERT INTO t3(command) VALUES('edit_cost_table=NULL');
+}
+foreach {tn word res} {
+  1   kosher     {kosher 0 kisser 51 kissers 76 kissed 126 kisses 126}
+  2   kellj      {keels 60 killjoy 68 kills 80 keel 120 kill 125}
+  3   kashar     {kosher 80 kisser 91 kissers 116 kissed 166 kisses 166}
+} {
+  do_execsql_test 4.1.$tn {
+    SELECT word, distance FROM t3 WHERE word MATCH $word
+     ORDER BY score, word LIMIT 5
+  } $res
+}
+do_execsql_test 5.0 {
+  CREATE TABLE costs2(iLang, cFrom, cTo, iCost);
+  INSERT INTO costs2 VALUES(0, 'a', 'o', 1);
+  INSERT INTO costs2 VALUES(0, 'e', 'o', 4);
+  INSERT INTO costs2 VALUES(0, 'i', 'o', 8);
+  INSERT INTO costs2 VALUES(0, 'u', 'o', 16);
+  INSERT INTO t3(command) VALUES('edit_cost_table="costs2"');
+}
+
+foreach {tn word res} {
+  1   kasher     {kosher 1}
+  2   kesher     {kosher 4}
+  3   kisher     {kosher 8}
+  4   kosher     {kosher 0}
+  5   kusher     {kosher 16}
+} {
+  do_execsql_test 5.1.$tn {
+    SELECT word, distance FROM t3 WHERE word MATCH $word
+     ORDER BY score, word LIMIT 1
+  } $res
+}
+
+
 
 finish_test