[t:2745], fix in main, get is_index_unique to check if thd->killed is set

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@21288 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -2978,6 +2978,8 @@ int ha_tokudb::is_index_unique(bool* is_unique, DB_TXN* txn, DB* db, KEY* key_in
     DBC* tmp_cursor1 = NULL;
     DBC* tmp_cursor2 = NULL;
     DBT key1, key2, val, packed_key1, packed_key2;
+    u_int64_t cnt = 0;
+    THD* thd = ha_thd();
     bzero(&key1, sizeof(key1));
     bzero(&key2, sizeof(key2));
     bzero(&val, sizeof(val));
@@ -3093,6 +3095,15 @@ int ha_tokudb::is_index_unique(bool* is_unique, DB_TXN* txn, DB* db, KEY* key_in
             DB_NEXT
             );
         if (error && (error != DB_NOTFOUND)) { goto cleanup; }
+
+        cnt++;
+        if (cnt%10000) {
+            if (thd->killed) {
+                my_error(ER_QUERY_INTERRUPTED, MYF(0));
+                error = ER_QUERY_INTERRUPTED;
+                goto cleanup;
+            }
+        }
     }
 
     error = 0;