row0vers.c, row0sel.c:

  Backport the clust rec bug fix from 4.0


innobase/row/row0sel.c:
  Backport the clust rec bug fix from 4.0
innobase/row/row0vers.c:
  Backport the clust rec bug fix from 4.0

innobase/row/row0sel.c

@@ -598,7 +598,14 @@ row_sel_get_clust_rec(
 
 	clust_rec = btr_pcur_get_rec(&(plan->clust_pcur));
 
-	ut_ad(page_rec_is_user_rec(clust_rec));
+	if (!page_rec_is_user_rec(clust_rec)
+            || btr_pcur_get_low_match(&(plan->clust_pcur))
+	       < dict_index_get_n_unique(index)) {
+
+	       clust_rec = NULL;
+
+	       goto func_exit;
+	}
 
 	if (!node->read_view) {
 		/* Try to place a lock on the index record */
@@ -661,6 +668,7 @@ row_sel_get_clust_rec(
 	
 	row_sel_fetch_columns(index, clust_rec,
 					UT_LIST_GET_FIRST(plan->columns));
+func_exit:
 	*out_rec = clust_rec;
 
 	return(DB_SUCCESS);
@@ -2206,7 +2214,17 @@ row_sel_get_clust_rec_for_mysql(
 
 	clust_rec = btr_pcur_get_rec(prebuilt->clust_pcur);
 
-	ut_ad(page_rec_is_user_rec(clust_rec));
+	/* Note: only if the search ends up on a non-infimum record is the
+	low_match value the real match to the search tuple */
+
+	if (!page_rec_is_user_rec(clust_rec)
+	    || btr_pcur_get_low_match(prebuilt->clust_pcur)
+	       < dict_index_get_n_unique(clust_index)) {
+
+	       clust_rec = NULL;
+
+	       goto func_exit;
+	}
 
 	if (prebuilt->select_lock_type != LOCK_NONE) {
 		/* Try to place a lock on the index record */
@@ -2268,6 +2286,7 @@ row_sel_get_clust_rec_for_mysql(
 		}
 	}
 
+func_exit:
 	*out_rec = clust_rec;
 
 	if (prebuilt->select_lock_type == LOCK_X) {

innobase/row/row0vers.c

@@ -76,23 +76,9 @@ row_vers_impl_x_locked_off_kernel(
 	clust_rec = row_get_clust_rec(BTR_SEARCH_LEAF, rec, index,
 							&clust_index, &mtr);
 	if (!clust_rec) {
-	        rec_sprintf(err_buf, 900, rec);
-
-	        ut_print_timestamp(stderr);
-	        fprintf(stderr,
-"  InnoDB: Error: cannot find the clustered index record\n"
-"InnoDB: for a secondary index record in table %s index %s.\n"
-"InnoDB: Secondary index record %s.\n"
-"InnoDB: The table is probably corrupt. Please run CHECK TABLE on it.\n"
-"InnoDB: You can try to repair the table by dump + drop + reimport.\n"
-"InnoDB: Send a detailed bug report to mysql@lists.mysql.com.\n",
-		  index->table_name, index->name, err_buf);
 	        mutex_enter(&kernel_mutex);
 	        mtr_commit(&mtr);
 
-	        /* We assume there is no lock on the record, though this
-	        is not certain because the table is apparently corrupt */
-
 	        return(NULL);
 	}