MDEV-6443: Server crashed with assertaion failure in file

ha_innodb.cc line 8473

If index is not found from InnoDB make sure we print what we
were trying to find and all mysql and InnoDB index names there
is for this table.

storage/innobase/handler/ha_innodb.cc

@@ -7963,6 +7963,14 @@ ha_innobase::innobase_get_index(
 		index = innobase_index_lookup(share, keynr);
 
 		if (index) {
+			if (!key || ut_strcmp(index->name, key->name) != 0) {
+				fprintf(stderr, "InnoDB: [Error] Index for key no %u"
+					" mysql name %s , InnoDB name %s for table %s\n",
+					keynr, key ? key->name : "NULL",
+					index->name,
+					prebuilt->table->name);
+			}
+
 			ut_a(ut_strcmp(index->name, key->name) == 0);
 		} else {
 			/* Can't find index with keynr in the translation

storage/xtradb/handler/ha_innodb.cc

@@ -8473,6 +8473,15 @@ ha_innobase::innobase_get_index(
 		index = innobase_index_lookup(share, keynr);
 
 		if (index) {
+
+			if (!key || ut_strcmp(index->name, key->name) != 0) {
+				fprintf(stderr, "InnoDB: [Error] Index for key no %u"
+					" mysql name %s , InnoDB name %s for table %s\n",
+					keynr, key ? key->name : "NULL",
+					index->name,
+					prebuilt->table->name);
+			}
+
 			ut_a(ut_strcmp(index->name, key->name) == 0);
 		} else {
 			/* Can't find index with keynr in the translation