In TRUNCATE TABLE, clear the 'instant' status of a table. TODO: Do the same...

In TRUNCATE TABLE, clear the 'instant' status of a table. TODO: Do the same when the table becomes empty

dict_col_t::remove_instant(): Remove the instantness of a column.

dict_index_t::remove_instant(): Remove the instantness of a clustered index.

storage/innobase/include/dict0mem.h

@@ -645,6 +645,14 @@ struct dict_col_t{
 		*len = def_val.len;
 		return static_cast<const byte*>(def_val.data);
 	}
+
+	/** Remove the 'instant ADD' status of the column */
+	void remove_instant()
+	{
+		DBUG_ASSERT(is_instant());
+		def_val.len = UNIV_SQL_DEFAULT;
+		def_val.data = NULL;
+	}
 };
 
 /** Index information put in a list of virtual column structure. Index
@@ -1059,6 +1067,16 @@ struct dict_index_t{
 		return fields[n].col->instant_value(len);
 	}
 
+	/** Remove the 'instant ADD' status of a clustered index */
+	void remove_instant()
+	{
+		DBUG_ASSERT(is_clust());
+		for (unsigned i = n_core_fields; i < n_fields; i++) {
+			fields[i].col->remove_instant();
+		}
+		n_core_fields = n_fields;
+	}
+
 	/** Check whether two indexes have the same metadata.
 	@param[in]	old	the other index
 	@param[in]	add	whether to ignore added fields in other

storage/innobase/row/row0trunc.cc

@@ -1882,6 +1882,8 @@ row_truncate_table_for_mysql(
 	we need to use index locks to sync up */
 	dict_table_x_lock_indexes(table);
 
+	dict_table_get_first_index(table)->remove_instant();
+
 	if (!dict_table_is_temporary(table)) {
 
 		if (is_file_per_table) {
@@ -1950,17 +1952,12 @@ row_truncate_table_for_mysql(
 			return(row_truncate_complete(
 				table, trx, fsp_flags, logger, DB_ERROR));
 		}
-	}
 
 		DBUG_EXECUTE_IF("ib_trunc_crash_after_redo_log_write_complete",
 				log_buffer_flush_to_disk();
 				os_thread_sleep(3000000);
 				DBUG_SUICIDE(););
 
-	/* Step-9: Drop all indexes (free index pages associated with these
-	indexes) */
-	if (!dict_table_is_temporary(table)) {
-
 		DropIndex	dropIndex(table, no_redo);
 
 		err = SysIndexIterator().for_each(dropIndex);
@@ -2108,6 +2105,8 @@ row_truncate_table_for_mysql(
 		trx_commit_for_mysql(trx);
 	}
 
+	ut_ad(!table->is_instant());
+
 	return(row_truncate_complete(table, trx, fsp_flags, logger, err));
 }