Fix a first timestamp column in the sql-based table discovery

sql/table.cc

@@ -2136,6 +2136,7 @@ int TABLE_SHARE::init_from_sql_statement_string(THD *thd, bool write,
   if (tabledef_version.str)
     thd->lex->create_info.tabledef_version= tabledef_version;
 
+  promote_first_timestamp_column(&thd->lex->alter_info.create_list);
   file= mysql_create_frm_image(thd, db.str, table_name.str,
                                &thd->lex->create_info, &thd->lex->alter_info,
                                C_ORDINARY_CREATE, &unused1, &unused2, &frm);

storage/test_sql_discovery/mysql-test/sql_discovery/simple.result

@@ -123,7 +123,7 @@ show create table t1;
 Table	Create Table
 t1	CREATE TABLE t1 (
   a int(11) NOT NULL DEFAULT '5',
-  b timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
+  b timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   c tinyblob,
   d decimal(5,2) DEFAULT NULL,
   e varchar(30) CHARACTER SET ascii DEFAULT NULL,