MDEV-17161 TRUNCATE TABLE fails after upgrade from 10.1

With the TRUNCATE by rename, create, drop (MDEV-13564),
old tables with invalid ROW_FORMAT attribute could not be
truncated. Introduce a sloppy mode for allowing the TRUNCATE.

create_table_info_t::prepare_create_table(): Add the parameter
strict=true.

ha_innobase::create(): Pass strict=false if trx!=NULL
(the create is part of TRUNCATE).

storage/innobase/handler/ha_innodb.cc

@@ -12478,9 +12478,7 @@ create_table_info_t::gcols_in_fulltext_or_spatial()
 /** Prepare to create a new table to an InnoDB database.
 @param[in]	name	Table name
 @return error number */
-int
-create_table_info_t::prepare_create_table(
-	const char*		name)
+int create_table_info_t::prepare_create_table(const char* name, bool strict)
 {
 	DBUG_ENTER("prepare_create_table");
 
@@ -12503,7 +12501,7 @@ create_table_info_t::prepare_create_table(
 	because InnoDB might actually support the option, but not under
 	the current conditions.  The messages revealing the specific
 	problems are reported inside this function. */
-	if (create_options_are_invalid()) {
+	if (strict && create_options_are_invalid()) {
 		DBUG_RETURN(HA_WRONG_CREATE_OPTION);
 	}
 
@@ -12851,7 +12849,7 @@ ha_innobase::create(
 				     file_per_table, trx);
 
 	if ((error = info.initialize())
-	    || (error = info.prepare_create_table(name))) {
+	    || (error = info.prepare_create_table(name, !trx))) {
 		if (trx) {
 			trx_rollback_for_mysql(trx);
 			row_mysql_unlock_data_dictionary(trx);

storage/innobase/handler/ha_innodb.h

@@ -702,7 +702,7 @@ class create_table_info_t
 	bool create_option_tablespace_is_valid();
 
 	/** Prepare to create a table. */
-	int prepare_create_table(const char*		name);
+	int prepare_create_table(const char* name, bool strict = true);
 
 	void allocate_trx();