percona-toolkit/t/pt-visual-explain/samples/impossible_having.sql

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explain extended select * from t1 having 0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
	`explain extended select * from t1 having 0;`
	`id select_type table type possible_keys key key_len ref rows filtered Extra`
	`1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible HAVING`