TRUNCATE TABLE performance_schema.events_statements_summary_by_digest;
NULL
NULL
NULL
NULL
NULL	NULL
NULL	NULL
NULL	NULL	NULL	1	2	3	NULL	NULL
NULL	NULL	NULL	1	2	3	NULL	NULL
1 IS NULL
0
2 IS NOT NULL
1
1 IS NULL	2 IS NULL	3 IS NOT NULL	4 IS NOT NULL
0	0	1	1
SELECT SCHEMA_NAME, DIGEST_TEXT, COUNT_STAR
FROM performance_schema.events_statements_summary_by_digest;
SCHEMA_NAME	DIGEST_TEXT	COUNT_STAR
test	TRUNCATE TABLE `performance_schema` . `events_statements_summary_by_digest` 	1
test	SELECT ? 	1
test	SELECT ? FROM DUAL 	1
test	SELECT ?, ... 	2
test	SELECT ? IS NULL 	1
test	SELECT ? IS NOT NULL 	1
test	SELECT ? IS NULL , ? IS NULL , ? IS NOT NULL , ? IS NOT NULL 	1
test	CREATE TABLE `foo` ( `a` INTEGER DEFAULT ? , `b` INTEGER NOT NULL DEFAULT ? , `c` INTEGER NOT NULL ) 	1
test	DROP TABLE `foo` 	1