check_digest() tests

DIGEST independed testing for performance_schema events.

mysql-test/include/check_digest.inc

@@ -0,0 +1,34 @@
+#
+# check_digest() checks digests validity from performance_schema.events_statements_summary_by_digest
+#
+
+--disable_query_log
+create table test._digests(d varchar(32) primary key);
+
+delimiter ~~;
+create function test.check_digest(digest varchar(255))
+returns tinyint
+not deterministic
+begin
+  declare digest_exists tinyint;
+  if length(digest) != 32 or conv(digest, 16, 10) = 0 then
+    return 0;
+  end if;
+  select exists (select d from test._digests where d = digest) into digest_exists;
+  if digest_exists then
+    return 0;
+  end if;
+  #insert into test._digests values (digest);
+  return 1;
+end~~
+
+create procedure test.reset_digests()
+begin
+  delete from test._digests;
+end~~
+delimiter ;~~
+
+--disable_result_log
+call sys.ps_truncate_all_tables(false);
+--enable_result_log
+--enable_query_log

mysql-test/include/check_digest_end.inc

@@ -0,0 +1,9 @@
+#
+# Deinit for check_digest.inc
+#
+
+--disable_query_log
+drop table test._digests;
+drop function test.check_digest;
+drop procedure test.reset_digests;
+--enable_query_log