MDEV-4838 Wrong metadata for DATE_ADD('string', INVERVAL)

The problem seems to be fixed by some earlier change
and is not reproducible any longer. Only adding a test case.

mysql-test/r/func_time.result

@@ -2374,3 +2374,11 @@ EXTRACT(HOUR FROM TIME('1 02:00:00'))	EXTRACT(HOUR FROM TIME('26:00:00'))
 SELECT EXTRACT(DAY FROM TIME('1 02:00:00')), EXTRACT(DAY FROM TIME('26:00:00'));
 EXTRACT(DAY FROM TIME('1 02:00:00'))	EXTRACT(DAY FROM TIME('26:00:00'))
 1	1
+#
+# MDEV-4838 Wrong metadata for DATE_ADD('string', INVERVAL)
+#
+SELECT DATE_ADD('2011-01-02 12:13:14', INTERVAL 1 MINUTE);
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					DATE_ADD('2011-01-02 12:13:14', INTERVAL 1 MINUTE)	254	19	19	Y	0	0	8
+DATE_ADD('2011-01-02 12:13:14', INTERVAL 1 MINUTE)
+2011-01-02 12:14:14

mysql-test/t/func_time.test

@@ -1449,3 +1449,11 @@ SELECT EXTRACT(HOUR FROM '1 02:00:00'), EXTRACT(HOUR FROM '26:00:00');
 SELECT EXTRACT(HOUR FROM TIME'1 02:00:00'), EXTRACT(HOUR FROM TIME'26:00:00');
 SELECT EXTRACT(HOUR FROM TIME('1 02:00:00')), EXTRACT(HOUR FROM TIME('26:00:00'));
 SELECT EXTRACT(DAY FROM TIME('1 02:00:00')), EXTRACT(DAY FROM TIME('26:00:00'));
+
+
+--echo #
+--echo # MDEV-4838 Wrong metadata for DATE_ADD('string', INVERVAL)
+--echo #
+--enable_metadata
+SELECT DATE_ADD('2011-01-02 12:13:14', INTERVAL 1 MINUTE);
+--disable_metadata