MDEV-31334: Consider dates ending in 'T' as malformed

According to ISO 8601 standard, 'T' should be followed by the time of
day. If a date ends with only 'T', throw an error in strict mode and a
warning in other modes.

All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer Amazon Web
Services, Inc.

mysql-test/main/func_extract.result

@@ -368,6 +368,8 @@ EXTRACT(DAY FROM '01-02-03')
 SELECT EXTRACT(DAY FROM '24:02:03T');
 EXTRACT(DAY FROM '24:02:03T')
 3
+Warnings:
+Warning	1292	Truncated incorrect date value: '24:02:03T'
 SELECT EXTRACT(DAY FROM '24-02-03');
 EXTRACT(DAY FROM '24-02-03')
 3
@@ -380,33 +382,63 @@ EXTRACT(DAY FROM '11111')
 SELECT TIME('2001-01-01T'), TIME('2001-01-01T ');
 TIME('2001-01-01T')	TIME('2001-01-01T ')
 00:00:00	00:00:00
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001-01-01T'
+Warning	1292	Truncated incorrect date value: '2001-01-01T '
 SELECT TIME('2001/01/01T'), TIME('2001/01/01T ');
 TIME('2001/01/01T')	TIME('2001/01/01T ')
 00:00:00	00:00:00
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001/01/01T'
+Warning	1292	Truncated incorrect date value: '2001/01/01T '
 SELECT TIME('2001:01:01T'), TIME('2001:01:01T ');
 TIME('2001:01:01T')	TIME('2001:01:01T ')
 00:00:00	00:00:00
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001:01:01T'
+Warning	1292	Truncated incorrect date value: '2001:01:01T '
 SELECT EXTRACT(DAY FROM '2001-01-01T'), EXTRACT(DAY FROM '2001-01-01T ');
 EXTRACT(DAY FROM '2001-01-01T')	EXTRACT(DAY FROM '2001-01-01T ')
 1	1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001-01-01T'
+Warning	1292	Truncated incorrect date value: '2001-01-01T '
 SELECT EXTRACT(DAY FROM '2001/01/01T'), EXTRACT(DAY FROM '2001/01/01T ');
 EXTRACT(DAY FROM '2001/01/01T')	EXTRACT(DAY FROM '2001/01/01T ')
 1	1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001/01/01T'
+Warning	1292	Truncated incorrect date value: '2001/01/01T '
 SELECT EXTRACT(DAY FROM '2001:01:01T'), EXTRACT(DAY FROM '2001:01:01T ');
 EXTRACT(DAY FROM '2001:01:01T')	EXTRACT(DAY FROM '2001:01:01T ')
 1	1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001:01:01T'
+Warning	1292	Truncated incorrect date value: '2001:01:01T '
 SELECT TIME('2001:01:01T'), TIME('2001:01:01T ');
 TIME('2001:01:01T')	TIME('2001:01:01T ')
 00:00:00	00:00:00
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001:01:01T'
+Warning	1292	Truncated incorrect date value: '2001:01:01T '
 SELECT EXTRACT(HOUR FROM '2001-01-01T'), EXTRACT(HOUR FROM '2001-01-01T ');
 EXTRACT(HOUR FROM '2001-01-01T')	EXTRACT(HOUR FROM '2001-01-01T ')
 0	0
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001-01-01T'
+Warning	1292	Truncated incorrect date value: '2001-01-01T '
 SELECT EXTRACT(HOUR FROM '2001/01/01T'), EXTRACT(HOUR FROM '2001/01/01T ');
 EXTRACT(HOUR FROM '2001/01/01T')	EXTRACT(HOUR FROM '2001/01/01T ')
 0	0
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001/01/01T'
+Warning	1292	Truncated incorrect date value: '2001/01/01T '
 SELECT EXTRACT(HOUR FROM '2001:01:01T'), EXTRACT(HOUR FROM '2001:01:01T ');
 EXTRACT(HOUR FROM '2001:01:01T')	EXTRACT(HOUR FROM '2001:01:01T ')
 0	0
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001:01:01T'
+Warning	1292	Truncated incorrect date value: '2001:01:01T '
 # This still parses as DATE and returns NULL (without trying TIME)
 SELECT EXTRACT(DAY FROM '100000:02:03T');
 EXTRACT(DAY FROM '100000:02:03T')

mysql-test/main/func_time.result

@@ -6253,6 +6253,9 @@ Warning	1292	Truncated incorrect time value: '1 2 '
 SELECT TIME('2001-01-01T'), TIME('2001-01-01T ');
 TIME('2001-01-01T')	TIME('2001-01-01T ')
 00:00:00	00:00:00
+Warnings:
+Warning	1292	Truncated incorrect date value: '2001-01-01T'
+Warning	1292	Truncated incorrect date value: '2001-01-01T '
 SELECT TIME('901-01-01T1'), TIME('901-01-01T10');
 TIME('901-01-01T1')	TIME('901-01-01T10')
 01:00:00	10:00:00

sql-common/my_time.c

@@ -171,6 +171,8 @@ static int get_date_time_separator(uint *number_of_fields,
   if (*s == 'T')
   {
     (*str)++;
+    if (s + 1 >= end)
+      return 1;
     return 0;
   }