bk commit into 5.0 tree (tnurnberg:1.2597) BUG#32770

[Tatjana A Nuernberg]

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ChangeSet@stripped, 2007-12-10 09:17:18+01:00, tnurnberg@stripped +3 -0
  Bug#32770: LAST_DAY() returns a DATE, but somehow internally keeps track of the TIME.
  
  LAST_DAY() says it returns a DATE, not a DATETIME, but didn't zero the time fields.
  Adapted from a patch kindly supplied by Claudio Cherubino.

  mysql-test/r/func_time.result@stripped, 2007-12-10 09:17:16+01:00, tnurnberg@stripped +3 -0
    show that LAST_DAY() returns only a DATE, not a DATETIME

  mysql-test/t/func_time.test@stripped, 2007-12-10 09:17:17+01:00, tnurnberg@stripped +7 -0
    show that LAST_DAY() returns only a DATE, not a DATETIME

  sql/item_timefunc.cc@stripped, 2007-12-10 09:17:17+01:00, tnurnberg@stripped +2 -0
    zero time-fields as we return only a DATE

diff -Nrup a/mysql-test/r/func_time.result b/mysql-test/r/func_time.result
--- a/mysql-test/r/func_time.result	2007-11-16 17:43:13 +01:00
+++ b/mysql-test/r/func_time.result	2007-12-10 09:17:16 +01:00
@@ -1282,4 +1282,7 @@ DATE_ADD('20071108',       INTERVAL 1 DA
 select DATE_ADD(20071108,         INTERVAL 1 DAY);
 DATE_ADD(20071108,         INTERVAL 1 DAY)
 2007-11-09
+select LAST_DAY('2007-12-06 08:59:19.05') - INTERVAL 1 SECOND;
+LAST_DAY('2007-12-06 08:59:19.05') - INTERVAL 1 SECOND
[phone]:59:59
 End of 5.0 tests
diff -Nrup a/mysql-test/t/func_time.test b/mysql-test/t/func_time.test
--- a/mysql-test/t/func_time.test	2007-11-16 17:43:14 +01:00
+++ b/mysql-test/t/func_time.test	2007-12-10 09:17:17 +01:00
@@ -797,4 +797,11 @@ select DATE_ADD(20071108181000,   INTERV
 select DATE_ADD('20071108',       INTERVAL 1 DAY);
 select DATE_ADD(20071108,         INTERVAL 1 DAY);
 
+#
+# Bug#32770: LAST_DAY() returns a DATE, but somehow internally keeps
+#            track of the TIME.
+#
+
+select LAST_DAY('2007-12-06 08:59:19.05') - INTERVAL 1 SECOND;
+
 --echo End of 5.0 tests
diff -Nrup a/sql/item_timefunc.cc b/sql/item_timefunc.cc
--- a/sql/item_timefunc.cc	2007-11-14 14:24:02 +01:00
+++ b/sql/item_timefunc.cc	2007-12-10 09:17:17 +01:00
@@ -3411,6 +3411,8 @@ bool Item_func_last_day::get_date(MYSQL_
   ltime->day= days_in_month[month_idx];
   if ( month_idx == 1 && calc_days_in_year(ltime->year) == 366)
     ltime->day= 29;
+  ltime->hour= ltime->minute= ltime->second= 0;
+  ltime->second_part= 0;
   ltime->time_type= MYSQL_TIMESTAMP_DATE;
   return 0;
 }