MDEV-15262 Wrong results for SELECT..WHERE non_indexed_datetime_column=indexed_time_column

3 files changed, 74 insertions, 0 deletions

diff --git a/mysql-test/r/type_time_6065.result b/mysql-test/r/type_time_6065.result
index db3efc3bcbb..1f64f9e90e2 100644
--- a/mysql-test/r/type_time_6065.result
+++ b/mysql-test/r/type_time_6065.result
@@ -2308,3 +2308,47 @@ col_int_nokey
 1
 DROP TABLE t1,t2,t3;
 SET TIMESTAMP=0;
+#
+# MDEV-15262 Wrong results for SELECT..WHERE non_indexed_datetime_column=indexed_time_column
+#
+SET TIMESTAMP=UNIX_TIMESTAMP('2012-01-31 10:14:35');
+CREATE TABLE t1 (col_time_key TIME, KEY(col_time_key));
+CREATE TABLE t2 (col_datetime_key DATETIME);
+INSERT INTO t1 VALUES ('-760:00:00'),('760:00:00');
+INSERT INTO t1 VALUES ('-770:00:00'),('770:00:00');
+INSERT INTO t2 SELECT * FROM t1;
+SELECT * FROM t2 STRAIGHT_JOIN t1 IGNORE INDEX(col_time_key) WHERE col_time_key = col_datetime_key;
+col_datetime_key	col_time_key
+2011-12-30 08:00:00	-760:00:00
+2012-03-02 16:00:00	760:00:00
+2011-12-29 22:00:00	-770:00:00
+2012-03-03 02:00:00	770:00:00
+SELECT * FROM t2 STRAIGHT_JOIN t1 FORCE INDEX (col_time_key) WHERE col_time_key = col_datetime_key;
+col_datetime_key	col_time_key
+2011-12-29 22:00:00	-770:00:00
+2011-12-30 08:00:00	-760:00:00
+2012-03-02 16:00:00	760:00:00
+2012-03-03 02:00:00	770:00:00
+INSERT INTO t1 VALUES ('-838:59:59'),('838:59:59');
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '-838:59:59' HOUR_SECOND));
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '838:59:59' HOUR_SECOND));
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '-839:00:00' HOUR_SECOND));
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '839:00:00' HOUR_SECOND));
+SELECT * FROM t2 STRAIGHT_JOIN t1 IGNORE INDEX(col_time_key) WHERE col_time_key = col_datetime_key;
+col_datetime_key	col_time_key
+2011-12-30 08:00:00	-760:00:00
+2012-03-02 16:00:00	760:00:00
+2011-12-29 22:00:00	-770:00:00
+2012-03-03 02:00:00	770:00:00
+2011-12-27 01:00:01	-838:59:59
+2012-03-05 22:59:59	838:59:59
+SELECT * FROM t2 STRAIGHT_JOIN t1 FORCE INDEX (col_time_key) WHERE col_time_key = col_datetime_key;
+col_datetime_key	col_time_key
+2011-12-29 22:00:00	-770:00:00
+2011-12-30 08:00:00	-760:00:00
+2012-03-02 16:00:00	760:00:00
+2012-03-03 02:00:00	770:00:00
+2011-12-27 01:00:01	-838:59:59
+2012-03-05 22:59:59	838:59:59
+DROP TABLE t1, t2;
+SET TIMESTAMP=DEFAULT;
diff --git a/mysql-test/t/type_time_6065.test b/mysql-test/t/type_time_6065.test
index 6e29b849be5..fc91c530760 100644
--- a/mysql-test/t/type_time_6065.test
+++ b/mysql-test/t/type_time_6065.test
@@ -172,6 +172,29 @@ eval $query;
 DROP TABLE t1,t2,t3;
 SET TIMESTAMP=0; # back to current time
 
+
+--echo #
+--echo # MDEV-15262 Wrong results for SELECT..WHERE non_indexed_datetime_column=indexed_time_column
+--echo #
+
+SET TIMESTAMP=UNIX_TIMESTAMP('2012-01-31 10:14:35');
+CREATE TABLE t1 (col_time_key TIME, KEY(col_time_key));
+CREATE TABLE t2 (col_datetime_key DATETIME);
+INSERT INTO t1 VALUES ('-760:00:00'),('760:00:00');
+INSERT INTO t1 VALUES ('-770:00:00'),('770:00:00');
+INSERT INTO t2 SELECT * FROM t1;
+SELECT * FROM t2 STRAIGHT_JOIN t1 IGNORE INDEX(col_time_key) WHERE col_time_key = col_datetime_key;
+SELECT * FROM t2 STRAIGHT_JOIN t1 FORCE INDEX (col_time_key) WHERE col_time_key = col_datetime_key;
+INSERT INTO t1 VALUES ('-838:59:59'),('838:59:59');
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '-838:59:59' HOUR_SECOND));
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '838:59:59' HOUR_SECOND));
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '-839:00:00' HOUR_SECOND));
+INSERT INTO t2 VALUES (DATE_ADD(CURRENT_DATE, INTERVAL '839:00:00' HOUR_SECOND));
+SELECT * FROM t2 STRAIGHT_JOIN t1 IGNORE INDEX(col_time_key) WHERE col_time_key = col_datetime_key;
+SELECT * FROM t2 STRAIGHT_JOIN t1 FORCE INDEX (col_time_key) WHERE col_time_key = col_datetime_key;
+DROP TABLE t1, t2;
+SET TIMESTAMP=DEFAULT;
+
 #
 # End of 10.0 tests
 #
diff --git a/sql/field.cc b/sql/field.cc
index c36fff06a07..a9a7d54929b 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -5330,6 +5330,13 @@ static void calc_datetime_days_diff(MYSQL_TIME *ltime, long days)
                            ltime->second) * 1000000LL +
                            ltime->second_part);
     unpack_time(timediff, ltime);
+    /*
+      unpack_time() broke down hours into ltime members hour,day,month.
+      Mix them back to ltime->hour using the same factors
+      that pack_time()/unpack_time() use (i.e. 32 for month).
+    */
+    ltime->hour+= (ltime->month * 32 + ltime->day) * 24;
+    ltime->month= ltime->day= 0;
   }
   ltime->time_type= MYSQL_TIMESTAMP_TIME;
 }