MDEV-18876 Assertion `is_valid_time_slow()' failed in Time::valid_MYSQL_TIME_to_valid_value

mysql-test/include/type_hrtime.inc

@@ -55,6 +55,12 @@ select * from t1;
 delete from t1 where a < 20110101;
 select * from t1;
 
+if ($type == time)
+{
+delete from t1 where a is not null;
+select * from t1;
+}
+
 #
 # create ... select
 #

mysql-test/main/type_time.result

@@ -188,7 +188,7 @@ create table t1(f1 time);
 insert into t1 values ('23:38:57');
 select f1, f1 = '2010-10-11 23:38:57' from t1;
 f1	f1 = '2010-10-11 23:38:57'
-23:38:57	0
+23:38:57	1
 drop table t1;
 #
 # MDEV-4634 Crash in CONVERT_TZ
@@ -2186,5 +2186,27 @@ Warnings:
 Warning	1264	Out of range value for column 't' at row 1
 DROP TABLE t1;
 #
+# MDEV-18876 Assertion `is_valid_time_slow()' failed in Time::valid_MYSQL_TIME_to_valid_value
+#
+CREATE TABLE t1 (f INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT DISTINCT f FROM t1 ORDER BY 1 && ( '1972-11-06 16:58:58' BETWEEN CONVERT( 0, TIME ) AND '20:31:05' );
+f
+1
+2
+DROP TABLE t1;
+CREATE OR REPLACE TABLE t1 (a VARCHAR(32));
+INSERT INTO t1 VALUES ('1972-11-06 16:58:58');
+SELECT * FROM t1 WHERE a < TIME'20:31:05';
+a
+1972-11-06 16:58:58
+SELECT a < TIME'20:31:05' FROM t1;
+a < TIME'20:31:05'
+1
+DROP TABLE t1;
+SELECT '1972-11-06 16:58:58' < TIME'20:31:05';
+'1972-11-06 16:58:58' < TIME'20:31:05'
+1
+#
 # End of 10.4 tests
 #

mysql-test/main/type_time.test

@@ -1430,6 +1430,23 @@ INSERT INTO t1 VALUES (3e19);
 DROP TABLE t1;
 
 
+--echo #
+--echo # MDEV-18876 Assertion `is_valid_time_slow()' failed in Time::valid_MYSQL_TIME_to_valid_value
+--echo #
+
+CREATE TABLE t1 (f INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT DISTINCT f FROM t1 ORDER BY 1 && ( '1972-11-06 16:58:58' BETWEEN CONVERT( 0, TIME ) AND '20:31:05' );
+DROP TABLE t1;
+
+CREATE OR REPLACE TABLE t1 (a VARCHAR(32));
+INSERT INTO t1 VALUES ('1972-11-06 16:58:58');
+SELECT * FROM t1 WHERE a < TIME'20:31:05';
+SELECT a < TIME'20:31:05' FROM t1;
+DROP TABLE t1;
+
+SELECT '1972-11-06 16:58:58' < TIME'20:31:05';
+
 --echo #
 --echo # End of 10.4 tests
 --echo #

mysql-test/main/type_time_hires.result

@@ -67,8 +67,10 @@ a
 01:02:03.4567
 select extract(microsecond from a + interval 100 microsecond) from t1 where a>'2010-11-12 01:02:03.456';
 extract(microsecond from a + interval 100 microsecond)
+456800
 select a from t1 where a>'2010-11-12 01:02:03.456' group by a;
 a
+01:02:03.4567
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
@@ -115,6 +117,11 @@ NULL
 delete from t1 where a < 20110101;
 select * from t1;
 a
+01:02:13.3332
+NULL
+delete from t1 where a is not null;
+select * from t1;
+a
 NULL
 create table t2 select * from t1;
 create table t3 like t1;

sql/item.cc

@@ -129,6 +129,20 @@ longlong Item::val_datetime_packed_result(THD *thd)
 }
 
 
+longlong Item::val_time_packed_result(THD *thd)
+{
+  MYSQL_TIME ltime;
+  if (get_date_result(thd, &ltime, Time::Options_cmp(thd)))
+    return 0;
+  if (ltime.time_type == MYSQL_TIMESTAMP_TIME)
+    return pack_time(&ltime);
+  int warn= 0;
+  Time tmp(&warn, &ltime, 0);
+  DBUG_ASSERT(tmp.is_valid_time());
+  return tmp.to_packed();
+}
+
+
 /*
   For the items which don't have its own fast val_str_ascii()
   implementation we provide a generic slower version,

sql/item.h

@@ -1708,12 +1708,7 @@ class Item: public Value_source,
     return Time(thd, this, Time::Options_cmp(thd)).to_packed();
   }
   longlong val_datetime_packed_result(THD *thd);
-  longlong val_time_packed_result(THD *thd)
-  {
-    MYSQL_TIME ltime;
-    return get_date_result(thd, &ltime, Time::Options_cmp(thd)) ? 0 :
-           pack_time(&ltime);
-  }
+  longlong val_time_packed_result(THD *thd);
 
   virtual bool get_date_result(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate)
   { return get_date(thd, ltime,fuzzydate); }