MDEV-6065 MySQL Bug#13623473 "MISSING ROWS ON SELECT AND JOIN WITH TIME/DATETIME COMPARE"

fix for ref like "indexed_time = datetime"

mysql-test/t/type_time_6065.test

+#
+# MDEV-6065 MySQL Bug#13623473 "MISSING ROWS ON SELECT AND JOIN WITH TIME/DATETIME COMPARE"
+#
+
+# Systematic testing of ref access and range scan
+
+SET TIMESTAMP=UNIX_TIMESTAMP('2012-01-31 10:14:35');
+
+CREATE TABLE t1 (col_time_key TIME, KEY(col_time_key));
+INSERT INTO t1 VALUES ('00:00:00'),('-24:00:00'),('-48:00:00'),('24:00:00'),('48:00:00');
+CREATE TABLE t2 (col_datetime_key DATETIME, KEY(col_datetime_key));
+INSERT INTO t2 SELECT * FROM t1;
+
+let $cnt_0=5;
+let $operator= =;
+# For operator in =, >=, >, <=, <
+while ($cnt_0)
+{  
+  let $cnt_1=2;
+  let $first_table=t1;
+  # for table in t1,t2
+  while ($cnt_1)
+  {
+    if ($first_table==t1)
+    {
+      let $first_index=col_time_key;
+      let $second_table=t2;
+      let $second_index=col_datetime_key;
+    }
+    if ($first_table==t2)
+    {
+      let $first_index=col_datetime_key;
+      let $second_table=t1;
+      let $second_index=col_time_key;
+    }
+    let $cnt_2=2;
+    let $first_index_hint=ignore;
+    # for first_index_hint in ignore,force
+    while ($cnt_2)
+    {
+      let $cnt_3=2;
+      let $second_index_hint=ignore;
+      # for second_index_hint in ignore, force
+      while ($cnt_3)
+      {
+        let $cnt_4=2;
+        let $first_operand=col_time_key;
+        # for first_operand in col_time_key, col_datetime_key
+        while ($cnt_4)
+        {
+          if ($first_operand==col_time_key)
+          {
+            let $second_operand=col_datetime_key;
+          }
+          if ($first_operand==col_datetime_key)
+          {
+            let $second_operand=col_time_key;
+          }
+  
+          eval EXPLAIN EXTENDED SELECT * FROM
+               $first_table $first_index_hint INDEX ($first_index)
+               STRAIGHT_JOIN
+               $second_table $second_index_hint INDEX ($second_index)
+               WHERE $first_operand $operator $second_operand;
+          --sorted_result
+          eval SELECT * FROM
+               $first_table $first_index_hint INDEX ($first_index)
+               STRAIGHT_JOIN
+               $second_table $second_index_hint INDEX ($second_index)
+               WHERE $first_operand $operator $second_operand;
+  
+          let $first_operand=col_datetime_key;
+          dec $cnt_4;
+        }
+        let $second_index_hint=force;
+        dec $cnt_3;
+      }
+      let $first_index_hint=force;
+      dec $cnt_2;
+    }
+    let $first_table=t2;
+    dec $cnt_1;
+  }
+  if ($cnt_0==5)
+  {
+    let $operator= >=;
+  }
+  if ($cnt_0==4)
+  {
+    let $operator= >;
+  }
+  if ($cnt_0==3)
+  {
+    let $operator= <=;
+  }
+  if ($cnt_0==2)
+  {
+    let $operator= <;
+  }
+  dec $cnt_0;
+}
+
+DROP TABLE t1,t2;
+
+#
+# Original test of the bug report
+#
+
+CREATE TABLE t1 (
+  pk INT NOT NULL AUTO_INCREMENT,
+  col_int_nokey INT,
+  col_int_key INT NOT NULL,
+  PRIMARY KEY (pk),
+  KEY col_int_key (col_int_key)
+);
+
+INSERT INTO t1 VALUES (10,1,7), (11,7,0), (12,4,9), (13,7,3),
+(14,0,4), (15,2,2), (16,9,5), (17,4,3), (18,0,1), (19,9,3), (20,1,6),
+(21,3,7), (22,8,5), (23,8,1), (24,18,204), (25,84,224), (26,6,9),
+(27,3,5), (28,6,0), (29,6,3);
+
+CREATE TABLE t2 (
+  col_int_nokey INT NOT NULL,
+  col_datetime_key DATETIME NOT NULL,
+  col_varchar_key VARCHAR(1) NOT NULL,
+  KEY col_datetime_key (col_datetime_key),
+  KEY col_varchar_key (col_varchar_key)
+);
+
+INSERT INTO t2 VALUES (1,'2001-11-04 19:07:55','k');
+
+CREATE TABLE t3 (
+  col_time_key TIME,
+  KEY col_time_key (col_time_key)
+);
+
+INSERT INTO t3 VALUES ('21:22:34'), ('10:50:38'), ('00:21:38'),
+('04:08:02'), ('16:25:11'), ('10:14:58'), ('19:47:59'), ('11:14:24'),
+('00:00:00'), ('00:00:00'), ('15:57:25'), ('07:05:51'), ('19:22:21'),
+('03:53:16'), ('09:16:38'), ('15:37:26'), ('00:00:00'), ('05:03:03'),
+('02:59:24'), ('00:01:58');
+
+let $query=SELECT * FROM t2 STRAIGHT_JOIN t3 FORCE INDEX (col_time_key)
+           ON t3.col_time_key > t2.col_datetime_key;
+eval EXPLAIN EXTENDED $query;
+--sorted_result
+eval $query;
+
+let $query=SELECT * FROM t2 STRAIGHT_JOIN t3 IGNORE INDEX (col_time_key)
+           ON t3.col_time_key > t2.col_datetime_key;
+eval EXPLAIN EXTENDED $query;
+--sorted_result
+eval $query;
+
+let $query=SELECT outr.col_int_nokey
+FROM t2 as outr
+  STRAIGHT_JOIN t3 AS outr2
+  ON outr2.col_time_key > outr.col_datetime_key
+WHERE outr.col_int_nokey IN (
+  SELECT col_int_key
+  FROM t1 AS innr
+  WHERE innr.pk >= innr.col_int_nokey
+) AND (
+  outr.col_int_nokey <= 6
+  OR
+  outr.col_varchar_key IS NULL
+);
+eval EXPLAIN EXTENDED $query;
+--sorted_result
+eval $query;
+
+DROP TABLE t1,t2,t3;
+SET TIMESTAMP=0; # back to current time
+
+#
+# End of 10.0 tests
+#

sql/field.cc

@@ -5316,12 +5316,41 @@ int Field_time::store(const char *from,uint len,CHARSET_INFO *cs)
 }
 
 
+/**
+  subtract a given number of days from DATETIME, return TIME
+
+  optimized version of calc_time_diff()
+
+  @note it might generate TIME values outside of the valid TIME range!
+*/
+static void calc_datetime_days_diff(MYSQL_TIME *ltime, long days)
+{
+  long daydiff= calc_daynr(ltime->year, ltime->month, ltime->day) - days;
+  ltime->year= ltime->month= 0;
+  if (daydiff >=0 )
+    ltime->day= daydiff;
+  else
+  {
+    longlong timediff= ((((daydiff        * 24LL +
+                           ltime->hour)   * 60LL +
+                           ltime->minute) * 60LL +
+                           ltime->second) * 1000000LL +
+                           ltime->second_part);
+    unpack_time(timediff, ltime);
+  }
+  ltime->time_type= MYSQL_TIMESTAMP_TIME;
+}
+
+
 int Field_time::store_time_dec(MYSQL_TIME *ltime, uint dec)
 {
   MYSQL_TIME l_time= *ltime;
   ErrConvTime str(ltime);
   int was_cut= 0;
 
+  if (curdays && l_time.time_type != MYSQL_TIMESTAMP_TIME)
+    calc_datetime_days_diff(&l_time, curdays);
+
   int have_smth_to_conv= !check_time_range(&l_time, decimals(), &was_cut);
   return store_TIME_with_warning(&l_time, &str, was_cut, have_smth_to_conv);
 }
@@ -5358,6 +5387,28 @@ int Field_time::store(longlong nr, bool unsigned_val)
 }
 
 
+void Field_time::set_curdays(THD *thd)
+{
+  MYSQL_TIME ltime;
+  set_current_date(thd, &ltime);
+  curdays= calc_daynr(ltime.year, ltime.month, ltime.day);
+}
+
+
+Field *Field_time::new_key_field(MEM_ROOT *root, TABLE *new_table,
+                                 uchar *new_ptr, uint32 length,
+                                 uchar *new_null_ptr, uint new_null_bit)
+{
+  THD *thd= get_thd();
+  Field_time *res=
+    (Field_time*) Field::new_key_field(root, new_table, new_ptr, length,
+                                       new_null_ptr, new_null_bit);
+  if (!(thd->variables.old_behavior & OLD_MODE_ZERO_DATE_TIME_CAST) && res)
+    res->set_curdays(thd);
+  return res;
+}
+
+
 double Field_time::val_real(void)
 {
   ASSERT_COLUMN_MARKED_FOR_READ;

sql/field.h

@@ -1852,6 +1852,12 @@ class Field_newdate :public Field_temporal_with_date {
 
 
 class Field_time :public Field_temporal {
+  /*
+    when this Field_time instance is used for storing values for index lookups
+    (see class store_key, Field::new_key_field(), etc), the following
+    might be set to TO_DAYS(CURDATE()). See also Field_time::store_time_dec()
+  */
+  long curdays;
 protected:
   virtual void store_TIME(MYSQL_TIME *ltime);
   int store_TIME_with_warning(MYSQL_TIME *ltime, const ErrConv *str,
@@ -1861,7 +1867,7 @@ class Field_time :public Field_temporal {
              uchar null_bit_arg, enum utype unireg_check_arg,
              const char *field_name_arg)
     :Field_temporal(ptr_arg, length_arg, null_ptr_arg, null_bit_arg,
-                    unireg_check_arg, field_name_arg)
+                    unireg_check_arg, field_name_arg), curdays(0)
     {}
   enum_field_types type() const { return MYSQL_TYPE_TIME;}
   enum ha_base_keytype key_type() const { return HA_KEYTYPE_INT24; }
@@ -1880,6 +1886,10 @@ class Field_time :public Field_temporal {
   uint32 pack_length() const { return 3; }
   void sql_type(String &str) const;
   uint size_of() const { return sizeof(*this); }
+  void set_curdays(THD *thd);
+  Field *new_key_field(MEM_ROOT *root, TABLE *new_table,
+                       uchar *new_ptr, uint32 length,
+                       uchar *new_null_ptr, uint new_null_bit);
 };
 
 

sql/sql_time.cc

@@ -1259,8 +1259,7 @@ mix_date_and_time(MYSQL_TIME *to, const MYSQL_TIME *from)
 /**
   Get current date in DATE format
 */
-static void
-set_current_date(THD *thd, MYSQL_TIME *to)
+void set_current_date(THD *thd, MYSQL_TIME *to)
 {
   thd->variables.time_zone->gmt_sec_to_TIME(to, thd->query_start());
   thd->time_zone_used= 1;

sql/sql_time.h

@@ -33,6 +33,7 @@ typedef struct st_known_date_time_format KNOWN_DATE_TIME_FORMAT;
 
 ulong convert_period_to_month(ulong period);
 ulong convert_month_to_period(ulong month);
+void set_current_date(THD *thd, MYSQL_TIME *to);
 bool time_to_datetime(MYSQL_TIME *ltime);
 void time_to_daytime_interval(MYSQL_TIME *l_time);
 bool get_date_from_daynr(long daynr,uint *year, uint *month, uint *day);