MDEV-15406 NO_ZERO_IN_DATE erroneously affects how CAST(AS DATE) warns about fractional digit truncation

mysql-test/main/func_time.result

@@ -1105,7 +1105,7 @@ week(20061108), week(20061108.01), week(20061108085411.000002);
 isnull(week(now() + 0))	isnull(week(now() + 0.2))	week(20061108)	week(20061108.01)	week(20061108085411.000002)
 0	0	45	45	45
 Warnings:
-Warning	1292	Truncated incorrect datetime value: '20061108.01'
+Note	1292	Truncated incorrect datetime value: '20061108.01'
 End of 4.1 tests
 select time_format('100:00:00', '%H %k %h %I %l');
 time_format('100:00:00', '%H %k %h %I %l')

mysql-test/main/type_date.result

@@ -962,5 +962,31 @@ Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where coalesce(<cache>(DATE'2001-01-02'),`test`.`t1`.`a`) <=> coalesce(DATE'2001-01-01',`test`.`t1`.`a`)
 DROP TABLE t1;
 #
+# MDEV-15406 NO_ZERO_IN_DATE erroneously affects how CAST(AS DATE) warns about fractional digit truncation
+#
+SET sql_mode='';
+CREATE TABLE t1 (a DATE);
+SELECT CAST(20061108.01 AS DATE);
+CAST(20061108.01 AS DATE)
+2006-11-08
+Warnings:
+Note	1292	Truncated incorrect datetime value: '20061108.01'
+INSERT INTO t1 VALUES (20061108.01);
+Warnings:
+Note	1265	Data truncated for column 'a' at row 1
+DROP TABLE t1;
+SET sql_mode=NO_ZERO_IN_DATE;
+SELECT CAST(20061108.01 AS DATE);
+CAST(20061108.01 AS DATE)
+2006-11-08
+Warnings:
+Note	1292	Truncated incorrect datetime value: '20061108.01'
+CREATE TABLE t1 (a DATE);
+INSERT INTO t1 VALUES (20061108.01);
+Warnings:
+Note	1265	Data truncated for column 'a' at row 1
+DROP TABLE t1;
+SET sql_mode=DEFAULT;
+#
 # End of 10.4 tests
 #

mysql-test/main/type_date.test

@@ -646,6 +646,25 @@ EXECUTE IMMEDIATE 'EXPLAIN EXTENDED SELECT * FROM t1 WHERE COALESCE(?,a)<=>COALE
 
 DROP TABLE t1;
 
+
+--echo #
+--echo # MDEV-15406 NO_ZERO_IN_DATE erroneously affects how CAST(AS DATE) warns about fractional digit truncation
+--echo #
+
+SET sql_mode='';
+CREATE TABLE t1 (a DATE);
+SELECT CAST(20061108.01 AS DATE);
+INSERT INTO t1 VALUES (20061108.01);
+DROP TABLE t1;
+
+SET sql_mode=NO_ZERO_IN_DATE;
+SELECT CAST(20061108.01 AS DATE);
+CREATE TABLE t1 (a DATE);
+INSERT INTO t1 VALUES (20061108.01);
+DROP TABLE t1;
+SET sql_mode=DEFAULT;
+
+
 --echo #
 --echo # End of 10.4 tests
 --echo #

sql/sql_type.cc

@@ -215,60 +215,34 @@ void Sec6::make_truncated_warning(THD *thd, const char *type_str) const
 }
 
 
-bool Sec6::to_time_with_warn(MYSQL_TIME *to, const ErrConv *str,
-                             const char *field_name) const
-{
-  int was_cut;
-  bool res= to_time(to, &was_cut);
-  if (res || MYSQL_TIME_WARN_HAVE_WARNINGS(was_cut))
-    current_thd->
-      push_warning_wrong_or_truncated_value(Sql_condition::WARN_LEVEL_WARN,
-                                            res, "time", str->ptr(),
-                                            field_name);
-  return res;
-}
-
-
-bool Sec6::to_datetime_with_warn(MYSQL_TIME *to, ulonglong fuzzydate,
-                                 const ErrConv *str,
-                                 const char *field_name) const
-{
-  bool res, have_warnings= false;
-  int was_cut;
-  res= to_datetime(to, fuzzydate, &was_cut);
-  have_warnings= was_cut && (fuzzydate & TIME_NO_ZERO_IN_DATE);
-  if (res || have_warnings)
-    current_thd->
-      push_warning_wrong_or_truncated_value(Sql_condition::WARN_LEVEL_WARN,
-                                            res, "datetime", str->ptr(),
-                                            field_name);
-  return res;
-}
-
-
 bool Sec6::convert_to_mysql_time(MYSQL_TIME *ltime, ulonglong fuzzydate,
                                  const ErrConv *str, const char *field_name)
                                  const
 {
+  int warn;
   bool is_time= fuzzydate & TIME_TIME_ONLY;
+  const char *typestr= is_time ? "time" : "datetime";
+  bool rc= is_time ? to_time(ltime, &warn) :
+                     to_datetime(ltime, fuzzydate, &warn);
   if (truncated())
   {
-    /*
+    // The value was already truncated at the constructor call time
-      The value was already truncated at the constructor call time,
-      and a truncation warning was issued. Here we convert silently
-      to avoid double warnings.
-    */
     current_thd->
       push_warning_wrong_or_truncated_value(Sql_condition::WARN_LEVEL_WARN,
-                                            !is_time,
+                                            !is_time, typestr,
-                                            is_time ? "time" : "datetime",
                                             str->ptr(), field_name);
-    int warn;
-    return is_time ? to_time(ltime, &warn) :
-                     to_datetime(ltime, fuzzydate, &warn);
   }
-  return is_time ? to_time_with_warn(ltime, str, field_name) :
+  else if (rc || MYSQL_TIME_WARN_HAVE_WARNINGS(warn))
-                   to_datetime_with_warn(ltime, fuzzydate, str, field_name);
+    current_thd->
+      push_warning_wrong_or_truncated_value(Sql_condition::WARN_LEVEL_WARN,
+                                            rc, typestr, str->ptr(),
+                                            field_name);
+  else if (MYSQL_TIME_WARN_HAVE_NOTES(warn))
+    current_thd->
+      push_warning_wrong_or_truncated_value(Sql_condition::WARN_LEVEL_NOTE,
+                                            rc, typestr, str->ptr(),
+                                            field_name);
+  return rc;
 }
 
 

sql/sql_type.h

@@ -273,8 +273,6 @@ public:
   {
     return number_to_time(m_neg, m_sec, m_usec, to, warn);
   }
-  bool to_time_with_warn(MYSQL_TIME *to, const ErrConv *str,
-                         const char *field_name) const;
   /*
     Convert a number in format YYYYMMDDhhmmss.ff to
     TIMESTAMP'YYYY-MM-DD hh:mm:ss.ff'
@@ -288,8 +286,6 @@ public:
     }
     return number_to_datetime(m_sec, m_usec, to, flags, warn) == -1;
   }
-  bool to_datetime_with_warn(MYSQL_TIME *to, ulonglong fuzzydate,
-                             const ErrConv *str, const char *field_name) const;
   // Convert elapsed seconds to TIME
   bool sec_to_time(MYSQL_TIME *ltime, uint dec) const
   {