MDEV-11527 Virtual columns do not get along well with NO_ZERO_DATE

don't check defaults for vcols

mysql-test/suite/vcol/r/vcol_misc.result

@@ -330,3 +330,10 @@ t1	CREATE TABLE `t1` (
   `c1` varchar(50) COLLATE latin1_general_ci DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci
 drop table t1;
+set sql_mode='no_zero_date';
+create table t1 (
+ts timestamp not null default current_timestamp,
+tsv timestamp as (adddate(ts, interval 1 day)) virtual
+);
+drop table t1;
+set sql_mode=default;

mysql-test/suite/vcol/t/vcol_misc.test

@@ -290,3 +290,14 @@ create table t1 (a int, b int as (b is null) virtual);
 create table t1 (v1 varchar(255) as (c1) persistent, c1 varchar(50)) collate=latin1_general_ci;
 show create table t1;
 drop table t1;
+
+#
+# MDEV-11527 Virtual columns do not get along well with NO_ZERO_DATE
+#
+set sql_mode='no_zero_date';
+create table t1 (
+  ts timestamp not null default current_timestamp,
+  tsv timestamp as (adddate(ts, interval 1 day)) virtual
+);
+drop table t1;
+set sql_mode=default;

sql/sql_table.cc

@@ -3826,7 +3826,7 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
     Field::utype type= (Field::utype) MTYP_TYPENR(sql_field->unireg_check);
 
     if (thd->variables.sql_mode & MODE_NO_ZERO_DATE &&
-        !sql_field->def &&
+        !sql_field->def && !sql_field->vcol_info &&
         sql_field->sql_type == MYSQL_TYPE_TIMESTAMP &&
         (sql_field->flags & NOT_NULL_FLAG) &&
         (type == Field::NONE || type == Field::TIMESTAMP_UN_FIELD))