MDEV-15243 Crash with virtual fields and row based binary logging

The cause of this was several different bugs:

- When using binary logging with binlog_row_image=FULL
  the all bits in read_set was set, which caused a
  different (wrong) pattern for marking vcol_set.
- TABLE::mark_virtual_columns_for_write() didn't in all
  cases mark vcol_set with the vcol_field.
- TABLE::update_virtual_fields() has to update all
  vcol fields on REPLACE if binary logging with FULL
  is used.
- VCOL_UPDATE_INDEXED should update all vcol fields part
  of an index that was not updated by VCOL_UPDATE_FOR_READ
- max_row_length() calculated length of NULL and not
  used fields. This didn't cause any crash, but used
  more memory than needed.

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

@@ -0,0 +1,70 @@
+include/master-slave.inc
+[connection master]
+CREATE TABLE t1 (
+pk SERIAL,
+vcol_date DATE AS (col_date) PERSISTENT,
+vcol_int INT AS (col_int) VIRTUAL,
+vcol_year YEAR AS (col_year) PERSISTENT,
+vcol_blob BLOB AS (col_blob) VIRTUAL,
+col_date DATE,
+col_int INT NULL,
+col_blob BLOB NULL,
+col_year YEAR,
+PRIMARY KEY(pk)
+) ENGINE=InnoDB;
+INSERT INTO t1 (col_date,col_int,col_blob,col_year) VALUES ('2010-04-24',5,'foo',1981);
+SET SQL_MODE='';
+set binlog_row_image="FULL";
+CREATE VIEW v1 AS SELECT * FROM t1;
+REPLACE INTO v1 SELECT pk, vcol_date, vcol_int, vcol_year, vcol_blob, col_date, col_int, col_blob, 1982 FROM t1;
+Warnings:
+Warning	1906	The value specified for generated column 'vcol_date' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_int' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_year' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_blob' in table 't1' ignored
+select col_date,col_int,col_blob,col_year from v1;
+col_date	col_int	col_blob	col_year
+2010-04-24	5	foo	1982
+connection slave;
+select col_date,col_int,col_blob,col_year from v1;
+col_date	col_int	col_blob	col_year
+2010-04-24	5	foo	1982
+connection master;
+DROP VIEW v1;
+set binlog_row_image="MINIMAL";
+CREATE VIEW v1 AS SELECT * FROM t1;
+REPLACE INTO v1 SELECT pk, vcol_date, vcol_int, vcol_year, vcol_blob, col_date, col_int, col_blob, 1983 FROM t1;
+Warnings:
+Warning	1906	The value specified for generated column 'vcol_date' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_int' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_year' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_blob' in table 't1' ignored
+select col_date,col_int,col_blob,col_year from v1;
+col_date	col_int	col_blob	col_year
+2010-04-24	5	foo	1983
+connection slave;
+select col_date,col_int,col_blob,col_year from v1;
+col_date	col_int	col_blob	col_year
+2010-04-24	5	foo	1983
+connection master;
+DROP VIEW v1;
+set @@binlog_row_image="NOBLOB";
+CREATE VIEW v1 AS SELECT * FROM t1;
+REPLACE INTO v1 SELECT pk, vcol_date, vcol_int, vcol_year, vcol_blob, col_date, col_int, col_blob, 1984 FROM t1;
+Warnings:
+Warning	1906	The value specified for generated column 'vcol_date' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_int' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_year' in table 't1' ignored
+Warning	1906	The value specified for generated column 'vcol_blob' in table 't1' ignored
+select col_date,col_int,col_blob,col_year from v1;
+col_date	col_int	col_blob	col_year
+2010-04-24	5	foo	1984
+connection slave;
+select col_date,col_int,col_blob,col_year from v1;
+col_date	col_int	col_blob	col_year
+2010-04-24	5	foo	1984
+connection master;
+DROP VIEW v1;
+set @@binlog_row_image=default;
+DROP TABLE t1;
+include/rpl_end.inc

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

@@ -9,8 +9,20 @@ a	b	c
 2	3	4
 drop table t1;
 create table t1 (a int, c int as(a), p varchar(20) as(y), y char(20), index (p,c));
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) DEFAULT NULL,
+  `c` int(11) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  `p` varchar(20) GENERATED ALWAYS AS (`y`) VIRTUAL,
+  `y` char(20) DEFAULT NULL,
+  KEY `p` (`p`,`c`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
 insert into t1 (a,y) values(1, "yyy");
 update t1 set a = 100 where a = 1;
+check table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
 drop table t1;
 create table t1 (
 a varchar(10000),