MDEV-32589 FULL_NODUP mode for binlog_row_image

This patch provides a new mode FULL_NODUP to binlog_row_image system
variable. With FULL_NODUP mode, all columns are included in before
image, but only updated columns are included in after image for UPDATE.
While all columns are included in the after image for INSERT.

FULL_NODUP is for replacing FULL mode. It includes all data of
the before and after image as FULL mode, but it uses less storage
especially in the case that only a few columns are updated.

Note: It will binlog full before and after image for all modes if the
      table has no primary key. FULL_NODUP follows the behavior.

mysql-test/main/mysqld--help.result

@@ -122,15 +122,17 @@ The following specify which files/extra groups are read (specified before remain
  size if possible. The value has to be a multiple of 256.
  --binlog-row-image=name 
  Controls whether rows should be logged in 'FULL',
- 'NOBLOB' or 'MINIMAL' formats. 'FULL', means that all
- columns in the before and after image are logged.
- 'NOBLOB', means that mysqld avoids logging blob columns
- whenever possible (eg, blob column was not changed or is
- not part of primary key). 'MINIMAL', means that a PK
- equivalent (PK columns or full row if there is no PK in
- the table) is logged in the before image, and only
- changed columns are logged in the after image. (Default:
- FULL).
+ 'FULL_NODUP', 'NOBLOB' or 'MINIMAL' formats. 'FULL',
+ means that all columns in the before and after image are
+ logged. 'FULL_NODUP', means that all columns are logged
+ in before image, but only changed columns or all columns
+ of inserted record are logged in after image, 'NOBLOB',
+ means that mysqld avoids logging blob columns whenever
+ possible (eg, blob column was not changed or is not part
+ of primary key). 'MINIMAL', means that a PK equivalent
+ (PK columns or full row if there is no PK in the table)
+ is logged in the before image, and only changed columns
+ are logged in the after image. (Default: FULL).
  --binlog-row-metadata=name 
  Controls whether metadata is logged using FULL , MINIMAL
  format and NO_LOG.FULL causes all metadata to be logged;

mysql-test/suite/binlog/include/row_img.test

@@ -0,0 +1,56 @@
+# Auxaliary script for test binlog_row_image
+#
+CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 varchar(100),
+                 c3 INT DEFAULT 1000, c4 TEXT);
+CREATE TABLE t2 (c1 INT, c2 char(100), c3 INT DEFAULT 1000, c4 TEXT);
+
+FLUSH BINARY LOGS;
+--let $binlog= query_get_value(SHOW MASTER STATUS, File, 1)
+--let $datadir= `SELECT @@datadir`
+
+--let $img_mode= `SELECT @@binlog_row_image`
+--echo
+--echo #########################################################################
+--echo # binlog_row_image = $img_mode
+--echo #########################################################################
+--echo
+INSERT INTO t1 VALUES(1, "insert_to_t1", 1, repeat('a', 20)),
+                     (2, "insert_to_t1", 2, repeat('a', 20)),
+                     (3, "insert_to_t1", 3, repeat('a', 20));
+INSERT INTO t1(c1) VALUES(4);
+UPDATE t1 SET c2 = "only_c2_changed";
+UPDATE t1 SET c3 = 1, c4 = "c3_c4_changed";
+DELETE FROM t1 WHERE c1 = 1;
+
+--echo
+--echo # Verify that rows events are binlogged as expeced.
+--echo
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+--replace_regex /^\# at .*// /.*SET (@@|TIMESTAMP).*// /.* end_log_pos .*// /xid=\d*/xid=<xid>/
+--exec $MYSQL_BINLOG --force-if-open --verbose --verbose --base64-output=DECODE-ROWS $datadir/$binlog
+
+FLUSH BINARY LOGS;
+--let $binlog= query_get_value(SHOW MASTER STATUS, File, 1)
+--let $datadir= `SELECT @@datadir`
+
+--echo
+--echo # t2 has no primary key.
+--echo # It will binlog full before and after image for all modes if the
+--echo # table has no primary key. FULL_NODUP follows the behavior.
+--echo
+INSERT INTO t2 VALUES(1, "insert_to_t2", 1, repeat('a', 20)),
+                     (2, "insert_to_t2", 2, repeat('a', 20)),
+                     (3, "insert_to_t2", 3, repeat('a', 20));
+INSERT INTO t2(c1) VALUES(4);
+UPDATE t2 SET c2 = "only_c2_changed";
+UPDATE t2 SET c3 = 1, c4 = "c3_c4_changed";
+DELETE FROM t2 WHERE c1 > 2;
+
+--echo
+--echo # Verify that rows events are binlogged as expeced.
+--echo
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+--replace_regex /^\# at .*// /.*SET (@@|TIMESTAMP).*// /.* end_log_pos .*// /xid=\d*/xid=<xid>/
+--exec $MYSQL_BINLOG --force-if-open --verbose --verbose --base64-output=DECODE-ROWS $datadir/$binlog
+
+DROP TABLE t1, t2;