Import and adjust a test from MySQL 5.7.

mysql-test/suite/innodb/r/log_alter_table.result

+#
+# Bug#21801423 INNODB REDO LOG DOES NOT INDICATE WHEN
+# FILES ARE CREATED
+#
+# Bug#21796691 INNODB REDO LOG DOES NOT INDICATE WHEN
+# REDO LOGGING IS SKIPPED
+#
+CREATE TABLE t1 (a INT NOT NULL, b INT UNIQUE) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1,2);
+ALTER TABLE t1 ADD PRIMARY KEY(a), ALGORITHM=INPLACE;
+ALTER TABLE t1 DROP INDEX b, ADD INDEX (b);
+# Kill the server
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;

mysql-test/suite/innodb/t/log_alter_table.test

+--source include/have_innodb.inc
+--source include/have_debug.inc
+
+# Embedded server does not support crashing
+--source include/not_embedded.inc
+
+--echo #
+--echo # Bug#21801423 INNODB REDO LOG DOES NOT INDICATE WHEN
+--echo # FILES ARE CREATED
+--echo #
+--echo # Bug#21796691 INNODB REDO LOG DOES NOT INDICATE WHEN
+--echo # REDO LOGGING IS SKIPPED
+--echo #
+--source include/no_checkpoint_start.inc
+CREATE TABLE t1 (a INT NOT NULL, b INT UNIQUE) ENGINE=InnoDB;
+# MLOG_INDEX_LOAD will not be emitted for empty tables. Insert a row.
+INSERT INTO t1 VALUES (1,2);
+# We should get two MLOG_INDEX_LOAD for this.
+ALTER TABLE t1 ADD PRIMARY KEY(a), ALGORITHM=INPLACE;
+# And one MLOG_INDEX_LOAD for this.
+ALTER TABLE t1 DROP INDEX b, ADD INDEX (b);
+
+--let CLEANUP_IF_CHECKPOINT=DROP TABLE t1;
+--source include/no_checkpoint_end.inc
+
+--let $restart_parameters= --debug=d,ib_log
+--source include/start_mysqld.inc
+
+let SEARCH_RANGE = -50000;
+let SEARCH_FILE = $MYSQLTEST_VARDIR/log/mysqld.1.err;
+let SEARCH_ABORT=NOT FOUND;
+# Look for at least one MLOG_FILE_CREATE2 in the error log.
+# Theoretically, it may have been written by this test or an earlier test.
+# FIXME: redirect the error log of the restart to a new file,
+# and ensure that we have exactly 2 records there.
+let SEARCH_PATTERN=scan .*: multi-log rec MLOG_FILE_CREATE2.*page .*:0;
+--source include/search_pattern_in_file.inc
+# Look for at least one MLOG_INDEX_LOAD in the error log.
+# Theoretically, it may have been written by this test or an earlier test.
+# FIXME: redirect the error log of the restart to a new file,
+# and ensure that we have exactly 3 records there.
+let SEARCH_PATTERN=scan .*: log rec MLOG_INDEX_LOAD;
+--source include/search_pattern_in_file.inc
+
+CHECK TABLE t1;
+
+# Remove the --debug=d,ib_log setting.
+--let $restart_parameters=
+--source include/restart_mysqld.inc
+
+DROP TABLE t1;