MDEV-19695 Import tablespace doesn't work with ROW_FORMAT=COMPRESSED encrypted tablespace

Problem:
=======
fil_iterate() writes imported tablespace page0 as it is to discarded
tablespace. Space id wasn't even changed. While opening the tablespace,
tablespace fails with space id mismatch error.

Fix:
====
fil_iterate() copies the page0 with discarded space id to imported
tablespace.

2 files changed, 49 insertions, 0 deletions

diff --git a/mysql-test/suite/encryption/t/compressed_import_tablespace.opt b/mysql-test/suite/encryption/t/compressed_import_tablespace.opt
new file mode 100644
index 00000000000..a9893ed4b29
--- /dev/null
+++ b/mysql-test/suite/encryption/t/compressed_import_tablespace.opt
@@ -0,0 +1,3 @@
+--innodb-encrypt-tables=ON
+--innodb-encryption-threads=4
+--innodb-tablespaces-encryption
diff --git a/mysql-test/suite/encryption/t/compressed_import_tablespace.test b/mysql-test/suite/encryption/t/compressed_import_tablespace.test
new file mode 100644
index 00000000000..b9e4913584b
--- /dev/null
+++ b/mysql-test/suite/encryption/t/compressed_import_tablespace.test
@@ -0,0 +1,46 @@
+-- source include/have_innodb.inc
+-- source include/have_example_key_management_plugin.inc
+-- source include/not_valgrind.inc
+-- source include/not_embedded.inc
+
+let MYSQLD_DATADIR = `SELECT @@datadir`;
+--let t1_IBD = $MYSQLD_DATADIR/test/t1.ibd
+CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY, a VARCHAR(255)) ENGINE=InnoDB ROW_FORMAT=COMPRESSED ENCRYPTED=YES;
+INSERT INTO t1 VALUES(1, repeat('Nesamani', 10));
+
+SELECT COUNT(*) FROM t1;
+SHOW CREATE TABLE t1;
+
+--echo # Wait max 10 min for key encryption threads to encrypt all spaces
+--let $wait_timeout= 600
+--let $wait_condition=SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0 AND ROTATING_OR_FLUSHING <> 0
+--source include/wait_condition.inc
+
+--source include/shutdown_mysqld.inc
+
+--source include/start_mysqld.inc
+let MYSQLD_DATADIR =`SELECT @@datadir`;
+
+--list_files $MYSQLD_DATADIR/test
+FLUSH TABLES t1 FOR EXPORT;
+perl;
+do "$ENV{MTR_SUITE_DIR}/include/innodb-util.pl";
+ib_backup_tablespaces("test", "t1");
+EOF
+--list_files $MYSQLD_DATADIR/test
+UNLOCK TABLES;
+DROP TABLE t1;
+
+CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY, a VARCHAR(255)) ENGINE=InnoDB ROW_FORMAT=COMPRESSED ENCRYPTED=YES;
+ALTER TABLE t1 DISCARD TABLESPACE;
+perl;
+do "$ENV{MTR_SUITE_DIR}/include/innodb-util.pl";
+ib_discard_tablespaces("test", "t1");
+ib_restore_tablespaces("test", "t1");
+EOF
+
+ALTER TABLE t1 IMPORT TABLESPACE;
+
+SELECT COUNT(*) FROM t1;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;