MDEV-22627 Failing assertion: dict_tf2_is_valid(flags, flags2)

create_table_info_t::innobase_table_flags(): Refuse to create
a PAGE_COMPRESSED table with PAGE_COMPRESSION_LEVEL=0 if also
innodb_compression_level=0.

The parameter value innodb_compression_level=0 was only somewhat
meaningful for testing or debugging ROW_FORMAT=COMPRESSED tables.
For the page_compressed format, it never made any sense, and the
check in dict_tf_is_valid_not_redundant() that was added in
72378a25 (MDEV-12873) would cause
the server to crash.

mysql-test/suite/innodb/r/default_row_format_create,redundant.rdiff

@@ -20,3 +20,12 @@
  SET @save_format = @@GLOBAL.innodb_default_row_format;
  SET GLOBAL innodb_default_row_format = redundant;
  CREATE TABLE t1 (c1 INT) ENGINE=InnoDB;
+@@ -49,7 +49,7 @@
+ ERROR HY000: Can't create table `test`.`t` (errno: 140 "Wrong create options")
+ SHOW WARNINGS;
+ Level	Code	Message
+-Warning	1478	InnoDB: PAGE_COMPRESSED requires PAGE_COMPRESSION_LEVEL or innodb_compression_level > 0
++Warning	140	InnoDB: PAGE_COMPRESSED table can't have ROW_TYPE=REDUNDANT
+ Error	1005	Can't create table `test`.`t` (errno: 140 "Wrong create options")
+ Warning	1030	Got error 140 "Wrong create options" from storage engine InnoDB
+ CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1 page_compression_level=1;

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

@@ -42,3 +42,18 @@ SHOW TABLE STATUS LIKE 't1';
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
 t1	InnoDB	#	Redundant	#	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 DROP TABLE t1;
+SET @save_level=@@GLOBAL.innodb_compression_level;
+SET GLOBAL innodb_compression_level=0;
+CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1;
+ERROR HY000: Can't create table `test`.`t` (errno: 140 "Wrong create options")
+SHOW WARNINGS;
+Level	Code	Message
+Warning	1478	InnoDB: PAGE_COMPRESSED requires PAGE_COMPRESSION_LEVEL or innodb_compression_level > 0
+Error	1005	Can't create table `test`.`t` (errno: 140 "Wrong create options")
+Warning	1030	Got error 140 "Wrong create options" from storage engine InnoDB
+CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1 page_compression_level=1;
+DROP TABLE IF EXISTS t;
+SET GLOBAL innodb_compression_level=1;
+CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1;
+DROP TABLE IF EXISTS t;
+SET GLOBAL innodb_compression_level=@save_level;

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

@@ -44,3 +44,19 @@ TRUNCATE TABLE t1;
 --replace_column 3 # 5 # 6 # 7 # 8 # 9 # 10 # 12 #
 SHOW TABLE STATUS LIKE 't1';
 DROP TABLE t1;
+
+SET @save_level=@@GLOBAL.innodb_compression_level;
+SET GLOBAL innodb_compression_level=0;
+--error ER_CANT_CREATE_TABLE
+CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1;
+SHOW WARNINGS;
+--disable_warnings
+--error 0,ER_CANT_CREATE_TABLE
+CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1 page_compression_level=1;
+DROP TABLE IF EXISTS t;
+SET GLOBAL innodb_compression_level=1;
+--error 0,ER_CANT_CREATE_TABLE
+CREATE TABLE t(c INT) ENGINE=InnoDB page_compressed=1;
+DROP TABLE IF EXISTS t;
+--enable_warnings
+SET GLOBAL innodb_compression_level=@save_level;

storage/innobase/handler/ha_innodb.cc

@@ -11991,10 +11991,6 @@ bool create_table_info_t::innobase_table_flags()
 	modified by another thread while the table is being created. */
 	const ulint	file_format_allowed = srv_file_format;
 
-	/* Cache the value of innobase_compression_level, in case it is
-	modified by another thread while the table is being created. */
-	const ulint     default_compression_level = page_zip_level;
-
 	ha_table_option_struct *options= m_form->s->option_struct;
 
 	m_flags = 0;
@@ -12199,13 +12195,23 @@ bool create_table_info_t::innobase_table_flags()
 		m_flags2 |= DICT_TF2_USE_FILE_PER_TABLE;
 	}
 
+	ulint level = options->page_compression_level;
+	if (!level) {
+		level = page_zip_level;
+		if (!level && options->page_compressed) {
+			push_warning_printf(
+				m_thd, Sql_condition::WARN_LEVEL_WARN,
+				ER_ILLEGAL_HA_CREATE_OPTION,
+				"InnoDB: PAGE_COMPRESSED requires"
+				" PAGE_COMPRESSION_LEVEL or"
+				" innodb_compression_level > 0");
+			DBUG_RETURN(false);
+		}
+	}
+
 	/* Set the table flags */
 	dict_tf_set(&m_flags, innodb_row_format, zip_ssize,
-			m_use_data_dir,
-			options->page_compressed,
-		    	options->page_compression_level == 0 ?
-		        default_compression_level : static_cast<ulint>(options->page_compression_level),
-		    	0);
+		    m_use_data_dir, options->page_compressed, level, 0);
 
 	/* Set the flags2 when create table or alter tables */
 	m_flags2 |= DICT_TF2_FTS_AUX_HEX_NAME;