MDEV-18625 ASAN unknown-crash in my_copy_fix_mb /...

MDEV-18625 ASAN unknown-crash in my_copy_fix_mb / ha_mroonga::storage_inplace_alter_table_add_column

disable inplace alter for adding stored generated columns.

This fixes mroonga/storage.column_generated_stored_add_column failures
in ASAN_OPTIONS="abort_on_error=1" runs

Also, add a test case that shows the bug without ASAN.

storage/mroonga/ha_mroonga.cpp

@@ -14525,6 +14525,7 @@ enum_alter_inplace_result ha_mroonga::wrapper_check_if_supported_inplace_alter(
         Alter_inplace_info::ALTER_COLUMN_NULLABLE |
         Alter_inplace_info::ALTER_COLUMN_NOT_NULLABLE |
         Alter_inplace_info::ALTER_COLUMN_STORAGE_TYPE |
+        Alter_inplace_info::ADD_STORED_GENERATED_COLUMN |
         Alter_inplace_info::ALTER_COLUMN_COLUMN_FORMAT
       )
     )
@@ -14643,7 +14644,6 @@ enum_alter_inplace_result ha_mroonga::storage_check_if_supported_inplace_alter(
     Alter_inplace_info::DROP_UNIQUE_INDEX |
     MRN_ALTER_INPLACE_INFO_ADD_VIRTUAL_COLUMN |
     MRN_ALTER_INPLACE_INFO_ADD_STORED_BASE_COLUMN |
-    MRN_ALTER_INPLACE_INFO_ADD_STORED_GENERATED_COLUMN |
     Alter_inplace_info::DROP_COLUMN |
     Alter_inplace_info::ALTER_COLUMN_NAME;
   if (ha_alter_info->handler_flags & explicitly_unsupported_flags) {

storage/mroonga/mysql-test/mroonga/storage/r/column_generated_stored_add_column.result

-DROP TABLE IF EXISTS logs;
+set names utf8mb4;
 CREATE TABLE logs (
 id INT,
 record JSON
 ) ENGINE=Mroonga DEFAULT CHARSET=utf8mb4;
 INSERT INTO logs(id, record) VALUES (1, '{"level": "info", "message": "start"}');
+INSERT INTO logs(id, record) VALUES (1, json_object('message', repeat('☹', 253)));
 ALTER TABLE logs ADD COLUMN message VARCHAR(255) GENERATED ALWAYS AS (json_extract(`record`, '$.message')) STORED;
 ALTER TABLE logs ADD FULLTEXT INDEX(message) comment 'tokenizer "TokenBigramSplitSymbolAlphaDigit"';
 INSERT INTO logs(id, record) VALUES (2, '{"level": "info", "message": "restart"}');

storage/mroonga/mysql-test/mroonga/storage/t/column_generated_stored_add_column.test

@@ -18,9 +18,7 @@
 --source ../../include/mroonga/skip_mariadb_10_1_or_earlier.inc
 --source ../../include/mroonga/have_mroonga.inc
 
---disable_warnings
-DROP TABLE IF EXISTS logs;
---enable_warnings
+set names utf8mb4;
 
 CREATE TABLE logs (
   id INT,
@@ -28,6 +26,7 @@ CREATE TABLE logs (
 ) ENGINE=Mroonga DEFAULT CHARSET=utf8mb4;
 
 INSERT INTO logs(id, record) VALUES (1, '{"level": "info", "message": "start"}');
+INSERT INTO logs(id, record) VALUES (1, json_object('message', repeat('☹', 253)));
 
 ALTER TABLE logs ADD COLUMN message VARCHAR(255) GENERATED ALWAYS AS (json_extract(`record`, '$.message')) STORED;
 ALTER TABLE logs ADD FULLTEXT INDEX(message) comment 'tokenizer "TokenBigramSplitSymbolAlphaDigit"';