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This is a backport of commitfd9ca2a742
(MDEV-23295) and commit9a156e1a23
(MDEV-23345) to 10.3. An instant ADD/DROP/reorder column could create a dummy table object with the wrong ROW_FORMAT when innodb_default_row_format was changed between CREATE TABLE and ALTER TABLE. prepare_inplace_alter_table_dict(): If we had promised that ALGORITHM=INPLACE is supported, we must preserve the ROW_FORMAT. The rest of the changes are related to adding Alter_inplace_info::inplace_supported to cache the return value of handler::check_if_supported_inplace_alter().