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MDEV-30984 Online ALTER table is denied with non-informative error me…
…ssages Group all the checks in online_alter_check_supported(). There is now two groups of checks: 1. A technical availability of online, that is checked before open_tables, and affects table_list->lock_type. It's supposed to be safe to make it TL_READ even if COPY algorithm will fall back to not-online, since MDL is SHARED_UPGRADEABLE anyway. 2. An 'online' availability for a COPY algorithm. It can be done as late as just before the copy_data_between_tables call. The lock_type influence is disclosed above, so the only other place it affects is Alter_info::supports_lock, where `online` flag is only used to decide whether to report the error at the inplace preparation stage. We'd want to make that at the last resort, which is COPY preparation, if no algorithm is chosen by the user. So it's event better now. Some changes are required to the autoinc support detection, as the check now happens after mysql_prepare_alter_table: * alter_info->drop_list is empty * instead, dropped columns are in tmp_set * alter_info->create_list now has every field that's in the new table. * the column definition's change.str will be nonnull whether the column remains in the new table (vs whether it was changed, as before). But it also has `field` field set. * IF EXISTS doesn't have to be dealt anymore This infers that the changes are now checked in more detail: a field's definition shouldn't be changed, vs a field shouldn't be mentioned in the CHANGE list, as it was before. This is reflected by the line 193 test.
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