Inserting a record into an index page involves updating multiple
fields in the page header as well as updating the next-record links
and potentially updating fields related to the sparse page directory.
Let us cover the insert operations by higher-level log records, to avoid
'redundant' logging about the writes.
The code for applying the high-level log records will check the
consistency of the page thoroughly, to avoid crashes during recovery.
We will refuse to replay the inserts if any inconsistency is detected.
With innodb_force_recovery=1, recovery will continue, but the affected
pages may be more inconsistent if some changes were omitted.
mrec_ext_t: Introduce the EXTENDED record subtypes
INSERT_HEAP_REDUNDANT, INSERT_REUSE_REDUNDANT,
INSERT_HEAP_DYNAMIC, INSERT_REUSE_DYNAMIC.
The record will explicitly identify the page type and whether
the space will be allocated from PAGE_HEAP_TOP or reused from
the PAGE_FREE list. It will also tell how many bytes to copy
from the preceding record header and payload, and how to
initialize the rest of the record header and payload.
mtr_t::page_insert(): Write the high-level log records.
log_phys_t::apply(): Parse the high-level log records.
page_apply_insert_redundant(), page_apply_insert_dynamic():
Apply the high-level log records.
page_dir_split_slot(): Introduce a variant that does not write log
nor deal with ROW_FORMAT=COMPRESSED pages.
page_mem_alloc_heap(): Remove the mtr_t parameter
page_cur_insert_rec_low(): Write log only via mtr_t::page_insert().
This is a follow-up to commit 572d20757be38157fa2309c35efdec19e68087f1
where we introduced the EXTENDED log record subtypes
DELETE_ROW_FORMAT_REDUNDANT and DELETE_ROW_FORMAT_DYNAMIC.
log_phys_t::apply(): If corruption was noticed, stop applying the log
unless innodb_force_recovery is set.
This is a follow-up to commit 84e3f9ce84c3e7fce70142cff4bea1c8b916810b
that introduced the EXTENDED log record of UNDO_APPEND subtype.
mtr_t::undo_append(): Accurately enforce the mtr_buf_t::MAX_DATA_SIZE
limit. Also, replace mtr_buf_t::push() with simpler code, to append 1 byte
to the log.
log_phys_t::undo_append(): Return whether the page was found to
be in an inconsistent state.
log_phys_t::apply(): If corruption was noticed, stop applying log
unless innodb_force_recovery is set.
