Improve diagnostics.

btr_cur_pessimistic_update(): Add page_zip_validate() assertion.

page_zip_decompress(): Initialize all BLOB pointers.

page_zip_clear_rec(): Add page_zip_header_cmp() assertion.

page_delete_rec_list_end(): Add page_zip_validate() assertion.

dict_load_table(): Initialize table->flags with zip_size.

mlog_parse_nbytes(), mlog_parse_string(): Add parameter page_zip and
write the changes also to the compressed page if one is specified.
Assert that these functions are not called on FIL_PAGE_INDEX pages.

buf_page_io_complete(): Replace block->frame with frame where appropriate.

recv_parse_or_apply_log_rec_body(): Add ut_a(!page_zip) where appropriate.

page_parse_delete_rec_list(): Add parameter page_zip.

on page_zip->data, so that the freshly written fields will be included.

page_cur_delete_rec(): Add a page_zip_validate() assertion to the end.

page_zip_decompress(): Move the function body to page_zip_decompress_low(),
add the parameter do_validate() to enable page_validate() assertion.  Wrap
page_zip_decompress_low() with do_validate=TRUE.

page_zip_validate(): Invoke page_zip_decompress_low() with do_validate=FALSE,
as page_validate() may fail when the compressed page is being updated
in-place.

page_dir_slot_check(): Replace buf_frame_align() with ut_align_down()
in order to avoid an assertion failure in page_zip_validate(), which
will now invoke page_validate() via page_zip_decompress().

buf_page_io_complete(): On FIL_PAGE_TYPE_ZBLOB (compressed BLOB pages),
read the space_id from a different location.

page_zip_compress(), page_zip_write_rec(), page_zip_write_blob_ptr():
Replace page_simple_validate_new() with page_validate().

page_zip_clear_rec(): When running out of log space, do not attempt to
recompress the page, because the directory slots might be unbalanced and
the page_validate() assertion in page_zip_compress() would fail.
Instead, clear the BLOB pointers of the deleted record on the
uncompressed page, so that page_zip_validate() will succeed.

page_zip_validate(): Remove the comment about page_zip_clear_rec().
A mismatch always indicates a serious inconsistency.

buf_flush_init_for_writing(): On FIL_PAGE_TYPE_ZBLOB, write to
page_zip->data instead of page.

page_zip_write_rec(), page_zip_write_blob_ptr(), page_zip_write_node_ptr():
Add ut_ad(page_simple_validate_new()).

btr_rec_copy_externally_stored_field(): Add parameter zip_size.
Do not call buf_block_align(rec), because rec can also be in
dynamically allocated memory.  buf_block_align() can only be invoked
on addresses inside the buffer pool.

page_zip_clear_rec(): Improve formatting.

ut_malloc() to avoid breaking the latching order.

page_rec_check(), page_dir_slot_get_rec(): Replace buf_frame_align()
with ut_align_down() to avoid assertion failures in page_zip_validate().

btr_free_externally_stored_field(): Replace mlog_write_ulint()
with mach_write_to_4() when page_zip != NULL.  The operation is
logged by page_zip_write_blob_ptr().

by running index_merge_ror_cpk on 1-kilobyte compressed pages.

page_delete_rec_list_start(): Remove the page_zip_validate() assertion.

btr_page_split_and_insert(): Add page_zip_validate() assertions about
page and new_page after moving the records.

table in the system tablespace.

of DICT_MAX_INDEX_COL_LEN (768 bytes).

encoding any pending data.

encoding a column.

would cause the crash recovery of MLOG_COMP_PAGE_REORGANIZE to fail.
(Bug #20855)

that was found while investigating Bug #19081.

with page_zip_available() in order to avoid an extra page_zip_compress().

page_zip_available(): Make the function public.

page0zip.ic: Sort the inline function declarations in order to avoid
forward references, which do not work on some compilers.

The function will be invoked in page_zip_decompress() before setting
page_zip->m_start or page_zip->m_end.

on B-tree index pages.

page_rec_set_next(): Assert that rec != next.

rec_get_next_ptr(), rec_get_next_offs(): On compact pages, assert that
there are at least REC_N_NEW_EXTRA_BYTES + 1 between records.

page_cur_insert_rec_write_log(): Replace a buf_frame_align() call
with ut_align_offset().

page_cur_insert_rec_low(): Assert that current_rec != insert_rec.

page_zip_reorganize() was invoked.

btr_compress(): Obtain orig_pred and orig_succ after copying the records.
Add a debug assertion about FIL_PAGE_PREV.

page_copy_rec_list_end(), page_copy_rec_list_start(): Change the return
type from ibool to rec_t.  Adjust the return value after invoking
page_zip_reorganize().

uncompressed storage, to avoid bogus warnings about page number mismatch.

Replace most occurrences of #if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
with #ifdef UNIV_ZIP_DEBUG.

disable unless #ifdef UNIV_LOG_ARCHIVE.

btr_compress(): Invoke page_zip_validate() on the page being compressed.

recv_parse_or_apply_log_rec_body(): Assert that MLOG_WRITE_STRING is
never used on compressed B-tree pages.

fil_read(), fil_write(): Make these inlined functions in fil0fil.c.

fil_write_lsn_and_arch_no_to_file(): Remove the parameter space_id and
note that this function is to be called on the system tablespace, which
is uncompressed.

recv_parse_or_apply_log_rec_body(): Assert that mlog_parse_nbytes() is
never called on compressed B-tree pages.

page_zip_simple_validate(): Correct a typo in a debug assertion.

xdes_calc_descriptor_page(): Fix an incorrect debug assertion.

and obey the added flag page_zip_validate_header_only.

page_zip instead of calling fil_space_get_zip_size().  In
fil_create_new_single_table_tablespace(), the table space has not yet
been created.  Handle also FIL_PAGE_TYPE_ALLOCATED.

fil_node_open_file(): Set node->size correctly for compressed tablespaces.

fsp_header_write_space_id(): Rename to fsp_header_write_fields(),
add parameter zip_size.

fil_io(): Add UNIV_UNLIKELY hints to assertion-like tests.

one megabyte at a time, no matter what the compressed page size is.

page_zip_assertion() failure in page_copy_rec_list_end().

btr_root_raise_and_insert(), btr_lift_page_up(), btr_compress():
Add page_zip_validate() assertions.

btr_compress(): Only copy FIL_PAGE_PREV when UNIV_BTR_DEBUG is defined.

page_cur_delete_rec(): Document why the page_zip_validate() assertion
was removed.

page_copy_rec_list_end(): Remove the page_zip_validate() assertion and
document why.

page_move_rec_list_end(): Add page_zip_validate() assertion.

page_cur_delete_rec(): Do not call page_zip_validate() in the beginning,
because btr_set_min_rec_mark() in btr_cur_pessimistic_delete() will
cause a temporary mismatch.

Document temporary mismatches caused by btr_set_min_rec_mark() calls
and explain why they will not cause any problems.