if rw_latch == RW_NO_LATCH.

Determine zip_size in kilobytes, pass on in bytes.

stored columns.

page_zip_decompress(): We indeed need to clear the BLOB pointers of deleted
records twice.  This implies that we also need to invoke rec_get_offsets()
twice for each record on a leaf page.  Add clarifying comments.

page_zip_clear_rec(): Add the flag page_zip_clear_rec_disable for
disabling the clearing of deleted records.

page_zip_compress_write_log(): Do not invoke page_zip_validate(), since
this is a static function and the callers already invoke page_zip_validate().

page_zip_decompress_low(): Clear the page #ifdef UNIV_ZIP_DEBUG.
Optimizations: Remove local variable "last".  Do not clear the BLOB
pointer until the modification log has been applied.  (Since r690,
it will be cleared after applying the modification log.)
Avoid calling rec_get_offsets() a second time if there are no
uncompressed columns to be restored.

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.