Replace the parameter "dict_index_t* index" with "ibool is_clust".

dict_index_is_clust(): Add __attribute__((pure)).

page_cur_insert_rec_zip_reorg(): New function: Recompress or
reorganize a compressed page.

page_cur_insert_rec_zip(): New function: insert a record to
a compressed page.

page_cur_insert_rec_low(): Only handle inserts to uncompressed pages.

with rec_t** current_rec.  Reposition *current_rec after calling
page_zip_reorganize().

from the adaptive hash index [btr_search_guess_on_hash() and
btr_search_validate()].  Some references to buf_block_align() remain
in debug builds.

btr_store_big_rec_extern_fields(): Add the parameter rec_block.

page_rec_get_next_low(): Do not assume that the page has been
allocated from the buffer pool when printing the diagnostic information.

page_cur_insert_rec_low(): Replace the parameter page_zip_des_t* page_zip
with the parameter buf_block_t* block.

page_set_max_trx_id(): Replace page_t* parameter with buf_block_t*,
to avoid a buf_block_align() call.

Replace some occurrences of page_get_page_no() with buf_block_get_page_no().

page_cur_delete_rec(): Replace buf_block_align() with page_cur_get_block().

btr_cur_t: Move page_block to page_cur_t::block.

page_cur_get_block(), page_cur_get_page_zip(): New functions.

page_cur_position(): Add parameter block.

Remove many page_zip parameters, now that there is page_cur_get_page_zip().
Replace some page, page_zip parameters with block.

Add some const qualifiers to function parameters and remove casts.

PAGE_HEAP_NO_INFIMUM, PAGE_HEAP_NO_SUPREMUM, PAGE_HEAP_NO_USER_LOW:
New constants.

Replace some cursor code in low-level diagnostic functions with
direct management of rec, because buf_block_t::buf_fix_count may be 0
when the functions are called, and debug assertions would fail.

Replace page_t* or page_zip_des_t* parameters in some functions with
buf_block_t*.

buf_frame_get_page_zip(): Disable unless #ifdef UNIV_DEBUG || UNIV_ZIP_DEBUG.

btr_cur_t: Add buf_block_t* page_block.

btr_pcur_get_block(), btr_cur_get_block(), btr_cur_get_page_zip():
New functions.

btr_cur_position(): Add the parameter block.

Replace buf_frame_modify_clock_inc() with buf_block_modify_clock_inc().
Replace buf_frame_get_lock_hash_val() with buf_block_get_lock_hash_val().
Replace buf_frame_get_lock_mutex() with buf_block_get_lock_mutex().

page_create_zip(), page_create(), page_create_low(), btr_page_free(),
btr_page_free_low(): Replace page_t with buf_block_t.

ut_align_down(), or ut_align_offset().

of externally stored columns, and fix bugs introduced in r873.  (Bug #22496)

btr_page_get_sure_split_rec(), btr_page_insert_fits(),
rec_get_converted_size(), rec_convert_dtuple_to_rec(),
rec_convert_dtuple_to_rec_old(), rec_convert_dtuple_to_rec_new():
Add parameters ext and n_ext.  Flag external fields during the
conversion.

rec_set_field_extern_bits(), rec_set_field_extern_bits_new(),
rec_offs_set_nth_extern(), rec_set_nth_field_extern_bit_old():
Remove.  The bits are set by rec_convert_dtuple_to_rec().

page_cur_insert_rec_low(): Remove the parameters ext and n_ext.

btr_cur_add_ext(): New utility function for updating and sorting ext[].
Low-level functions now expect the array to be in ascending order
for performance reasons.  Used in btr_cur_optimistic_insert(),
btr_cur_pessimistic_insert(), and btr_cur_pessimistic_update().

btr_cur_optimistic_insert(): Remove some defensive code, because we cannot
compute the added parameters of rec_get_converted_size().

btr_push_update_extern_fields(): Sort the array.  Require the array to
be twice the maximum usage, so that ut_ulint_sort() can be used.

dtuple_convert_big_rec(): Allocate new space for the BLOB pointer,
to avoid overwriting prefix indexes to the same column.  Adapt
dtuple_convert_back_big_rec().

row_build_index_entry(): Fetch the columns also for prefix indexes of
the clustered index.

page_zip_apply_log(), page_zip_decompress_clust(): Allow externally
stored fields to lack a locally stored part.

on the ZIP_DUMMY index.  Because it does not contain valid collation
information, the ordering check in page_validate() may fail on pages
containing non-binary data.

Instead, let the callers of page_zip_decompress() invoke page_validate()
when the index information is available.

as per revisions r763:765.

with page_zip_dir_insert().  Pass page_zip to rec_set_n_owned_new()
and page_dir_slot_set_n_owned().

page_zip_dir_insert(): New function.  Shift the dense page directory and
write the inserted record there.

data0data.c: Add #include "page0zip.h" that was forgotten from r739.

page_cur_insert_rec_low(): Remove a memory leak when preventing
extra_size to grow.

the record will fit on an empty compressed page.

buf_block_alloc(), buf_block_free(), buf_frame_alloc(), buf_frame_free():
Make inlined.

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.

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.

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.

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

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.

ut_a(page_zip_validate()) that are enabled if UNIV_DEBUG or
UNIV_ZIP_DEBUG is defined.

page_zip_compress_write_log(): Make static.

page_zip_compress(): Add optional parameter mtr for redo logging.

page_zip_reorganize(): Low-level counterpart of btr_page_reorganize().

page_zip_copy(): Add debug assertions about mtr_memo_contains.

page_cur_insert_rec_low(): Try page_zip_reorganize() and seek to the
new position of insert_rec if it succeeds.

page_copy_rec_list_end(), page_copy_rec_list_start():
Try page_zip_reorganize().

page_move_rec_list_end(): Remove bogus comment.

page_zip_copy(), page_zip_compress_write_log(): Add parameter 'index'.

page_zip_parse_write_header(): Check for !page_zip only if page != NULL.

page_zip_compress_write_log(), page_zip_parse_compress(): Omit some
fields in the page header.  Omit the unused bytes between the modification
log and the page trailer.

parse_or_apply_log_rec_body(): Remove a bogus debug assertion.

buf_page_print(): Print also compressed pages.  Add parameter zip_size.

buf_flush_init_for_writing(): Stamp the fields on a compressed B-tree index
page.

Add the header field FIL_PAGE_ZBLOB_SPACE_ID as an alias of FIL_PAGE_PREV.

page_zip_calc_checksum(): New function.

page_zip_compress(): Avoid copying the fields that are written in
buf_flush_init_for_writing().

page_zip_header_cmp(): New function for comparing those fields of the
page header that will not be written in buf_flush_init_for_writing().

recompressing the page.

buf_flush_init_for_writing(): Calculate the checksum with the actual zip_size.

buf_calc_zblob_page_checksum(): Skip the field FIL_PAGE_SPACE_OR_CHKSUM.

trx_sys_doublewrite_init_or_restore_page(): Use the actual zip_size.

page_cur_insert_rec_low(): If page_zip_alloc() fails, try compressing the
whole page afterwards.

btr_page_reorganize_low(): Rename new_page to temp_page.

btr_store_big_rec_extern_fields(): FIL_PAGE_TYPE is 2 bytes, not 4.

buf_page_init(), buf_page_create(), buf_read_page_low(),
buf_page_init_for_read(): Add parameter zip_size.

buf_page_init_for_backup_restore(),
recv_apply_log_recs_for_backup(): Enclose in #ifdef UNIV_HOTBACKUP.

Enclose some debug code in #ifdef UNIV_LOG_REPLICATE.

page_zip_write_header_log(): Replace page_zip with a pointer to
the uncompressed page.

page_zip_write_rec(): Relax an assertion about blob_no + n_ext.

page_copy_rec_list_to_created_page_write_log(): Allow logging to be disabled.

page_zip_alloc(): Add parameter "mtr" and log successful calls
to page_zip_compress().

page_zip_write_blob_ptr(), page_zip_write_node_ptr(): Write the offset on
the uncompressed page, because mlog_write_initial_log_record_fast()
does not do so.

page_zip_write_header_log(), page_zip_parse_write_header(): Encode the
offset in one byte.

MLOG_ZIP_LIST_START_COPY and MLOG_ZIP_LIST_END_COPY.

btr_compress(): Simplify a debug assertion.

page_zip_compress_write_log(), page_zip_parse_compress(): New functions.

page_cur_parse_insert_rec(): Simplify the code.

page_parse_create_zip(): Removed.

page_create_zip(), page_copy_rec_list_end(),
page_copy_rec_list_start(): Invoke page_zip_compress_write_log().

MLOG_ZIP_COMPRESS and MLOG_ZIP_DECOMPRESS with higher-level entry types.
Implement the logging and crash recovery of MLOG_ZIP_PAGE_CREATE.

page_create_zip(): New function for creating a compressed B-tree page.

page_parse_create_zip(): New function for applying a MLOG_ZIP_PAGE_CREATE
redo log record.

btr_page_create(): Remove the prototype.  Add parameters page_zip, level,
prev, and next.

btr0btr.c: Eliminate page_zip_compress() calls where possible.

page_zip_alloc(), page_zip_compress(), page_zip_decompress(),
page_zip_clear_rec(): Remove parameter mtr.

recv_parse_or_apply_log_rec_body(): Handle MLOG_ZIP_PAGE_CREATE.
Add TODO comments for the other added redo log entry types.

page_cur_search_with_match(): Add a page_zip_validate() debug assertion.

page_validate(): Add a missing space to a fprintf() format string.

operations on BLOB columns.  There are some bugs in the code, because
test-insert and a few other tests fail.

page_mem_free(): Add parameter index.  Decrement PAGE_N_RECS here.
Move some operations to page_zip_dir_delete().

page_zip_clear_rec(): Make this a static function.

page_zip_dir_delete(): Add parameters index and offsets.
Decrement PAGE_N_RECS and clear info_bits and n_owned.

page_zip_get_n_prev_extern(): Correct the synopsis and the algorithm.
Add parameter page_zip.  Search the records in heap_no order instead
of collation order.

page_zip_compress(), page_zip_decompress(): Only copy BLOB pointers
and increment n_blobs for records that have not been deleted.

page_zip_clear_rec(): Clear trx_id and roll_ptr on the compressed page.

page_zip_dir_delete(): Decrement PAGE_N_RECS.  Shift the array of
BLOB pointers.  Call page_zip_clear_rec().

page_zip_dir_add_slot(): Shift the array of BLOB pointers to make
space of roll_ptr and trx_id.

page_cur_delete_rec(): Do not decrement PAGE_N_RECS or call
page_zip_clear_rec(), as page_mem_free() already does it.

page_zip_dir_delete() will need to handle BLOBs.

rec_set_field_extern_bits(), rec_set_field_extern_bits_new():
Add parameter offsets.

rec_offs_set_nth_extern(): New function to set an extern bit in offsets.
This will be called when an extern bit is set in a record.

page_cur_rec_insert(), page_cur_insert_rec_low(): Document that the
parameter "offsets" is in/out.

page_zip_dir_delete(): Note that the array of BLOB pointers will need
to be shifted.

page0zip.ic: Document the entry type for clearing a record.

page_zip_available(): Add parameter "index".  Remove parameters
"is_leaf" and "is_clustered".

page_zip_get_trailer_len(): New function for computing the trailer length
of the compressed page.

page_zip_apply_log(): Implement the modification log entry type for
clearing the data bytes of a record.

page_zip_decompress(): Initialize n_blobs when actually copying the
BLOB pointers to place.

page_zip_validate(): Add diagnostic messages for failures.  Check
also m_start, m_end, and n_blobs.

page_zip_write_blob_ptr(): Add page_zip_validate() assertion.

There are still some bugs in the code.

btr_store_big_rec_extern_fields(): Remove assertion on dict_table_is_zip()
to ease testing.

btr_free_externally_stored_field(): Test page_zip instead of
dict_table_is_zip().

page_zip_write_rec(): Add parameter "create".  Try to handle externally
stored columns.

rec_offs_any_extern(): Correct the function comment.

Add rec_offs_n_extern() and page_zip_get_n_prev_extern().

page_zip_dir_decode(): Replace assertion with if (...) return(FALSE).

page_zip_decompress(): Do not clear page_zip->n_blobs after counting the
BLOBs.

page_zip_write_blob_ptr(): Use page_zip_get_n_prev_extern().
Correct an off-by-one error in memcpy().