of non-clustered indexes.  On these pages, only the bytes rec[-5..-1]
will be omitted from the compressed data stream.  Save time by not looking
for trx_id or externally stored columns.

externally stored columns.  Make some use of the fact in compression and
decompression.

rec_init_offsets(): Add ut_ad(dict_index_is_clust(index)) before flagging
external columns.

page_zip_get_trailer_len(): Assert ut_ad(!page_zip->n_blobs) unless
dict_index_is_clust(index).

page_zip_get_n_prev_extern(): Add ut_ad(dict_index_is_clust(index)).

page_zip_compress(), page_zip_decompress_low(): Add dict_index_is_clust()
assertions.  Allow completely external storage of columns.  Simplify
the computation of "externs".

page_zip_write_rec(): Store leaf node records of non-clustered indexes
with one memcpy(), avoiding rec_offs_n_extern() and the for loop.

page_zip_write_blob_ptr(): Add ut_ad(dict_index_is_clust(index)).
Simplify the computation of "externs".

page_zip_clear_rec(): Only attempt to zero out BLOB pointers when
the record belongs to a leaf page of a clustered index.

page_zip_dir_delete(): Take a fast path when the record is
not on a leaf page of a clustered index.
Simplify the computation of "externs".

page_zip_copy(): Assert that n_blobs is zero on anything else than
leaf pages of clustered indexes.

if and only if the records on the page contain a trx_id column.
(Dummy indexes of non-leaf pages will always show up as non-clustered.)

referencing it, to prevent a ut_ad() assertion on page_zip_get_trailer_len()
from failing.  Promote that assertion to ut_a().

of secondary indexes.  (This is just an optimization; the logic in the
search loop would never store such records externally.)

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.

according to InnoDB formatting rules.

record will fit or need external storage.

btr_page_get_sure_split_rec(): Estimate the free space of an empty
compressed page.

page_zip_rec_needs_ext(): New function, to replace existing tests whether
external storage is needed.

struct mtr_struct: Omit unused field "state" unless #ifdef UNIV_DEBUG.

buf_block_buf_fix_inc_debug(): Remove redundant __attribute__((unused))
and #ifdef UNIV_SYNC_DEBUG.

print functions.

buf_LRU_print(), buf_print(): Replace #ifdef UNIV_DEBUG
with #ifdef UNIV_DEBUG_PRINT.

will compile with inlining disabled.

page0page.h: Add #include "page0zip.h"

page_dir_slot_get_rec(): Avoid void* arithmetics.

trx0undo.ic, trx0sys.ic: Remove unnecessary #include "page0zip.h"

page_zip_write_header(): Move prototype from page0types.h to page0zip.h

"old_end" with "ret".  Otherwise, a page_zip_reorganize() would make
lock_move_rec_list_start() fail.

initial decompression, in case the record will be deleted and the
space will be reused by a smaller record.

page_zip_clear_rec_disable: Note the possibility of a page_zip_validate()
failure when the space of a deleted record is reused by a smaller record.

buf_LRU_get_free_block(): When zip_size changes, initialize all fields
of page_zip.  This avoids an assertion failure in page_create_zip() when
a block with an originally larger zip_size is reallocated.

fsp_get_space_header(): Assert that the stored space id matches.

xdes_get_state(): Assert that the state is valid.

MLOG_COMP_REC_MIN_MARK is allowed on a compressed page.

row_upd_sec_index_entry(): Remove redundant goto.  Replace duplicated
cleanup code with goto func_exit.

mtr_memo_slot_release(): Eliminate the #else branch of #ifdef UNIV_DEBUG
by reorganizing the code.

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.