"next BLOB page" pointer, write it also to the compressed page,
which is the one that will be flushed to disk.

unexpected end of compressed BLOB.

reporting and handling of inflate() errors.

always convert back big_rec_vec.

was accidentally omitted in r766.

of externally stored columns to 108 bytes when possible.

This will unmask a bug in the handling of BLOBs on compressed tablespaces,
especially of small page sizes.  Apparently, the locally stored part must
be less than 235 bytes in size for the bug to occur.

dict_col_struct: Add field min_prefix.

dict_index_build_internal_non_clust(): Adjust min_prefix.

dtuple_convert_big_rec().  This should never happen, though.

as per revisions r763:765.

old value of PAGE_N_RECS.

page_zip_dir_find_free_low(): Rename to page_zip_dir_find_low().

page_zip_dir_find(): Make use of page_zip_dir_find_low().

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.