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().
btr_cur_pessimistic_update(): Remove extraneous page_zip_write_rec() call.
btr_cur_set_ownership_of_extern_field(): Simplify the logic.
row_upd_rec_in_place(): Make use of parameter "index" in debug assertions.
page_zip_write_rec(): Remove TODO comment about redo log record.
The write will already be covered by higher-level log entries.
of clustered indexes. Previously, parts of the code assumed that these
columns would exist on all leaf pages. Simplify the update-in-place of
these columns.
Add inline function dict_index_is_clust() to replace all tests
index->type & DICT_CLUSTERED.
Remove the redo log entry types MLOG_ZIP_WRITE_TRX_ID and
MLOG_ZIP_WRITE_ROLL_PTR, because the modifications to these columns
are covered by logical logging.
Fuse page_zip_write_trx_id() and page_zip_write_roll_ptr() into
page_zip_write_trx_id_and_roll_ptr().
page_zip_dir_add_slot(), page_zip_available(): Add flag "is_clustered",
so that no space will be reserved for TRX_ID and ROLL_PTR on leaf pages
of secondary indexes.
page_zip_apply_log(): Flag an error when val==0 is encoded with two bytes.
page_zip_write_rec(): Add debug assertions that there is enough space
available for the entry before copying the data bytes of the record.
row_upd_rec_in_place(), page_zip_write_rec(): Add parameter "index".
page_dir_set_n_heap(): Add a debug assertion that on compressed
pages, n_heap will always be incremented by one. Improve code formatting.
page_zip_dir_add_slot(): New function, called from
page_cur_insert_rec_low() after page_mem_alloc_heap().
rec_set_n_owned_new(): Do not call page_zip_rec_set_owned()
on the supremum record.
rec_offs_make_valid(): Add debug assertions.
page_zip_dir_user_size(): Correct an off-by-one error in the debug assertion.
page_zip_apply_log(): Add parameter trx_id_col. Skip trx_id and roll_ptr.
page_zip_decompress(): Simplify the handling of "storage" in the loop that
copies the uncompressed fields.
page_zip_write_rec(): Store trx_id and roll_ptr separately.
page_zip_write_trx_id(), page_zip_write_roll_ptr(): Fix off-by-one errors.
page_cur_insert_rec_low(): Call page_zip_dir_add_slot() after
page_mem_alloc_heap(). Remove some redundant assertions.
Pass page_zip to page_dir_split_slot().
BLOB pointers, trx_id, and roll_ptr.
btr_empty(), btr_create(), page_create(): Add parameter "index", as some
index information will be encoded on the compressed page.
Define REC_NODE_PTR_SIZE as 4.
Allow btr_page_reorganize() and btr_page_reorganize_low() to fail.
Define the error code DB_ZIP_OVERFLOW.
Make row_ins_index_entry_low() static.
page0zip: Encode the index, log reorganized records, and store uncompressed
fields separately from the compressed data stream.
