Marko Mäkelä ff3d4395d8 MDEV-30882 Crash on ROLLBACK in a ROW_FORMAT=COMPRESSED table ... row_upd_rec_in_place(): Avoid calling page_zip_write_rec() if we are not modifying any fields that are stored in compressed format. btr_cur_update_in_place_zip_check(): New function to check if a ROW_FORMAT=COMPRESSED record can actually be updated in place. btr_cur_pessimistic_update(): If the BTR_KEEP_POS_FLAG is not set (we are in a ROLLBACK and cannot write any BLOBs), ignore the potential overflow and let page_zip_reorganize() or page_zip_compress() handle it. This avoids a failure when an attempted UPDATE of an NULL column to 0 is rolled back. During the ROLLBACK, we would try to move a non-updated long column to off-page storage in order to avoid a compression failure of the ROW_FORMAT=COMPRESSED page. page_zip_write_trx_id_and_roll_ptr(): Remove an assertion that would fail in row_upd_rec_in_place() because the uncompressed page would already have been modified there. Thanks to Jean-François Gagné for providing a copy of a page that triggered these bugs on the ROLLBACK of UPDATE and DELETE. A 10.6 version of this was tested by Matthias Leich using cmake -DWITH_INNODB_EXTRA_DEBUG=ON a.k.a. UNIV_ZIP_DEBUG.		2023-03-22 14:31:00 +02:00
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page0cur.cc	Merge 10.3 into 10.4	2021-08-25 07:30:47 +03:00
page0page.cc	Merge 10.3 into 10.4	2021-04-14 10:33:59 +03:00
page0zip.cc	MDEV-30882 Crash on ROLLBACK in a ROW_FORMAT=COMPRESSED table	2023-03-22 14:31:00 +02:00