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MDEV-17138 follow-up: Optimize index page creation
btr_create(), btr_root_raise_and_insert(): Write a MLOG_MEMSET record to set FIL_PAGE_PREV,FIL_PAGE_NEXT to FIL_NULL, instead of writing two MLOG_4BYTES records. For ROW_FORMAT=COMPRESSED pages, we will not use MLOG_MEMSET because we want the crash-downgrade to earlier 10.4 releases to succeed. mlog_parse_nbytes(): Relax the too strict assertion. There is no problem with MLOG_MEMSET records that affect the uncompressed header of ROW_FORMAT=COMPRESSED index pages.
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