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pg_visibility: Add pg_truncate_visibility_map function.

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This requires some core changes as well so that we can properly
WAL-log the truncation.  Specifically, it changes the format of the
XLOG_SMGR_TRUNCATE WAL record, so bump XLOG_PAGE_MAGIC.

Patch by me, reviewed but not fully endorsed by Andres Freund.
This commit is contained in:
Robert Haas
2016-06-17 17:37:30 -04:00
parent 54f5c5150f
commit 71d05a2c7b
8 changed files with 133 additions and 13 deletions
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3
src/backend/access/rmgrdesc/smgrdesc.c
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@@ -37,7 +37,8 @@ smgr_desc(StringInfo buf, XLogReaderState *record)
xl_smgr_truncate *xlrec = (xl_smgr_truncate *) rec;
char *path = relpathperm(xlrec->rnode, MAIN_FORKNUM);
appendStringInfo(buf, "%s to %u blocks", path, xlrec->blkno);
appendStringInfo(buf, "%s to %u blocks flags %d", path,
xlrec->blkno, xlrec->flags);
pfree(path);
}
}