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Fix nbtree page split rmgr desc routine.

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Include newitemoff in rmgr desc output for nbtree page split records.
In passing, correct an obsolete comment that claimed that newitemoff is
only logged for _L variant nbtree page split WAL records.

Both issues were oversights in commit 2c03216d831, which revamped the
WAL format.

Author: Peter Geoghegan
Backpatch: 9.5-, where the WAL format was revamped.
This commit is contained in:
Peter Geoghegan 2019-09-12 15:45:03 -07:00
parent b54cff2bf3
commit 09b236af90
2 changed files with 8 additions and 8 deletions
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4
src/backend/access/rmgrdesc/nbtdesc.c
View File

@ -40,8 +40,8 @@ btree_desc(StringInfo buf, XLogReaderState *record)
{
xl_btree_split *xlrec = (xl_btree_split *) rec;
appendStringInfo(buf, "level %u, firstright %d",
xlrec->level, xlrec->firstright);
appendStringInfo(buf, "level %u, firstright %d, newitemoff %d",
xlrec->level, xlrec->firstright, xlrec->newitemoff);
break;
}
case XLOG_BTREE_VACUUM:

12
src/include/access/nbtxlog.h
View File

@ -78,11 +78,11 @@ typedef struct xl_btree_insert
*
* Note: the four XLOG_BTREE_SPLIT xl_info codes all use this data record.
* The _L and _R variants indicate whether the inserted tuple went into the
* left or right split page (and thus, whether newitemoff and the new item
* are stored or not). The _ROOT variants indicate that we are splitting
* the root page, and thus that a newroot record rather than an insert or
* split record should follow. Note that a split record never carries a
* metapage update --- we'll do that in the parent-level update.
* left or right split page (and thus, whether the new item is stored or not).
* The _ROOT variants indicate that we are splitting the root page, and thus
* that a newroot record rather than an insert or split record should follow.
* Note that a split record never carries a metapage update --- we'll do that
* in the parent-level update.
*
* Backup Blk 0: original page / new left page
*
@ -104,7 +104,7 @@ typedef struct xl_btree_split
{
uint32 level; /* tree level of page being split */
OffsetNumber firstright; /* first item moved to right page */
OffsetNumber newitemoff; /* new item's offset (if placed on left page) */
OffsetNumber newitemoff; /* new item's offset (useful for _L variants) */
} xl_btree_split;
#define SizeOfBtreeSplit (offsetof(xl_btree_split, newitemoff) + sizeof(OffsetNumber))