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Thomas Munro f003d9f872 Add circular WAL decoding buffer. ... Teach xlogreader.c to decode its output into a circular buffer, to support optimizations based on looking ahead. * XLogReadRecord() works as before, consuming records one by one, and allowing them to be examined via the traditional XLogRecGetXXX() macros. * An alternative new interface XLogNextRecord() is added that returns pointers to DecodedXLogRecord structs that can be examined directly. * XLogReadAhead() provides a second cursor that lets you see further ahead, as long as data is available and there is enough space in the decoding buffer. This returns DecodedXLogRecord pointers to the caller, but also adds them to a queue of records that will later be consumed by XLogNextRecord()/XLogReadRecord(). The buffer's size is controlled with wal_decode_buffer_size. The buffer could potentially be placed into shared memory, for future projects. Large records that don't fit in the circular buffer are called "oversized" and allocated separately with palloc(). Discussion: https://postgr.es/m/CA+hUKGJ4VJN8ttxScUFM8dOKX0BrBiboo5uz1cq=AovOddfHpA@mail.gmail.com		5 years ago
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amapi.h	Pass down "logically unchanged index" hint.	5 years ago
amvalidate.h	Update copyright for 2021	5 years ago
attmap.h	Update copyright for 2021	5 years ago
attnum.h	Update copyright for 2021	5 years ago
brin.h	Update copyright for 2021	5 years ago
brin_internal.h	Move IS [NOT] NULL handling from BRIN support functions	5 years ago
brin_page.h	Update copyright for 2021	5 years ago
brin_pageops.h	Update copyright for 2021	5 years ago
brin_revmap.h	Update copyright for 2021	5 years ago
brin_tuple.h	BRIN minmax-multi indexes	5 years ago
brin_xlog.h	Update copyright for 2021	5 years ago
bufmask.h	Update copyright for 2021	5 years ago
clog.h	Remove unused function prototypes.	5 years ago
commit_ts.h	Remove unused function prototypes.	5 years ago
detoast.h	Allow configurable LZ4 TOAST compression.	5 years ago
genam.h	Simplify state managed by VACUUM.	5 years ago
generic_xlog.h	Update copyright for 2021	5 years ago
gin.h	Update copyright for 2021	5 years ago
gin_private.h	Pass down "logically unchanged index" hint.	5 years ago
ginblock.h	Update copyright for 2021	5 years ago
ginxlog.h	Update copyright for 2021	5 years ago
gist.h	C comments: improve description of GiST NSN and GistBuildLSN	5 years ago
gist_private.h	Pass down "logically unchanged index" hint.	5 years ago
gistscan.h	Update copyright for 2021	5 years ago
gistxlog.h	Update copyright for 2021	5 years ago
hash.h	Pass down "logically unchanged index" hint.	5 years ago
hash_xlog.h	Update copyright for 2021	5 years ago
heapam.h	Remove tupgone special case from vacuumlazy.c.	5 years ago
heapam_xlog.h	Remove tupgone special case from vacuumlazy.c.	5 years ago
heaptoast.h	Update copyright for 2021	5 years ago
hio.h	Update copyright for 2021	5 years ago
htup.h	Update copyright for 2021	5 years ago
htup_details.h	Rework HeapTupleHeader macros to reuse itemptr.h	5 years ago
itup.h	Support INCLUDE'd columns in SP-GiST.	5 years ago
multixact.h	Remove unused function prototypes.	5 years ago
nbtree.h	Recycle nbtree pages deleted during same VACUUM.	5 years ago
nbtxlog.h	Don't consider newly inserted tuples in nbtree VACUUM.	5 years ago
parallel.h	Update copyright for 2021	5 years ago
printsimple.h	Update copyright for 2021	5 years ago
printtup.h	Update copyright for 2021	5 years ago
relation.h	Update copyright for 2021	5 years ago
reloptions.h	Update copyright for 2021	5 years ago
relscan.h	Adjust design of per-worker parallel seqscan data struct	5 years ago
rewriteheap.h	Update copyright for 2021	5 years ago
rmgr.h	Phase 2 of pgindent updates.	9 years ago
rmgrlist.h	Update copyright for 2021	5 years ago
sdir.h	Update copyright for 2021	5 years ago
session.h	Update copyright for 2021	5 years ago
skey.h	Update copyright for 2021	5 years ago
slru.h	Prevent excess SimpleLruTruncate() deletion.	5 years ago
spgist.h	Pass down "logically unchanged index" hint.	5 years ago
spgist_private.h	Support INCLUDE'd columns in SP-GiST.	5 years ago
spgxlog.h	Update copyright for 2021	5 years ago
stratnum.h	Update copyright for 2021	5 years ago
subtrans.h	Remove unused function prototypes.	5 years ago
syncscan.h	Update copyright for 2021	5 years ago
sysattr.h	Update copyright for 2021	5 years ago
table.h	Update copyright for 2021	5 years ago
tableam.h	Simplify state managed by VACUUM.	5 years ago
timeline.h	Update copyright for 2021	5 years ago
toast_compression.h	Tidy up more loose ends related to configurable TOAST compression.	5 years ago
toast_helper.h	Allow configurable LZ4 TOAST compression.	5 years ago
toast_internals.h	Short-circuit slice requests that are for more than the object's size.	5 years ago
transam.h	BRIN minmax-multi indexes	5 years ago
tsmapi.h	Update copyright for 2021	5 years ago
tupconvert.h	Fix permission checks on constraint violation errors on partitions.	5 years ago
tupdesc.h	Update copyright for 2021	5 years ago
tupdesc_details.h	Update copyright for 2021	5 years ago
tupmacs.h	Update copyright for 2021	5 years ago
twophase.h	Update copyright for 2021	5 years ago
twophase_rmgr.h	Update copyright for 2021	5 years ago
valid.h	Update copyright for 2021	5 years ago
visibilitymap.h	Update copyright for 2021	5 years ago
xact.h	Revert "Enable parallel SELECT for "INSERT INTO ... SELECT ..."."	5 years ago
xlog.h	Code review for server's handling of "tablespace map" files.	5 years ago
xlog_internal.h	Remove tupgone special case from vacuumlazy.c.	5 years ago
xlogarchive.h	Update copyright for 2021	5 years ago
xlogdefs.h	Simplify printing of LSNs	5 years ago
xloginsert.h	Update copyright for 2021	5 years ago
xlogreader.h	Add circular WAL decoding buffer.	5 years ago
xlogrecord.h	Update copyright for 2021	5 years ago
xlogutils.h	Remove read_page callback from XLogReader.	5 years ago