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Amit Kapila 5509055d69 Add sequence synchronization for logical replication. ... This patch introduces sequence synchronization. Sequences that are synced will have 2 states: - INIT (needs [re]synchronizing) - READY (is already synchronized) A new sequencesync worker is launched as needed to synchronize sequences. A single sequencesync worker is responsible for synchronizing all sequences. It begins by retrieving the list of sequences that are flagged for synchronization, i.e., those in the INIT state. These sequences are then processed in batches, allowing multiple entries to be synchronized within a single transaction. The worker fetches the current sequence values and page LSNs from the remote publisher, updates the corresponding sequences on the local subscriber, and finally marks each sequence as READY upon successful synchronization. Sequence synchronization occurs in 3 places: 1) CREATE SUBSCRIPTION - The command syntax remains unchanged. - The subscriber retrieves sequences associated with publications. - Published sequences are added to pg_subscription_rel with INIT state. - Initiate the sequencesync worker to synchronize all sequences. 2) ALTER SUBSCRIPTION ... REFRESH PUBLICATION - The command syntax remains unchanged. - Dropped published sequences are removed from pg_subscription_rel. - Newly published sequences are added to pg_subscription_rel with INIT state. - Initiate the sequencesync worker to synchronize only newly added sequences. 3) ALTER SUBSCRIPTION ... REFRESH SEQUENCES - A new command introduced for PG19 by f0b3573c3a. - All sequences in pg_subscription_rel are reset to INIT state. - Initiate the sequencesync worker to synchronize all sequences. - Unlike "ALTER SUBSCRIPTION ... REFRESH PUBLICATION" command, addition and removal of missing sequences will not be done in this case. Author: Vignesh C <vignesh21@gmail.com> Reviewed-by: shveta malik <shveta.malik@gmail.com> Reviewed-by: Hou Zhijie <houzj.fnst@fujitsu.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com> Reviewed-by: Peter Smith <smithpb2250@gmail.com> Reviewed-by: Nisha Moond <nisha.moond412@gmail.com> Reviewed-by: Shlok Kyal <shlok.kyal.oss@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/CAA4eK1LC+KJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ@mail.gmail.com		2 months ago
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conflict.h	Don't include execnodes.h in replication/conflict.h	3 months ago
decode.h	Update copyright for 2025	1 year ago
logical.h	Update copyright for 2025	1 year ago
logicallauncher.h	Preserve conflict-relevant data during logical replication.	5 months ago
logicalproto.h	Change publication's publish_generated_columns option type to enum.	11 months ago
logicalrelation.h	Update copyright for 2025	1 year ago
logicalworker.h	Add sequence synchronization for logical replication.	2 months ago
message.h	Update copyright for 2025	1 year ago
origin.h	Remove pg_replication_origin's TOAST table.	8 months ago
output_plugin.h	Update copyright for 2025	1 year ago
pgoutput.h	Update copyright for 2025	1 year ago
reorderbuffer.h	Add mem_exceeded_count column to pg_stat_replication_slots.	3 months ago
slot.h	Make invalid primary_slot_name follow standard GUC error reporting.	2 months ago
slotsync.h	pg_noreturn to replace pg_attribute_noreturn()	10 months ago
snapbuild.h	Update copyright for 2025	1 year ago
snapbuild_internal.h	pg_logicalinspect: Fix possible crash when passing a directory path.	10 months ago
syncrep.h	Allow redeclaration of typedef yyscan_t	4 months ago
walreceiver.h	Add WalRcvGetState() to retrieve the state of a WAL receiver	2 months ago
walsender.h	Update copyright for 2025	1 year ago
walsender_private.h	Allow redeclaration of typedef yyscan_t	4 months ago
worker_internal.h	Add sequence synchronization for logical replication.	2 months ago