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robertmhaasrobertmhaas
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Add pg_visibility contrib module.
This lets you examine the visibility map as well as page-level visibility information. I initially wrote it as a debugging aid, but was encouraged to polish it for commit. Patch by me, reviewed by Masahiko Sawada. Discussion: 56D77803.6080503@BlueTreble.com
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‎contrib/Makefile

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@@ -37,6 +37,7 @@ SUBDIRS = \
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pgcrypto \
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pgrowlocks \
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pgstattuple \
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pg_visibility \
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postgres_fdw \
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seg \
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spi \

‎contrib/pg_visibility/Makefile

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# contrib/pg_visibility/Makefile
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MODULE_big = pg_visibility
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OBJS = pg_visibility.o $(WIN32RES)
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EXTENSION = pg_visibility
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DATA = pg_visibility--1.0.sql
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PGFILEDESC = "pg_visibility - page visibility information"
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ifdef USE_PGXS
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PG_CONFIG = pg_config
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PGXS := $(shell $(PG_CONFIG) --pgxs)
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include $(PGXS)
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else
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subdir = contrib/pg_visibility
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top_builddir = ../..
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include $(top_builddir)/src/Makefile.global
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include $(top_srcdir)/contrib/contrib-global.mk
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endif

‎contrib/pg_visibility/pg_visibility--1.0.sql

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/* contrib/pg_visibility/pg_visibility--1.0.sql */
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION pg_visibility" to load this file. \quit
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-- Show visibility map information.
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CREATE FUNCTION pg_visibility_map(regclass, blkno bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean)
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RETURNS record
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AS 'MODULE_PATHNAME', 'pg_visibility_map'
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LANGUAGE C STRICT;
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-- Show visibility map and page-level visibility information.
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CREATE FUNCTION pg_visibility(regclass, blkno bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean,
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pd_all_visible OUT boolean)
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RETURNS record
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AS 'MODULE_PATHNAME', 'pg_visibility'
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LANGUAGE C STRICT;
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-- Show visibility map information for each block in a relation.
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CREATE FUNCTION pg_visibility_map(regclass, blkno OUT bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean)
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RETURNS SETOF record
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AS 'MODULE_PATHNAME', 'pg_visibility_map_rel'
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LANGUAGE C STRICT;
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-- Show visibility map and page-level visibility information for each block.
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CREATE FUNCTION pg_visibility(regclass, blkno OUT bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean,
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pd_all_visible OUT boolean)
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RETURNS SETOF record
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AS 'MODULE_PATHNAME', 'pg_visibility_rel'
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LANGUAGE C STRICT;
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-- Show summary of visibility map bits for a relation.
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CREATE FUNCTION pg_visibility_map_summary(regclass,
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OUT all_visible bigint, OUT all_frozen bigint)
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RETURNS record
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AS 'MODULE_PATHNAME', 'pg_visibility_map_summary'
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LANGUAGE C STRICT;
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-- Don't want these to be available to public.
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REVOKE ALL ON FUNCTION pg_visibility_map(regclass, bigint) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility(regclass, bigint) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility_map(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility_map_summary(regclass) FROM PUBLIC;

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