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Commitca90252

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Reintroduce support for sequences in pgstattuple and pageinspect.
Commit4b82664 restricted a number of functions provided bycontrib modules to only relations that use the "heap" table accessmethod. Sequences always use this table access method, but they donot advertise as such in the pg_class system catalog, so theaforementioned commit also (presumably unintentionally) removedsupport for sequences from some of these functions. This commitreintroduces said support for sequences to these functions and addsa couple of relevant tests.Co-authored-by: Ayush VatsaReviewed-by: Robert Haas, Michael Paquier, Matthias van de MeentDiscussion:https://postgr.es/m/CACX%2BKaP3i%2Bi9tdPLjF5JCHVv93xobEdcd_eB%2B638VDvZ3i%3DcQA%40mail.gmail.comBackpatch-through: 12
1 parentabed06f commitca90252

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6 files changed

+60
-2
lines changed

6 files changed

+60
-2
lines changed

‎contrib/pageinspect/expected/page.out

Lines changed: 9 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -232,3 +232,12 @@ SELECT page_checksum(decode(repeat('00', :block_size), 'hex'), 1);
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(1 row)
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235+
-- tests for sequences
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create temporary sequence test_sequence;
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select tuple_data_split('test_sequence'::regclass, t_data, t_infomask, t_infomask2, t_bits)
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from heap_page_items(get_raw_page('test_sequence', 0));
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tuple_data_split
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-------------------------------------------------------
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{"\\x0100000000000000","\\x0000000000000000","\\x00"}
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(1 row)
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‎contrib/pageinspect/heapfuncs.c

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -318,7 +318,11 @@ tuple_data_split_internal(Oid relid, char *tupdata,
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raw_attrs=initArrayResult(BYTEAOID,CurrentMemoryContext, false);
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nattrs=tupdesc->natts;
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321-
if (rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
321+
/*
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* Sequences always use heap AM, but they don't show that in the catalogs.
323+
*/
324+
if (rel->rd_rel->relkind!=RELKIND_SEQUENCE&&
325+
rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
322326
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
323327
errmsg("only heap AM is supported")));
324328

‎contrib/pageinspect/sql/page.sql

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -95,3 +95,8 @@ SHOW block_size \gset
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SELECT fsm_page_contents(decode(repeat('00', :block_size),'hex'));
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SELECT page_header(decode(repeat('00', :block_size),'hex'));
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SELECT page_checksum(decode(repeat('00', :block_size),'hex'),1);
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99+
-- tests for sequences
100+
create temporary sequence test_sequence;
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select tuple_data_split('test_sequence'::regclass, t_data, t_infomask, t_infomask2, t_bits)
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from heap_page_items(get_raw_page('test_sequence',0));

‎contrib/pgstattuple/expected/pgstattuple.out

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -244,6 +244,30 @@ select pgstathashindex('test_partition_hash_idx');
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(4,8,0,1,0,0,0,100)
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(1 row)
246246

247+
-- these should work for sequences
248+
create sequence test_sequence;
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select count(*) from pgstattuple('test_sequence');
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count
251+
-------
252+
1
253+
(1 row)
254+
255+
select pg_relpages('test_sequence');
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pg_relpages
257+
-------------
258+
1
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(1 row)
260+
261+
-- these should fail for sequences
262+
select pgstatindex('test_sequence');
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ERROR: relation "test_sequence" is not a btree index
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select pgstatginindex('test_sequence');
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ERROR: relation "test_sequence" is not a GIN index
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select pgstathashindex('test_sequence');
267+
ERROR: relation "test_sequence" is not a hash index
268+
select pgstattuple_approx('test_sequence');
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ERROR: "test_sequence" is not a table or materialized view
270+
drop sequence test_sequence;
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drop table test_partitioned;
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drop view test_view;
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drop foreign table test_foreign_table;

‎contrib/pgstattuple/pgstattuple.c

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -335,7 +335,11 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
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pgstattuple_typestat= {0};
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SnapshotDataSnapshotDirty;
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338-
if (rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
338+
/*
339+
* Sequences always use heap AM, but they don't show that in the catalogs.
340+
*/
341+
if (rel->rd_rel->relkind!=RELKIND_SEQUENCE&&
342+
rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
339343
ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
341345
errmsg("only heap AM is supported")));

‎contrib/pgstattuple/sql/pgstattuple.sql

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -114,6 +114,18 @@ create index test_partition_hash_idx on test_partition using hash (a);
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select pgstatindex('test_partition_idx');
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select pgstathashindex('test_partition_hash_idx');
116116

117+
-- these should work for sequences
118+
createsequencetest_sequence;
119+
selectcount(*)from pgstattuple('test_sequence');
120+
select pg_relpages('test_sequence');
121+
122+
-- these should fail for sequences
123+
select pgstatindex('test_sequence');
124+
select pgstatginindex('test_sequence');
125+
select pgstathashindex('test_sequence');
126+
select pgstattuple_approx('test_sequence');
127+
128+
dropsequence test_sequence;
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droptable test_partitioned;
118130
dropview test_view;
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drop foreign table test_foreign_table;

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