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Commit05036a3

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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 parentb0c3061 commit05036a3

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6 files changed

+61
-2
lines changed

6 files changed

+61
-2
lines changed

‎contrib/pageinspect/expected/page.out

Lines changed: 9 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -239,3 +239,12 @@ SELECT page_checksum(decode(repeat('00', :block_size), 'hex'), 1);
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(1 row)
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242+
-- tests for sequences
243+
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
@@ -320,7 +320,11 @@ 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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323-
if (rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
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/*
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* Sequences always use heap AM, but they don't show that in the catalogs.
325+
*/
326+
if (rel->rd_rel->relkind!=RELKIND_SEQUENCE&&
327+
rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
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ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
325329
errmsg("only heap AM is supported")));
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‎contrib/pageinspect/sql/page.sql

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -98,3 +98,8 @@ 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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-- tests for sequences
103+
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: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -273,6 +273,31 @@ select pgstathashindex('test_partition_hash_idx');
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(4,8,0,1,0,0,0,100)
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(1 row)
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276+
-- these should work for sequences
277+
create sequence test_sequence;
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select count(*) from pgstattuple('test_sequence');
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count
280+
-------
281+
1
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(1 row)
283+
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select pg_relpages('test_sequence');
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pg_relpages
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-------------
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1
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(1 row)
289+
290+
-- these should fail for sequences
291+
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');
296+
ERROR: relation "test_sequence" is not a hash index
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select pgstattuple_approx('test_sequence');
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ERROR: relation "test_sequence" is of wrong relation kind
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DETAIL: This operation is not supported for sequences.
300+
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
@@ -323,7 +323,11 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
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pgstattuple_typestat= {0};
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SnapshotDataSnapshotDirty;
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326-
if (rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
326+
/*
327+
* Sequences always use heap AM, but they don't show that in the catalogs.
328+
*/
329+
if (rel->rd_rel->relkind!=RELKIND_SEQUENCE&&
330+
rel->rd_rel->relam!=HEAP_TABLE_AM_OID)
327331
ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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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
@@ -119,6 +119,18 @@ create index test_partition_hash_idx on test_partition using hash (a);
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select pgstatindex('test_partition_idx');
120120
select pgstathashindex('test_partition_hash_idx');
121121

122+
-- these should work for sequences
123+
createsequencetest_sequence;
124+
selectcount(*)from pgstattuple('test_sequence');
125+
select pg_relpages('test_sequence');
126+
127+
-- these should fail for sequences
128+
select pgstatindex('test_sequence');
129+
select pgstatginindex('test_sequence');
130+
select pgstathashindex('test_sequence');
131+
select pgstattuple_approx('test_sequence');
132+
133+
dropsequence test_sequence;
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droptable test_partitioned;
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dropview test_view;
124136
drop foreign table test_foreign_table;

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