This was an oversight in the original partitioning commit.
Amit Langote, reviewed by David Fetter
Discussion: http://postgr.es/m/
59af6590-8ace-04c4-c36c-
ea35d435c60e@lab.ntt.co.jp
rte = rt_fetch(rtr->rtindex, pstate->p_rtable);
/* We only support this on plain relations and matviews */
if (rte->relkind != RELKIND_RELATION &&
- rte->relkind != RELKIND_MATVIEW)
+ rte->relkind != RELKIND_MATVIEW &&
+ rte->relkind != RELKIND_PARTITIONED_TABLE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("TABLESAMPLE clause can only be applied to tables and materialized views"),
ERROR: syntax error at or near "TABLESAMPLE"
LINE 1: ...CT q.* FROM (SELECT * FROM test_tablesample) as q TABLESAMPL...
^
+-- check partitioned tables support tablesample
+create table parted_sample (a int) partition by list (a);
+create table parted_sample_1 partition of parted_sample for values in (1);
+create table parted_sample_2 partition of parted_sample for values in (2);
+explain (costs off)
+ select * from parted_sample tablesample bernoulli (100);
+ QUERY PLAN
+-------------------------------------------
+ Append
+ -> Sample Scan on parted_sample
+ Sampling: bernoulli ('100'::real)
+ -> Sample Scan on parted_sample_1
+ Sampling: bernoulli ('100'::real)
+ -> Sample Scan on parted_sample_2
+ Sampling: bernoulli ('100'::real)
+(7 rows)
+
+drop table parted_sample, parted_sample_1, parted_sample_2;
SELECT * FROM query_select TABLESAMPLE BERNOULLI (5.5) REPEATABLE (1);
SELECT q.* FROM (SELECT * FROM test_tablesample) as q TABLESAMPLE BERNOULLI (5);
+
+-- check partitioned tables support tablesample
+create table parted_sample (a int) partition by list (a);
+create table parted_sample_1 partition of parted_sample for values in (1);
+create table parted_sample_2 partition of parted_sample for values in (2);
+explain (costs off)
+ select * from parted_sample tablesample bernoulli (100);
+drop table parted_sample, parted_sample_1, parted_sample_2;