Make tablesample work with partitioned tables.

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

2 files changed, 26 insertions, 0 deletions

diff --git a/src/test/regress/expected/tablesample.out b/src/test/regress/expected/tablesample.out
index 7e91b958aea..b18e420e9b5 100644
--- a/src/test/regress/expected/tablesample.out
+++ b/src/test/regress/expected/tablesample.out
@@ -313,3 +313,21 @@ SELECT q.* FROM (SELECT * FROM test_tablesample) as q TABLESAMPLE BERNOULLI (5);
 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;
diff --git a/src/test/regress/sql/tablesample.sql b/src/test/regress/sql/tablesample.sql
index eec97934966..c39fe4b7509 100644
--- a/src/test/regress/sql/tablesample.sql
+++ b/src/test/regress/sql/tablesample.sql
@@ -100,3 +100,11 @@ WITH query_select AS (SELECT * FROM test_tablesample)
 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;