Fix selectivity estimation @> (anymultirange, anyrange) operator

Attempt to get selectivity estimation for @> (anymultirange, anyrange) operator
caused an error in buildfarm, because this operator was missed in switch()
of calc_hist_selectivity().  Fix that and also make regression tests reliably
check that selectivity estimation for (multi)ranges doesn't fall.  Previously,
whether we test selectivity estimation for (multi)ranges depended on
whether autovacuum managed to gather concurrently to the test.

Reported-by: Michael Paquier
Discussion: https://postgr.es/m/X%2BwmgjRItuvHNBeV%40paquier.xyz

src/backend/utils/adt/multirangetypes_selfuncs.c

@@ -649,6 +649,7 @@ calc_hist_selectivity(TypeCacheEntry *typcache, VariableStatData *vardata,
 
 		case OID_MULTIRANGE_RANGE_CONTAINED_OP:
 		case OID_MULTIRANGE_MULTIRANGE_CONTAINED_OP:
+		case OID_RANGE_MULTIRANGE_CONTAINED_OP:
 			if (const_lower.infinite)
 			{
 				/*

src/test/regress/expected/multirangetypes.out

@@ -2227,6 +2227,11 @@ insert into test_multirange_gist select int4multirange(int4range(g, g+10000)) fr
 insert into test_multirange_gist select int4multirange(int4range(NULL, g*10, '(]'), int4range(g*10, g*20, '(]')) from generate_series(1,100) g;
 insert into test_multirange_gist select int4multirange(int4range(g*10, g*20, '(]'), int4range(g*20, NULL, '(]')) from generate_series(1,100) g;
 create index test_mulrirange_gist_idx on test_multirange_gist using gist (mr);
+-- test statistics and selectivity estimation as well
+--
+-- We don't check the accuracy of selectivity estimation, but at least check
+-- it doesn't fall.
+analyze test_multirange_gist;
 -- first, verify non-indexed results
 SET enable_seqscan    = t;
 SET enable_indexscan  = f;

src/test/regress/expected/rangetypes.out

@@ -792,6 +792,11 @@ insert into test_range_gist select 'empty'::int4range from generate_series(1,500
 insert into test_range_gist select int4range(NULL,g*10,'(]') from generate_series(1,100) g;
 insert into test_range_gist select int4range(g*10,NULL,'(]') from generate_series(1,100) g;
 insert into test_range_gist select int4range(g, g+10) from generate_series(1,2000) g;
+-- test statistics and selectivity estimation as well
+--
+-- We don't check the accuracy of selectivity estimation, but at least check
+-- it doesn't fall.
+analyze test_range_gist;
 -- first, verify non-indexed results
 SET enable_seqscan    = t;
 SET enable_indexscan  = f;

src/test/regress/sql/multirangetypes.sql

@@ -423,6 +423,12 @@ insert into test_multirange_gist select int4multirange(int4range(NULL, g*10, '(]
 insert into test_multirange_gist select int4multirange(int4range(g*10, g*20, '(]'), int4range(g*20, NULL, '(]')) from generate_series(1,100) g;
 create index test_mulrirange_gist_idx on test_multirange_gist using gist (mr);
 
+-- test statistics and selectivity estimation as well
+--
+-- We don't check the accuracy of selectivity estimation, but at least check
+-- it doesn't fall.
+analyze test_multirange_gist;
+
 -- first, verify non-indexed results
 SET enable_seqscan    = t;
 SET enable_indexscan  = f;

src/test/regress/sql/rangetypes.sql

@@ -216,6 +216,12 @@ insert into test_range_gist select int4range(NULL,g*10,'(]') from generate_serie
 insert into test_range_gist select int4range(g*10,NULL,'(]') from generate_series(1,100) g;
 insert into test_range_gist select int4range(g, g+10) from generate_series(1,2000) g;
 
+-- test statistics and selectivity estimation as well
+--
+-- We don't check the accuracy of selectivity estimation, but at least check
+-- it doesn't fall.
+analyze test_range_gist;
+
 -- first, verify non-indexed results
 SET enable_seqscan    = t;
 SET enable_indexscan  = f;