Additional tests for range_intersect_agg(anymultirange)

Author: Paul Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Chapman Flack <chap@anastigmatix.net>
Discussion: https://www.postgresql.org/message-id/flat/007ef255-35ef-fd26-679c-f97e7a7f30c2@illuminatedcomputing.com

src/test/regress/expected/multirangetypes.out

@@ -2784,6 +2784,9 @@ FROM    (VALUES
  {[a,f],[g,j)}
 (1 row)
 
+--
+-- range_intersect_agg function
+--
 select range_intersect_agg(nmr) from nummultirange_test;
  range_intersect_agg 
 ---------------------
@@ -2796,13 +2799,49 @@ select range_intersect_agg(nmr) from nummultirange_test where false;
  
 (1 row)
 
+select range_intersect_agg(null::nummultirange) from nummultirange_test;
+ range_intersect_agg 
+---------------------
+ 
+(1 row)
+
+select range_intersect_agg(nmr) from (values ('{[1,3]}'::nummultirange), ('{[6,12]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {}
+(1 row)
+
+select range_intersect_agg(nmr) from (values ('{[1,6]}'::nummultirange), ('{[3,12]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {[3,6]}
+(1 row)
+
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange), ('{[4,14]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {[4,6],[10,12]}
+(1 row)
+
 -- test with just one input:
+select range_intersect_agg(nmr) from (values ('{}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {}
+(1 row)
+
 select range_intersect_agg(nmr) from (values ('{[1,2]}'::nummultirange)) t(nmr);
  range_intersect_agg 
 ---------------------
  {[1,2]}
 (1 row)
 
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {[1,6],[10,12]}
+(1 row)
+
 select range_intersect_agg(nmr) from nummultirange_test where nmr @> 4.0;
  range_intersect_agg 
 ---------------------

src/test/regress/sql/multirangetypes.sql

@@ -572,10 +572,19 @@ FROM    (VALUES
           ('[h,j)'::textrange)
         ) t(r);
 
+--
+-- range_intersect_agg function
+--
 select range_intersect_agg(nmr) from nummultirange_test;
 select range_intersect_agg(nmr) from nummultirange_test where false;
+select range_intersect_agg(null::nummultirange) from nummultirange_test;
+select range_intersect_agg(nmr) from (values ('{[1,3]}'::nummultirange), ('{[6,12]}'::nummultirange)) t(nmr);
+select range_intersect_agg(nmr) from (values ('{[1,6]}'::nummultirange), ('{[3,12]}'::nummultirange)) t(nmr);
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange), ('{[4,14]}'::nummultirange)) t(nmr);
 -- test with just one input:
+select range_intersect_agg(nmr) from (values ('{}'::nummultirange)) t(nmr);
 select range_intersect_agg(nmr) from (values ('{[1,2]}'::nummultirange)) t(nmr);
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange)) t(nmr);
 select range_intersect_agg(nmr) from nummultirange_test where nmr @> 4.0;
 
 create table nummultirange_test2(nmr nummultirange);