From 336ea6e6ff1109e7b83370565e3cb211804fda0c Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Tue, 27 Jul 2021 15:01:49 -0400
Subject: Fix bugs in polymorphic-argument resolution for multiranges.

We failed to deal with an UNKNOWN-type input for
anycompatiblemultirange; that should throw an error indicating
that we don't know how to resolve the multirange type.

We also failed to infer the type of an anycompatiblerange output
from an anycompatiblemultirange input or vice versa.

Per bug #17066 from Alexander Lakhin.  Back-patch to v14
where multiranges were added.

Discussion: https://postgr.es/m/17066-16a37f6223a8470b@postgresql.org
---
 src/test/regress/sql/polymorphism.sql | 48 +++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

(limited to 'src/test/regress/sql/polymorphism.sql')

diff --git a/src/test/regress/sql/polymorphism.sql b/src/test/regress/sql/polymorphism.sql
index 891b023ada0..fa57db6559c 100644
--- a/src/test/regress/sql/polymorphism.sql
+++ b/src/test/regress/sql/polymorphism.sql
@@ -126,6 +126,54 @@ select x, pg_typeof(x), y, pg_typeof(y)
 drop function polyf(a anyelement, b anyarray,
                     c anycompatible, d anycompatible);
 
+create function polyf(anyrange) returns anymultirange
+as 'select multirange($1);' language sql;
+
+select polyf(int4range(1,10));
+select polyf(null);
+
+drop function polyf(anyrange);
+
+create function polyf(anymultirange) returns anyelement
+as 'select lower($1);' language sql;
+
+select polyf(int4multirange(int4range(1,10), int4range(20,30)));
+select polyf(null);
+
+drop function polyf(anymultirange);
+
+create function polyf(anycompatiblerange) returns anycompatiblemultirange
+as 'select multirange($1);' language sql;
+
+select polyf(int4range(1,10));
+select polyf(null);
+
+drop function polyf(anycompatiblerange);
+
+create function polyf(anymultirange) returns anyrange
+as 'select range_merge($1);' language sql;
+
+select polyf(int4multirange(int4range(1,10), int4range(20,30)));
+select polyf(null);
+
+drop function polyf(anymultirange);
+
+create function polyf(anycompatiblemultirange) returns anycompatiblerange
+as 'select range_merge($1);' language sql;
+
+select polyf(int4multirange(int4range(1,10), int4range(20,30)));
+select polyf(null);
+
+drop function polyf(anycompatiblemultirange);
+
+create function polyf(anycompatiblemultirange) returns anycompatible
+as 'select lower($1);' language sql;
+
+select polyf(int4multirange(int4range(1,10), int4range(20,30)));
+select polyf(null);
+
+drop function polyf(anycompatiblemultirange);
+
 
 --
 -- Polymorphic aggregate tests
-- 
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