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diff --git a/src/test/regress/sql/expressions.sql b/src/test/regress/sql/expressions.sql
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+--
+-- expression evaluation tests that don't fit into a more specific file
+--
+
+--
+-- Tests for SQLValueFunction
+--
+
+
+-- current_date  (always matches because of transactional behaviour)
+SELECT date(now())::text = current_date::text;
+
+
+-- current_time / localtime
+SELECT now()::timetz::text = current_time::text;
+SELECT now()::timetz(4)::text = current_time(4)::text;
+SELECT now()::time::text = localtime::text;
+SELECT now()::time(3)::text = localtime(3)::text;
+
+-- current_time[stamp]/ localtime[stamp] (always matches because of transactional behaviour)
+SELECT current_timestamp = NOW();
+-- precision
+SELECT length(current_timestamp::text) >= length(current_timestamp(0)::text);
+-- localtimestamp
+SELECT now()::timestamp::text = localtimestamp::text;
+-- precision overflow
+SELECT current_time = current_time(7);
+SELECT current_timestamp = current_timestamp(7);
+SELECT localtime = localtime(7);
+SELECT localtimestamp = localtimestamp(7);
+
+-- current_role/user/user is tested in rolenames.sql
+
+-- current database / catalog
+SELECT current_catalog = current_database();
+
+-- current_schema
+SELECT current_schema;
+SET search_path = 'notme';
+SELECT current_schema;
+SET search_path = 'pg_catalog';
+SELECT current_schema;
+RESET search_path;
+
+
+--
+-- Test parsing of a no-op cast to a type with unspecified typmod
+--
+begin;
+
+create table numeric_tbl (f1 numeric(18,3), f2 numeric);
+
+create view numeric_view as
+  select
+    f1, f1::numeric(16,4) as f1164, f1::numeric as f1n,
+    f2, f2::numeric(16,4) as f2164, f2::numeric as f2n
+  from numeric_tbl;
+
+\d+ numeric_view
+
+explain (verbose, costs off) select * from numeric_view;
+
+-- bpchar, lacking planner support for its length coercion function,
+-- could behave differently
+
+create table bpchar_tbl (f1 character(16) unique, f2 bpchar);
+
+create view bpchar_view as
+  select
+    f1, f1::character(14) as f114, f1::bpchar as f1n,
+    f2, f2::character(14) as f214, f2::bpchar as f2n
+  from bpchar_tbl;
+
+\d+ bpchar_view
+
+explain (verbose, costs off) select * from bpchar_view
+  where f1::bpchar = 'foo';
+
+rollback;
+
+
+--
+-- Ordinarily, IN/NOT IN can be converted to a ScalarArrayOpExpr
+-- with a suitably-chosen array type.
+--
+explain (verbose, costs off)
+select random() IN (1, 4, 8.0);
+explain (verbose, costs off)
+select random()::int IN (1, 4, 8.0);
+-- However, if there's not a common supertype for the IN elements,
+-- we should instead try to produce "x = v1 OR x = v2 OR ...".
+-- In most cases that'll fail for lack of all the requisite = operators,
+-- but it can succeed sometimes.  So this should complain about lack of
+-- an = operator, not about cast failure.
+select '(0,0)'::point in ('(0,0,0,0)'::box, point(0,0));
+
+
+--
+-- Tests for ScalarArrayOpExpr with a hashfn
+--
+
+-- create a stable function so that the tests below are not
+-- evaluated using the planner's constant folding.
+begin;
+
+create function return_int_input(int) returns int as $$
+begin
+	return $1;
+end;
+$$ language plpgsql stable;
+
+create function return_text_input(text) returns text as $$
+begin
+	return $1;
+end;
+$$ language plpgsql stable;
+
+select return_int_input(1) in (10, 9, 2, 8, 3, 7, 4, 6, 5, 1);
+select return_int_input(1) in (10, 9, 2, 8, 3, 7, 4, 6, 5, null);
+select return_int_input(1) in (null, null, null, null, null, null, null, null, null, null, null);
+select return_int_input(1) in (10, 9, 2, 8, 3, 7, 4, 6, 5, 1, null);
+select return_int_input(null::int) in (10, 9, 2, 8, 3, 7, 4, 6, 5, 1);
+select return_int_input(null::int) in (10, 9, 2, 8, 3, 7, 4, 6, 5, null);
+select return_text_input('a') in ('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j');
+-- NOT IN
+select return_int_input(1) not in (10, 9, 2, 8, 3, 7, 4, 6, 5, 1);
+select return_int_input(1) not in (10, 9, 2, 8, 3, 7, 4, 6, 5, 0);
+select return_int_input(1) not in (10, 9, 2, 8, 3, 7, 4, 6, 5, 2, null);
+select return_int_input(1) not in (10, 9, 2, 8, 3, 7, 4, 6, 5, 1, null);
+select return_int_input(1) not in (null, null, null, null, null, null, null, null, null, null, null);
+select return_int_input(null::int) not in (10, 9, 2, 8, 3, 7, 4, 6, 5, 1);
+select return_int_input(null::int) not in (10, 9, 2, 8, 3, 7, 4, 6, 5, null);
+select return_text_input('a') not in ('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j');
+
+rollback;
+
+-- Test with non-strict equality function.
+-- We need to create our own type for this.
+
+begin;
+
+create type myint;
+create function myintin(cstring) returns myint strict immutable language
+  internal as 'int4in';
+create function myintout(myint) returns cstring strict immutable language
+  internal as 'int4out';
+create function myinthash(myint) returns integer strict immutable language
+  internal as 'hashint4';
+
+create type myint (input = myintin, output = myintout, like = int4);
+
+create cast (int4 as myint) without function;
+create cast (myint as int4) without function;
+
+create function myinteq(myint, myint) returns bool as $$
+begin
+  if $1 is null and $2 is null then
+    return true;
+  else
+    return $1::int = $2::int;
+  end if;
+end;
+$$ language plpgsql immutable;
+
+create function myintne(myint, myint) returns bool as $$
+begin
+  return not myinteq($1, $2);
+end;
+$$ language plpgsql immutable;
+
+create operator = (
+  leftarg    = myint,
+  rightarg   = myint,
+  commutator = =,
+  negator    = <>,
+  procedure  = myinteq,
+  restrict   = eqsel,
+  join       = eqjoinsel,
+  merges
+);
+
+create operator <> (
+  leftarg    = myint,
+  rightarg   = myint,
+  commutator = <>,
+  negator    = =,
+  procedure  = myintne,
+  restrict   = eqsel,
+  join       = eqjoinsel,
+  merges
+);
+
+create operator class myint_ops
+default for type myint using hash as
+  operator    1   =  (myint, myint),
+  function    1   myinthash(myint);
+
+create table inttest (a myint);
+insert into inttest values(1::myint),(null);
+
+-- try an array with enough elements to cause hashing
+select * from inttest where a in (1::myint,2::myint,3::myint,4::myint,5::myint,6::myint,7::myint,8::myint,9::myint, null);
+select * from inttest where a not in (1::myint,2::myint,3::myint,4::myint,5::myint,6::myint,7::myint,8::myint,9::myint, null);
+select * from inttest where a not in (0::myint,2::myint,3::myint,4::myint,5::myint,6::myint,7::myint,8::myint,9::myint, null);
+-- ensure the result matched with the non-hashed version.  We simply remove
+-- some array elements so that we don't reach the hashing threshold.
+select * from inttest where a in (1::myint,2::myint,3::myint,4::myint,5::myint, null);
+select * from inttest where a not in (1::myint,2::myint,3::myint,4::myint,5::myint, null);
+select * from inttest where a not in (0::myint,2::myint,3::myint,4::myint,5::myint, null);
+
+rollback;