Add collation assignment to CALL statement

Otherwise functions that require collation information will not have
it if they are called in arguments to a CALL statement.

Reported-by: Jean-Marc Voillequin <Jean-Marc.Voillequin@moodys.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/1EC8157EB499BF459A516ADCF135ADCE39FFAC54%40LON-WGMSX712.ad.moodys.net

src/backend/parser/analyze.c

@@ -2634,6 +2634,8 @@ transformCallStmt(ParseState *pstate, CallStmt *stmt)
 							 true,
 							 stmt->funccall->location);
 
+	assign_expr_collations(pstate, node);
+
 	stmt->funcexpr = castNode(FuncExpr, node);
 
 	result = makeNode(Query);

src/test/regress/expected/create_procedure.out

@@ -139,6 +139,13 @@ AS $$
 SELECT NULL::int;
 $$;
 CALL ptest6(1, 2);
+-- collation assignment
+CREATE PROCEDURE ptest7(a text, b text)
+LANGUAGE SQL
+AS $$
+SELECT a = b;
+$$;
+CALL ptest7(least('a', 'b'), 'a');
 -- various error cases
 CALL version();  -- error: not a procedure
 ERROR:  version() is not a procedure

src/test/regress/sql/create_procedure.sql

@@ -101,6 +101,17 @@ $$;
 CALL ptest6(1, 2);
 
 
+-- collation assignment
+
+CREATE PROCEDURE ptest7(a text, b text)
+LANGUAGE SQL
+AS $$
+SELECT a = b;
+$$;
+
+CALL ptest7(least('a', 'b'), 'a');
+
+
 -- various error cases
 
 CALL version();  -- error: not a procedure