allow to use standard syntax for named arguments for plpgsql cursor arguments

Author: [email protected]

doc/src/sgml/plpgsql.sgml

@@ -3317,7 +3317,7 @@ OPEN curs1 FOR EXECUTE format('SELECT * FROM %I WHERE col1 = $1',tabname) USING
      <title>Opening a Bound Cursor</title>
 
 <synopsis>
-OPEN <replaceable>bound_cursorvar</replaceable> <optional> ( <optional> <replaceable>argument_name</replaceable> := </optional> <replaceable>argument_value</replaceable> <optional>, ...</optional> ) </optional>;
+OPEN <replaceable>bound_cursorvar</replaceable> <optional> ( <optional> <replaceable>argument_name</replaceable> { := | => } </optional> <replaceable>argument_value</replaceable> <optional>, ...</optional> ) </optional>;
 </synopsis>
 
          <para>
@@ -3352,6 +3352,7 @@ OPEN <replaceable>bound_cursorvar</replaceable> <optional> ( <optional> <replace
 OPEN curs2;
 OPEN curs3(42);
 OPEN curs3(key := 42);
+OPEN curs3(Key => 42);
 </programlisting>
          </para>
 

src/pl/plpgsql/src/pl_gram.y

@@ -3955,9 +3955,12 @@ read_cursor_args(PLpgSQL_var *cursor, int until, YYSTYPE *yylvalp, YYLTYPE *yyll
 					tok2;
 		int			arglocation;
 
-		/* Check if it's a named parameter: "param := value" */
+		/*
+		 * Check if it's a named parameter: "param := value"
+		 * or "param => value"
+		 */
 		plpgsql_peek2(&tok1, &tok2, &arglocation, NULL, yyscanner);
-		if (tok1 == IDENT && tok2 == COLON_EQUALS)
+		if (tok1 == IDENT && (tok2 == COLON_EQUALS || tok2 == EQUALS_GREATER))
 		{
 			char	   *argname;
 			IdentifierLookup save_IdentifierLookup;
@@ -3983,11 +3986,11 @@ read_cursor_args(PLpgSQL_var *cursor, int until, YYSTYPE *yylvalp, YYLTYPE *yyll
 						 parser_errposition(*yyllocp)));
 
 			/*
-			 * Eat the ":=". We already peeked, so the error should never
-			 * happen.
+			 * Eat the ":=" and the "=>". We already peeked, so the error should
+			 * never happen.
 			 */
 			tok2 = yylex(yylvalp, yyllocp, yyscanner);
-			if (tok2 != COLON_EQUALS)
+			if (tok2 != COLON_EQUALS && tok2 != EQUALS_GREATER)
 				yyerror(yyllocp, NULL, yyscanner, "syntax error");
 
 			any_named = true;

src/test/regress/expected/plpgsql.out

@@ -2419,7 +2419,8 @@ declare
   p2 int4 := 1006;
   n int4;
 begin
-  open c1 (p1 := p1, p2 := p2, debug := 2);
+  -- use both supported syntaxes for named arguments
+  open c1 (p1 := p1, p2 => p2, debug => 2);
   fetch c1 into n;
   return n;
 end $$ language plpgsql;

src/test/regress/sql/plpgsql.sql

@@ -2072,7 +2072,8 @@ declare
   p2 int4 := 1006;
   n int4;
 begin
-  open c1 (p1 := p1, p2 := p2, debug := 2);
+  -- use both supported syntaxes for named arguments
+  open c1 (p1 := p1, p2 => p2, debug => 2);
   fetch c1 into n;
   return n;
 end $$ language plpgsql;