postgres.git / summary / log / commit / refs

commit    8d2beee027af41a6b66c670b6a595895f24a1bb0
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Sat Jul 18 16:57:42 2026 +0000

    Restore the ability to use | and -> as prefix operators.
    
    Commit 2f094e7ac changed the parser to treat these as built-in
    operator names, where before they were just generic Op.  While
    it correctly gave them the same precedence as Op and added new
    productions to allow them to still be used as infix operators,
    it missed allowing them to still be used as prefix operators.
    At least one extension expects to be able to do that, so add
    the necessary productions.
    
    Bug: #19558
    Reported-by: Pierre Senellart <pierre@senellart.com>
    Author: Pierre Forstmann <pierre.forstmann@gmail.com>
    Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
    Discussion: https://postgr.es/m/19558-ad1fca59a3a471a0@postgresql.org
    Backpatch-through: 19


 src/backend/parser/gram.y | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index e1e65c414db..4b152c294ca 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -15884,6 +15884,10 @@ a_expr:		c_expr									{ $$ = $1; }
 				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $3, @2); }
 			| a_expr NOT_EQUALS a_expr
 				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<>", $1, $3, @2); }
+			| RIGHT_ARROW a_expr
+				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "->", NULL, $2, @1); }
+			| '|' a_expr
+				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "|", NULL, $2, @1); }
 			| a_expr RIGHT_ARROW a_expr
 				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "->", $1, $3, @2); }
 			| a_expr '|' a_expr
@@ -16368,6 +16372,10 @@ b_expr:		c_expr
 				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, ">=", $1, $3, @2); }
 			| b_expr NOT_EQUALS b_expr
 				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "<>", $1, $3, @2); }
+			| RIGHT_ARROW b_expr
+				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "->", NULL, $2, @1); }
+			| '|' b_expr
+				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "|", NULL, $2, @1); }
 			| b_expr RIGHT_ARROW b_expr
 				{ $$ = (Node *) makeSimpleA_Expr(AEXPR_OP, "->", $1, $3, @2); }
 			| b_expr '|' b_expr


[parent: e727c6f2ef5c]