Fix backwards test in operator_precedence_warning logic.

tglsfdc · tglsfdc · commit 930930c47663 · 2019-04-10T19:02:32.000-04:00
Warnings about unary minus might have been wrong. It's a bit surprising that nobody noticed yet ... probably the precedence-warning feature hasn't really been used much in the field. Rikard Falkeborn Discussion: https://postgr.es/m/CADRDgG6fzA8A2oeygUw4=o7ywo4kvz26NxCSgpq22nMD73Bx4Q@mail.gmail.com
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
@@ -3154,7 +3154,7 @@ operator_precedence_group(Node *node, const char **nodename)
 				*nodename = strVal(linitial(aexpr->name));
 				/* Ignore if op was always higher priority than IS-tests */
 				if (strcmp(*nodename, "+") == 0 ||
-					strcmp(*nodename, "-"))
+					strcmp(*nodename, "-") == 0)
 					group = 0;
 				else
 					group = PREC_GROUP_PREFIX_OP;
