From 23500a8a122b71181b1292b8375873d06d31bc2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?griff=20=D1=96=E2=8A=99?=
 <346896+griffio@users.noreply.github.com>
Date: Thu, 3 Apr 2025 15:44:33 +0100
Subject: [PATCH] Update sql.bnf

Add back the optional join_constraint - seems to create the missing join condition

Note - We don't need to remove the other uses of optional join_constraint
---
 core/src/main/kotlin/com/alecstrong/sql/psi/core/sql.bnf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/kotlin/com/alecstrong/sql/psi/core/sql.bnf b/core/src/main/kotlin/com/alecstrong/sql/psi/core/sql.bnf
index 2b3c89a6..fbf3164a 100644
--- a/core/src/main/kotlin/com/alecstrong/sql/psi/core/sql.bnf
+++ b/core/src/main/kotlin/com/alecstrong/sql/psi/core/sql.bnf
@@ -390,7 +390,7 @@ full_join_operator ::= FULL
 
 join_operator ::= ( COMMA
                   | [ NATURAL ] [ left_join_operator [ OUTER ] | INNER | CROSS ] JOIN )
-join_constraint ::= ON expr | USING LP column_name ( COMMA column_name ) * RP
+join_constraint ::= [ ON expr | USING LP column_name ( COMMA column_name ) * RP ]
 ordering_term ::= expr [ COLLATE collation_name ] [ ASC | DESC ] {
   mixin = "com.alecstrong.sql.psi.core.psi.mixins.OrderByMixin"
 }