Fix for antlr#4306

kaby76 · Nov 3, 2024 · b3c7025 · b3c7025
1 parent 93e0d24
commit b3c7025
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/sql/postgresql/CSharp/PostgreSQLParserBase.cs b/sql/postgresql/CSharp/PostgreSQLParserBase.cs
@@ -120,4 +120,12 @@ public PostgreSQLParser getPostgreSQLParser(string script)
         parser.AddErrorListener(listener_parser);
         return parser;
     }
+
+    // Make sure to only allow these as unary, postfix operators.
+    public bool OnlyAcceptableOps()
+    {
+        var c = ((CommonTokenStream)this.InputStream).LT(1);
+        var text = c.Text;
+        return text == "!" || text == "!!";
+    }
 }
diff --git a/sql/postgresql/PostgreSQLParser.g4 b/sql/postgresql/PostgreSQLParser.g4
@@ -3545,7 +3545,7 @@ a_expr
 /*19*/
 
 a_expr_qual
-    : a_expr_lessless qual_op?
+    : a_expr_lessless ({ this.OnlyAcceptableOps() }? qual_op | )
     ;
 
 /*18*/