Skip FINAL keyword in DESCRIBE to parse SETTINGS clause

The FINAL keyword can appear after table function in DESCRIBE and
needs to be skipped so SETTINGS clause is properly parsed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

parser/parser.go

@@ -6374,6 +6374,11 @@ func (p *Parser) parseDescribe() *ast.DescribeQuery {
 		}
 	}
 
+	// Skip FINAL keyword if present (can appear after table function)
+	if p.currentIs(token.FINAL) {
+		p.nextToken()
+	}
+
 	// Parse FORMAT clause
 	if p.currentIs(token.FORMAT) {
 		p.nextToken()

parser/testdata/03752_constant_expression_with_untuple/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt3": true
-  }
-}
+{}