Fix DESCRIBE parsing to handle SETTINGS after FORMAT

- Swap order of FORMAT/SETTINGS parsing in DESCRIBE statement
- SETTINGS can come after FORMAT clause in ClickHouse

Fixes 02026_describe_include_subcolumns/stmt5

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

Author: kyleconroy

parser/parser.go

@@ -6347,12 +6347,6 @@ func (p *Parser) parseDescribe() *ast.DescribeQuery {
 		}
 	}
 
-	// Parse SETTINGS clause
-	if p.currentIs(token.SETTINGS) {
-		p.nextToken()
-		desc.Settings = p.parseSettingsList()
-	}
-
 	// Parse FORMAT clause
 	if p.currentIs(token.FORMAT) {
 		p.nextToken()
@@ -6362,6 +6356,12 @@ func (p *Parser) parseDescribe() *ast.DescribeQuery {
 		}
 	}
 
+	// Parse SETTINGS clause (can come after FORMAT)
+	if p.currentIs(token.SETTINGS) {
+		p.nextToken()
+		desc.Settings = p.parseSettingsList()
+	}
+
 	return desc
 }
 

parser/testdata/02026_describe_include_subcolumns/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt5": true
-  }
-}
+{}