fix: support COMMENT before AS SELECT in CREATE MATERIALIZED VIEW

ClickHouse's SHOW CREATE TABLE outputs COMMENT between the column list
and AS SELECT, but the parser only tried COMMENT after AS SELECT.

Now tries COMMENT in both positions:
- Before AS SELECT (SHOW CREATE TABLE format)
- After AS SELECT (documented syntax)

Fixes #261

Author: sharadgaur

parser/parser_view.go

@@ -141,6 +141,15 @@ func (p *Parser) parseCreateMaterializedView(pos Pos) (*CreateMaterializedView,
 		createMaterializedView.StatementEnd = p.Pos()
 	}
 
+	// COMMENT can appear either before or after AS SELECT.
+	// ClickHouse's SHOW CREATE TABLE outputs COMMENT before AS SELECT,
+	// but the documented syntax shows it after.
+	comment, err := p.tryParseComment()
+	if err != nil {
+		return nil, err
+	}
+	createMaterializedView.Comment = comment
+
 	if p.tryConsumeKeywords(KeywordAs) {
 		subQuery, err := p.parseSubQuery(p.Pos())
 		if err != nil {
@@ -150,11 +159,14 @@ func (p *Parser) parseCreateMaterializedView(pos Pos) (*CreateMaterializedView,
 		createMaterializedView.StatementEnd = subQuery.End()
 	}
 
-	comment, err := p.tryParseComment()
-	if err != nil {
-		return nil, err
+	// Also try parsing COMMENT after AS SELECT (documented syntax)
+	if createMaterializedView.Comment == nil {
+		comment, err = p.tryParseComment()
+		if err != nil {
+			return nil, err
+		}
+		createMaterializedView.Comment = comment
 	}
-	createMaterializedView.Comment = comment
 	return createMaterializedView, nil
 }