@Override
		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
			if ( visitor instanceof MixedFormatSqlExtendVisitor ) return ((MixedFormatSqlExtendVisitor<? extends T>)visitor).visitFromStmt(this);
			else return visitor.visitChildren(this);
		}
When true, the behavior of keywords follows ANSI SQL standard.
amoro-format-mixed/amoro-mixed-spark/v3.5/amoro-mixed-spark-3.5/src/main/gen-antlr/org/apache/amoro/spark/sql/parser/MixedFormatSqlExtendParser.java