[parser] yy_parser: enable supportWindowFunc by default (#986)
[parser] yy_parser: enable supportWindowFunc by default (#986)

Co-authored-by: crazycs <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>
pingcap/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,coocood/tidb,c4pt0r/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,coocood/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb