fix: drop table if exists

test: add test case for pow functions

ci: add windows build test

fix(os): fix win max func error.

feature(udf):add test to jenkins

fix(query): do perform arithmetic operator before apply the sort procedure.

feature(udf): scalar memory management

fix(rpc): fix timeout error

fix(query): add hex encoding/decoding for transmitting nchar constant from client to server in JSON

feat(stream): insert data