refactor: multi-process mode

feat: remove invalid udf function handle cache

fix: some problems of parser for stmt mode

fix(stream):valgrind error

fix(tmq): fix memory leak

refactor: do some internal refactor.

refactor: add the configuration of child table name

feat: fix udf memory memory found by valgrind

enh(query): filter the child table that are not belongs to current super table when adding into candidate list.

fix: mem size limit