* support thresh in dropna

* update docstring, and polish function

* fix mypy

…e` (#1892)

* feat: support bpd.Series(json_data, dtype="json")

* undo dtypes._dtype_from_string and apply json only

…ames (#1841)

* code update

* update init file

* add more testcases and demo notebook

* add testcase for anywidget buttons

* move js code to a separate file

* fix owlbot.py

* remove extra line

* modify testcase

* add cleanup session

* use traceback

* no need of fall back method

* use test-specific small data instead

* testcase update

* handle opitonal import

* polish python function

* remove duplicate warning

* finish touch up

* use WIDGET_BASE

* code change, add more tests

* change function name

* remove widget reuse

* remove weakref import

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

* feat: support date data type for to_datetime()

* add test preconditions

* fix test

* fix lint

* fix tests

* fix lint

* fix test

* update docstring

* update docstring

* refactor: add compile_aggregate

* resolve aggregation nodes for dtype and support dropna

* generate more compact aggregation SQL

…atches (#1907)

* chore: update benchmark to assert on empty df returned by to_pandas_batches

* lint

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>