Backport #16715 to 20.12: ISSUES-16605 fix without returning affected rows when insert select query in MySQL handler

Backport #16866 to 20.12: Fix strange code in InterpreterShowAccessQuery

Backport #16715 to 20.12: ISSUES-16605 fix without returning affected rows when insert select query in MySQL handler

Update cctz to the latest master, update tzdb to 2020d.

Minor grammar correction in error messages

Disable rotation of the logs in tests (on CI)

Make global_context consistent.

Add unique identifiers IMergeTreeDataPart structure

* Docs en,ru

* Explanation added
Co-authored-by: NOlga Revyakina <revolg@yandex-team.ru>

Cleanup settings handling in perf tests

Add missed <stdexcept>

fix toUInt256 stack overflow

Doc. removed obsolete info about groupby / sum

* Draft

* Draft+

* host fixes

* host fixes

* ++

* ++

* +++

* Edits, part 1: + parametres and clarification

* Edits

* Fix host

* Update docs/en/sql-reference/aggregate-functions/reference/initializeAggregation.md
Co-authored-by: NBayoNet <da-daos@yandex.ru>

* nano-fixes and russian translation

* Final edits
Co-authored-by: NBayoNet <da-daos@yandex.ru>

removed obsolete info about sum

removed obsolete info about sum

removed obsolete info about groupby

removed obsolete info about groupby

Remove Converting step and transform. Order inputs for ActionsDAG.

Thus they will be applied on reconnects, since clickhouse-driver may
implicitly do it if the connection has been failed.

Since if the connection will be closed (by some reason), then the
setting will not be applied after transparent reconnect (since only
native clickhouse-client can do this, since it parses the query, but
perf tests uses python driver).

Just use inplace SETTINGS clause or <settings>.

std::logic_error is used at line 294, so the appropriate header is required.

wrong translation

Fixed a problem with the translation of the document

Improvements in coverage images

Implement tcpPort() function for tests

fix wrong translation