Fix too early MySQL connection closure in MySQLBlockInputStreamream.cpp

Fix build error when cmake_minimum_required(3.12)

Split libdbms.so using object library

Use internal iteration over hash tables in Aggregator.

For compound hash tables such as the future StringHashMap, an
iterator-based API might be inefficient for iterating over a table or
for merging two tables, because:

1) the key has to be converted to a general format from a from a
   component-specific format, which may differ between the components;

2) the information about the component of the compound hash table to
   which the value belongs is lost, and has to be recalculated if the
   value is reinserted.

A more efficient approach is to use internal iteration, that is,
map-like functions, which avoids unnecessary conversions when iterating,
and allows to use an efficient component-wise approach when merging.

Now the linking time of incremental builds are around 1-2 seconds

Use separate key and "mapped" value references instead. This is
important for hash tables that do not store the key/"mapped" pair
directly, and cannot provide this interface without some runtime
overhead.

We don't need it anymore after we changed the hash table key memory
management to use callbacks. Removing this interface is important for
hash maps that do not store the key, such as FixedHashMap or the
prospective compound StringHashMap.

Use the right words

* Typo fix.

* Links fix.

* Fixed links in docs.

* More fixes.

* Typo fix.

* Links fix.

* Typo fix.

* DOCAPI-7745: The first version.

* DOCAPI-7745: More text

* DOCAPI-7745: More text.

* Update docs/en/operations/settings/settings.md
Co-Authored-By: NIvan Blinkov <github@blinkov.ru>

* Update docs/en/query_language/misc.md
Co-Authored-By: NIvan Blinkov <github@blinkov.ru>

* DOCAPI-7745: Fixes.

Doc change. TTL examples

Doc change. Added some system queries (1st attempt).

Doc Change. Fixed rowbinary RU translation and added rowbinarywithnamesandtypes

* Fix build

* cmake: fix cpuinfo

* Fix includes after processors merge

Conflicts:
	dbms/src/Processors/Formats/Impl/CapnProtoRowInputFormat.cpp
	dbms/src/Processors/Formats/Impl/ParquetBlockOutputFormat.cpp
	dbms/src/Processors/Formats/Impl/ProtobufRowInputFormat.cpp
	dbms/src/Processors/Formats/Impl/ProtobufRowOutputFormat.cpp

* Fix build in gcc8

* fix test link

* fix test link

* Fix test link

* link fix

* Fix includes after processors merge 2

Conflicts:
	dbms/src/Processors/Formats/Impl/ParquetBlockInputFormat.cpp

* Fix includes after processors merge 3

* link fix

* Fix likely/unlikely conflict with cython

* Fix conflict with protobuf/stubs/atomicops.h

* remove unlikely.h

* Fix macos build (do not use timer_t)

* wip

* Fix build (orc, ...)

* Missing files

* Try fix

* fix hdfs

* Fix llvm 7.1 find

Co-Authored-By: NIvan Blinkov <github@blinkov.ru>

Co-Authored-By: NIvan Blinkov <github@blinkov.ru>

Co-Authored-By: NIvan Blinkov <github@blinkov.ru>

Fixed rowbinary RU translation and added rowbinarywithnamesandtypes

Added RowBinaryWithNamesAndTypes toc. Fixed list formatting.

Fixed rowbinary translation and added rowbinarywithnamesandtypes

Fix formatting error

Releasing resources after query execution in MySQL compatibility server

Docs cleanup

Merging #5450 (table function input).

Unified formatting of the tables in system database
Removed extra line from settings