Fix some flaky tests: test_mysql_federated and 00652_replicated_mutations_zookeeper

Add support for "Raw" column format for Regexp format

Continuation of #14791

add event_time_microseconds field for system.{trace,text,query,query_thread}_log tables

Set sanitizers options in the current shell too

Fix bug for LineAsString Format

fix bug for building query_db_generator.cpp

Fix hang of queries with a lot of subqueries to same mysql table

Try fix race on Context::settings

Prepare for LLVM-11

Replace useless multiset with unordered_set

Tests/partition pruning

Query obfuscator

Fix ASTColumnsReplaceTransformer::Replacement::clone()

Fix flaky integration test

Fix race condition between write ahead log cleanup and rename

Fix for default database race on server startup

Update ForkProcessor.cpp