Avoid extra dependency in Compiler (used with compile = 1 setting)

Fix formula for new_size in WriteBufferFromVector(AppendModeTag).

Disable consecutive key optimization for UInt8/16.

Fixed the possibility of hanging queries when server is overloaded

Update hyperscan; avoid hyperscan rebuilds

Removed table function "catBoostPool" and storage "CatBoostPool"

Added performance test to show degradation of performance in gcc-9 in more isolated way.

Fix FPE in yandexConsistentHash function

More validation of part_name

Return Bad Request for INCORRECT_DATA and TYPE_MISMATCH errors

Fix bool settings parsing

 Fix LowCardinality arguments conversion in AggregateFunctionFactory

Make PairNoInit a simple struct.

TTL improvements.

Fix crash on CAST exotic types to Decimal

Fix join_use_nulls. Nulls in JOIN keys issue

These types use a FixedHashMap for aggregation, which makes lookup
almost free, so we don't have to cache the last lookup result.

This is a part of StringHashMap PR #5417 by Amos Bird.