This commit adds checks in place during table creation
and updates to ensure that we don't allow `CODEC` for
ALIAS (`default_type` column) like:
```sql
CREATE TABLE compression_codec_on_alias
(
`c0` ALIAS c1 CODEC(ZSTD),
`c1` UInt64
)
ENGINE = MergeTree()
PARTITION BY c0
ORDER BY c1;
```
After these safeguards in place, when trying to create/update column
codec, we will get excaptions like this:
```sql
-- create
CREATE TABLE compression_codec_on_alias
(
`c0` ALIAS c1 CODEC(ZSTD),
`c1` UInt64
)
ENGINE = MergeTree()
PARTITION BY c0
ORDER BY c1
Received exception from server (version 20.8.1):
Code: 377. DB::Exception: Received from localhost:9000. DB::Exception: Cannot specify codec for column type ALIAS.
0 rows in set. Elapsed: 0.006 sec.
-- modify
ALTER TABLE compression_codec_on_alias
ADD COLUMN `c3` ALIAS c2 CODEC(ZSTD) AFTER c2
Received exception from server (version 20.8.1):
Code: 377. DB::Exception: Received from localhost:9000. DB::Exception: Cannot specify codec for column type ALIAS.
0 rows in set. Elapsed: 0.005 sec.
```
This PR adds a new setting called `min_index_granularity_bytes`.
If the `index_granularity_bytes` is > 0 and is lesser than the
`min_index_granularity_bytes`, throw an exception inside the
`registerStorageMergeTree.cpp` file.
CurrentMetrics::Increment add amount for specified metric only for the
lifetime of the object, but this is not the intention, since
DistributedFilesToInsert is a gauge and after #10263 it can exit from
the callback (and enter again later, for example after SYSTEM STOP
DISTRIBUTED SEND it will always exit from it, until SYSTEM START
DISTRIBUTED SEND).
So make Increment member of a class (this will also fix possible issues
with substructing value on DROP TABLE).
