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This is needed to make clickhouse-copier work with cross-replication
setups (also known as [circular replication][1]).
When database name is not specified we rely on `<default_database>`
element from replica stanza.
Example:
```xml
<source_cluster>
<shard>
<replica>
<host>localhost</host>
<port>9000</port>
<default_database>r0</default_database>
</replica>
<replica>
<host>localhost</host>
<port>666</port>
<default_database>r1</default_database>
</replica>
</shard>
<shard>
<replica>
<host>localhost</host>
<port>666</port>
<default_database>r0</default_database>
</replica>
<replica>
<host>localhost</host>
<port>9000</port>
<default_database>r1</default_database>
</replica>
</shard>
</source_cluster>
```
[1]: https://www.altinity.com/blog/2018/5/10/circular-replication-cluster-topology-in-clickhouse
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| CMakeLists.txt | ||