Replacing Merge Tree
1	2020-01-01 00:00:00
2	2020-01-02 00:00:00
Collapsing Merge Tree
1	1	2020-01-01 00:00:00
Versioned Collapsing Merge Tree
1	1	2	2020-01-01 00:00:00
Summing Merge Tree
1	6	2020-01-01 00:00:00
2	6	2020-01-02 00:00:00
Aggregating Merge Tree
1	5	2020-01-01 00:00:00
2	5	2020-01-02 00:00:00
Check creating empty parts