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3 Commits

Author SHA1 Message Date
Nikolai Kochetov
032e8c8aff Try fix test. 2019-11-08 20:44:55 +03:00
Azat Khuzhin
0677ae048c Wrap _shard_num with toUInt32 for simpler JOIN with system.clusters.shard_num 2019-11-06 21:02:42 +03:00
Azat Khuzhin
81aeff2d2a Add _shard_num virtual column for the Distributed engine 
With JOIN from system.clusters one can figure out from which server data
came.

TODO:
- optimization to avoid communicating with unrelated shards (for queries
  like "AND _shard_num = n")
- fix aliases (see tests with serverError expected)

v0: AddingConstColumnBlockInputStream
v2: VirtualColumnUtils::rewriteEntityInAst
v3: fix remote(Distributed) by appending _shard_num only if has been requested
 2019-11-06 15:26:12 +03:00