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4 Commits

Author SHA1 Message Date
Alexey Zatelepin
3344955154 separate Read and Write lock holders, better method names 2019-03-07 21:10:21 +03:00
Alexey Zatelepin
0d7ab9e3ea allow acquiring read lock to a table out of order if it was already locked by the same query [#CLICKHOUSE-3789] 
this is important in preventing ALTER deadlocks
 2019-02-27 21:34:38 +03:00
Amos Bird
d8eba7e71b Better joinGet. 2019-01-25 23:38:13 +08:00
Amos Bird
65b654a1b6 Versatile StorageJoin 
This commit does the following:

1. StorageJoin with simple keys now supports reading
2. StorageJoin can be created with Join settings applied. Syntax is
similar to MergeTree and Kafka
3. Left Any StorageJoin with one simple key can be used as a
dictionary-like structure by function joinGet.

Examples are listed in the related test file.
 2018-12-02 16:49:39 +08:00