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4 commits

Author SHA1 Message Date
Roman Nozdrin
9fce942878 MDEV-19831 find_select_handler() now tries its best to find a 
handlerton that is able to processes the whole query. For that it
traverses tables from subqueries.

Select_handler now cleans up temporary table structures on dctor call.
 2019-08-24 20:49:15 +03:00
Igor Babaev
27c3abde30 MDEV-17096 Pushdown of simple derived tables to storage engines 
MDEV-17631 select_handler for a full query pushdown

Added comments and file headers for files introduced in these tasks.
 2019-02-12 22:56:24 -08:00
Igor Babaev
d11be23933 MDEV-17096 Pushdown of simple derived tables to storage engines 
Resolved the problem of forming a proper query string for FEDERATEDX.
Added test cases.

Cleanup of extra spaces.
 2019-02-09 22:54:26 -08:00
Igor Babaev
16327fc2e7 MDEV-17096 Pushdown of simple derived tables to storage engines 
MDEV-17631 select_handler for a full query pushdown

Interfaces + Proof of Concept for federatedx with test cases.

The interfaces have been developed for integration of ColumnStore engine.
 2019-02-06 17:02:44 -08:00