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| author | Igor Babaev <igor@askmonty.org> | 2019-02-12 22:56:24 -0800 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2019-02-12 22:56:24 -0800 |
| commit | 27c3abde3071ad2010cbcda5b07435ad15364a70 (patch) | |
| tree | 0d4e4066762076beaba6c8d2e774202be7146e2c /storage/federatedx | |
| parent | 17d00d9a94da2c2b57fc7cf75036d92ee6dc9298 (diff) | |
| download | mariadb-git-27c3abde3071ad2010cbcda5b07435ad15364a70.tar.gz | |
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.
Diffstat (limited to 'storage/federatedx')
| -rw-r--r-- | storage/federatedx/federatedx_pushdown.cc | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/storage/federatedx/federatedx_pushdown.cc b/storage/federatedx/federatedx_pushdown.cc index 906d87c29ce..2bcee943308 100644 --- a/storage/federatedx/federatedx_pushdown.cc +++ b/storage/federatedx/federatedx_pushdown.cc @@ -16,6 +16,25 @@ /* !!! For inclusion into ha_federatedx.cc */ + +/* + This is a quick a dirty implemention of the derived_handler and select_handler + interfaces to be used to push select queries and the queries specifying + derived tables into FEDERATEDX engine. + The functions + create_federatedx_derived_handler and + create_federatedx_select_handler + that return the corresponding interfaces for pushdown capabilities do + not check a lot of things. In particular they do not check that the tables + of the pushed queries belong to the same foreign server. + + The implementation is provided purely for testing purposes. + The pushdown capabilities are enabled by turning on the plugin system + variable federated_pushdown: + set global federated_pushdown=1; +*/ + + static derived_handler* create_federatedx_derived_handler(THD* thd, TABLE_LIST *derived) { |