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| author | Igor Babaev <igor@askmonty.org> | 2019-02-03 14:56:12 -0800 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2019-02-03 14:56:12 -0800 |
| commit | 658128af43b4d7c6db445164f8ed25ed4d1e3109 (patch) | |
| tree | 7a71580cca55759b8bb2730e117436478948d77f /mysql-test/main/ps_2myisam.result | |
| parent | 5f46670bd09babbee75a24ac82eb4ade0706da66 (diff) | |
| download | mariadb-git-658128af43b4d7c6db445164f8ed25ed4d1e3109.tar.gz | |
MDEV-16188 Use in-memory PK filters built from range index scans
This patch contains a full implementation of the optimization
that allows to use in-memory rowid / primary filters built for range
conditions over indexes. In many cases usage of such filters reduce
the number of disk seeks spent for fetching table rows.
In this implementation the choice of what possible filter to be applied
(if any) is made purely on cost-based considerations.
This implementation re-achitectured the partial implementation of
the feature pushed by Galina Shalygina in the commit
8d5a11122c32f4d9eb87536886c6e893377bdd07.
Besides this patch contains a better implementation of the generic
handler function handler::multi_range_read_info_const() that
takes into account gaps between ranges when calculating the cost of
range index scans. It also contains some corrections of the
implementation of the handler function records_in_range() for MyISAM.
This patch supports the feature for InnoDB and MyISAM.
Diffstat (limited to 'mysql-test/main/ps_2myisam.result')
| -rw-r--r-- | mysql-test/main/ps_2myisam.result | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mysql-test/main/ps_2myisam.result b/mysql-test/main/ps_2myisam.result index 3906875da92..c85abaad051 100644 --- a/mysql-test/main/ps_2myisam.result +++ b/mysql-test/main/ps_2myisam.result @@ -1161,7 +1161,7 @@ def possible_keys 253 4_OR_8_K 0 Y 0 39 8 def key 253 64 0 Y 0 39 8 def key_len 253 4_OR_8_K 0 Y 0 39 8 def ref 253 2048 0 Y 0 39 8 -def rows 8 10 1 Y 32928 0 63 +def rows 253 64 1 Y 0 39 8 def Extra 253 255 0 N 1 39 8 id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t9 ALL NULL NULL NULL NULL 2 |