At file:///home/psergey/dev/maria-5.2-dsmrr/
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revno: 2733
revision-id: psergey@askmonty.org-20091215071646-gbq7406d2xpopd82
parent: igor@askmonty.org-20091112043128-yd6odg8zr5ribjal
committer: Sergey Petrunya
branch nick: maria-5.2-dsmrr
timestamp: Tue 2009-12-15 10:16:46 +0300
message:
Backport into MariaDB-5.2 the following:
WL#2474 "Multi Range Read: Change the default MRR implementation to implement new MRR interface"
WL#2475 "Batched range read functions for MyISAM/InnoDb"
"Index condition pushdown for MyISAM/InnoDB"
Igor's fix from sp1r-igor@olga.mysql.com-20080330055902-07614:
There could be observed the following problems:
1. EXPLAIN did not mention pushdown conditions from on expressions in the
'extra' column. As a result if a query had no where conditions pushed
down to a table, but had on conditions pushed to this table the 'extra'
column in the EXPLAIN for the table missed 'using where'.
2. Conditions for ref access were not eliminated from on expressions
though such conditions were eliminated from the where condition.
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