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Backport into MariaDB-5.2 the following:

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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.
This commit is contained in:
Sergey Petrunya
2009-12-15 10:16:46 +03:00
parent e4e1ae0d13
commit 96e092dc73
136 changed files with 18754 additions and 1169 deletions
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2
mysql-test/r/merge.result
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@@ -673,7 +673,7 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT * FROM t1 WHERE fileset_id = 2
AND file_code BETWEEN '0000000115' AND '0000000120' LIMIT 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY,files PRIMARY 35 NULL 5 Using where
1 SIMPLE t1 range PRIMARY,files PRIMARY 35 NULL 5 Using index condition; Using MRR
EXPLAIN SELECT * FROM t2 WHERE fileset_id = 2
AND file_code = '0000000115' LIMIT 1;
id select_type table type possible_keys key key_len ref rows Extra