Type:
Task
Priority:
Minor
Resolution:
Duplicate
Hi guys, i have a table like this:
CREATE TABLE mov_boleto (
cc_hash_key VARCHAR(75) NOT NULL DEFAULT '',
linha_digitavel VARCHAR(54) NOT NULL DEFAULT '',
PRIMARY KEY (cc_hash_key),
INDEX linha_digitavel (linha_digitavel)
)
with 500k rows
i need to search part of 'linha_digitavel' field (the left part):
LEFT(linha_digitavel,37), but i'm having a problem....
check the query
SELECT cc_hash_key
FROM mov_boleto WHERE
left(linha_digitavel,37) IN ("34191.09008 27471.621287 27580.420001","34191.09008 27471.701287 27580.422001");
the problem is the optimization...
"Using where", 521069 rows
could it use the index linha_digitavel? like the "LIKE" operator?
SELECT cc_hash_key
FROM mov_boleto WHERE
linha_digitavel like "34191.09008 27471.621287 27580.420001%" OR
linha_digitavel like "34191.09008 27471.621287 27580.422001%" OR
linha_digitavel ="34191.09008 27471.621287 27580.420001" OR
linha_digitavel ="34191.09008 27471.621287 27580.422001"
explain=> "Using index condition; Using where", rows =2
could SUBSTRING(char field,1,?) and LEFT(char_field,?)
FUNCTIONS be optimized for search?
--------
i'm thinking about a query rewrite in sql_select.cc or opt_range.cc, i think that opt_range.cc is better
but we can optimize ENUM too when MDEV-4419 is done, in this case sql_select.cc is a better place to optimize...
the point is, optimize rewrinting this:
LEFT(column,1234) = "some string"
or
SUBSTR(column,1,1234) = "some string"
to
(LEFT(column,1234) = "some string" AND column LIKE "some string%")
or
(SUBSTR(column,1,1234) = "some string" AND column LIKE "some string%")
and this:
LEFT(column,1234) IN ('string1','string2','string3')
to
(LEFT(column,1234) IN ('string1','string2','string3') AND
(
LEFT(column,1234) LIKE 'string1%' OR
LEFT(column,1234) LIKE 'string2%' OR
LEFT(column,1234) LIKE 'string3%'
)
)
or rewrite the LEFT(column,1234) to a virtual column, if it's exists, in this case we can use index
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i tryed
explain
SELECT cc_hash_key
FROM mov_boleto WHERE
CAST(linha_digitavel AS char(37)) in
("34191.09008 27471.621287 27580.420001","34191.09008 27471.621287 27580.422001")
no sucess, >500k rows in explain