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When there is no index defined filesort is used to sort the result of a query. If there is a function in the select list and the result set should be ordered by it's value then this function will be evaluated twice. First time to get the value of the sort key and second time to send its value to a user. This happens because filesort when sorts a table remembers only values of its fields but not values of functions. All functions are affected. But taking into account that SP and UDF functions can be both expensive and non-deterministic a temporary table should be used to store their results and then sort it to avoid twice SP evaluation and to get a correct result. If an expression referenced in an ORDER clause contains a SP or UDF function, force the use of a temporary table. A new Item_processor function called func_type_checker_processor is added to check whether the expression contains a function of a particular type.
111 lines
3.1 KiB
Text
111 lines
3.1 KiB
Text
drop table if exists t1;
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CREATE FUNCTION metaphon RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
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CREATE FUNCTION myfunc_double RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
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CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
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ERROR HY000: Can't find function 'myfunc_nonexist' in library
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CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
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CREATE FUNCTION sequence RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
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CREATE FUNCTION lookup RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
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CREATE FUNCTION reverse_lookup
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RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
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CREATE AGGREGATE FUNCTION avgcost
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RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
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select myfunc_double();
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ERROR HY000: myfunc_double must have at least one argument
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select myfunc_double(1);
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myfunc_double(1)
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49.00
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select myfunc_double(78654);
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myfunc_double(78654)
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54.00
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select myfunc_nonexist();
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ERROR 42000: FUNCTION test.myfunc_nonexist does not exist
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select myfunc_int();
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myfunc_int()
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0
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select lookup();
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ERROR HY000: Wrong arguments to lookup; Use the source
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select lookup("127.0.0.1");
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lookup("127.0.0.1")
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127.0.0.1
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select lookup(127,0,0,1);
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ERROR HY000: Wrong arguments to lookup; Use the source
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select lookup("localhost");
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lookup("localhost")
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127.0.0.1
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select reverse_lookup();
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ERROR HY000: Wrong number of arguments to reverse_lookup; Use the source
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select reverse_lookup("127.0.0.1");
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select reverse_lookup(127,0,0,1);
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select reverse_lookup("localhost");
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reverse_lookup("localhost")
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NULL
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select avgcost();
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ERROR HY000: wrong number of arguments: AVGCOST() requires two arguments
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select avgcost(100,23.76);
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ERROR HY000: wrong argument type: AVGCOST() requires an INT and a REAL
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create table t1(sum int, price float(24));
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insert into t1 values(100, 50.00), (100, 100.00);
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select avgcost(sum, price) from t1;
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avgcost(sum, price)
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75.0000
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delete from t1;
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insert into t1 values(100, 54.33), (200, 199.99);
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select avgcost(sum, price) from t1;
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avgcost(sum, price)
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151.4367
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drop table t1;
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select metaphon('hello');
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metaphon('hello')
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HL
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CREATE PROCEDURE `XXX1`(in testval varchar(10))
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begin
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select metaphon(testval);
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end//
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call XXX1('hello');
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metaphon(testval)
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HL
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drop procedure xxx1;
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CREATE PROCEDURE `XXX2`()
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begin
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declare testval varchar(10);
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set testval = 'hello';
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select metaphon(testval);
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end//
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call XXX2();
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metaphon(testval)
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HL
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drop procedure xxx2;
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CREATE TABLE bug19904(n INT, v varchar(10));
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INSERT INTO bug19904 VALUES (1,'one'),(2,'two'),(NULL,NULL),(3,'three'),(4,'four');
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SELECT myfunc_double(n) AS f FROM bug19904;
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f
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49.00
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50.00
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NULL
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51.00
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52.00
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SELECT metaphon(v) AS f FROM bug19904;
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f
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ON
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TW
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NULL
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0R
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FR
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DROP TABLE bug19904;
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create table t1(f1 int);
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insert into t1 values(1),(2);
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explain select myfunc_int(f1) from t1 order by 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort
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drop table t1;
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End of 5.0 tests.
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DROP FUNCTION metaphon;
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DROP FUNCTION myfunc_double;
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DROP FUNCTION myfunc_nonexist;
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ERROR 42000: FUNCTION test.myfunc_nonexist does not exist
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DROP FUNCTION myfunc_int;
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DROP FUNCTION sequence;
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DROP FUNCTION lookup;
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DROP FUNCTION reverse_lookup;
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DROP FUNCTION avgcost;
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