Hi,
I have Linux, PostgreSQL 8.1, Python 2.3
pgsql code:
test=# create table t1(name varchar(10), value integer);
CREATE TABLE
test=# create or replace function f1(integer) returns integer as $$
test$# file = open('/tmp/f1.log', 'a')
test$# file.write('log\n')
test$# file.close
test$# return args[0]+1
test$# $$ language plpythonu immutable;
CREATE FUNCTION
test=# select name, f1(value) from t1;
name | f1
------+----
r1 | 2
r2 | 3
(records: 2)
$ cat /tmp/f1.log
log
log
After creating index:
test=# create index i1 on t1 (f1(value));
CREATE INDEX
$ cat /tmp/f1.log
log
log
log
log
After select:
test=# select name, f1(value) from t1;
name | f1
------+----
r1 | 2
r2 | 3
(records: 2)
$ cat /tmp/f1.log
log
log
log
log
log
log
Why f1 was called in last case? Why select can't use index values
instead of function call results? Is it bug? Can it be configured?
--
Thanks,
Eugene Prokopiev
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