|From:||Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>|
|Subject:||Non-trivial rewriting sql query|
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we're thinking about possibility to integrate our full-text search
into postgres. There are several problems we should thinking about
but for now we have a question about rewrite system.
Is't possible to rewrite SQL query and execute it. Currently we build
sql query outside of postgres using perl.
Let's consider some simple example:
create table tst ( a int4, b int4, c int4);
select * from tst where a=2 and c=0;
we need something like:
select * from tst where str and c=0;
where str is a string resulting by call ourfunc(table.a, 2)
and looks like 'b=2*2 or b=(2-1)'
i.e. instead of original select we need to execute rewritten select
select * from tst where (b=2*2 or b=(2-1)) and c=0;
in other words we need to know is't possible to recognise
(operator, field,table) and rewrite part of sql by
result of calling of ourfunc().
We're not sure if it's a question of rewrite system though.
Any pointers where to go would be very nice.
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