Re: [PERFORM] Views With Unions

[Rajesh Kumar Mallah]

Stephan Szabo wrote:

On Thu, 31 Jul 2003, Christopher Browne wrote:

 

 select * from log_table where request_time between 'june 11 2003' and
                                                  'june 12 2003';

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returns a plan:
Subquery Scan log_table  (cost=0.00..10950.26 rows=177126 width=314)
 ->  Append  (cost=0.00..10950.26 rows=177126 width=314)
       ->  Subquery Scan *SELECT* 1  (cost=0.00..3089.07 rows=50307 width=71)
             ->  Seq Scan on log_table_1  (cost=0.00..3089.07 rows=50307 width=71)
       ->  Subquery Scan *SELECT* 2  (cost=0.00..602.92 rows=9892 width=314)
             ->  Seq Scan on log_table_2  (cost=0.00..602.92 rows=9892 width=314)
       ->  Subquery Scan *SELECT* 3  (cost=0.00..2390.09 rows=39209 width=314)
             ->  Seq Scan on log_table_3  (cost=0.00..2390.09 rows=39209 width=314)
   

What version are you using?  In 7.3 and up it should be willing to
consider moving the clause down, unless there's something like a type
mismatch (because in that case it may not be equivalent without a bunch
more work on the clause).
Dear Chris,

I had the same problem(type mismatch)  and it was  solved finally. 
check the list
"factoring problem ... "  subject only 2 weeks back .

regds
mallah.



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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match
 



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TIP 4: Don't 'kill -9' the postmaster