Re: possible wierd boolean bug?

That is bizarre. Does EXPLAIN show any difference?

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Merlin Moncure wrote:
> I have a strange but reproducible problem where a query does not seem to
> return the same results.
> 
> esp=# select 1::int4, * from data1.po_line_file
> esp-#   where pol_po_no =  '00000002' and
> esp-#           (pol_po_no =  '00000002' and pol_po_rel_no =  0) and
> esp-#           (pol_po_no =  '00000002' and pol_po_rel_no =  0 and
> pol_item_no =  '1570')
> esp-#   limit 1 ;
> [fields omitted]
> (0 rows)
> 
> esp=# select 1::int4, * from data1.po_line_file
> esp-#   where --pol_po_no =  '00000002' and
> esp-#           --(pol_po_no =  '00000002' and pol_po_rel_no =  0) and
> esp-#           (pol_po_no =  '00000002' and pol_po_rel_no =  0 and
> pol_item_no =  '1570')
> esp-#   limit 1 ;
> [fields omitted, note commented redundant clauses]
> (1 row)
> 
> The obviously silly Boolean clause here was sql that was generated by a
> driver.  I recoded the driver to make more intelligent sql and now the
> problem is gone, at least from my application.  Note that the same query
> form but with different tables/fields works correctly 99.99999% of the
> time, just not this time...I'm just curious as to how two seemingly
> equivalent statements could produce different results...perhpaps I
> missed something?
> 
> Merlin
> 
> 
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