Jim Nasby wrote:
> As a less invasive alternative, I *think* you could create an SQL
> function for casting text to int that treated '' as 0, and then
> replace the built-in CAST with that.

Won't work.  You need to replace the data type input function.

-- 
Peter Eisentraut
http://developer.postgresql.org/~petere/

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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