How can I assign a multiple-field-function result on PostgreSQL updates -


i'm looking optimized method in postgresql that:

update table1 set (a,b)=(somecomplexfunction(table1.something),2*somecomplexfunction(table1.something))  ...

this calculates somecomplexfunction(table1.something) twice, i'd that:

update table1 set (a,b)=somecomplexvectorfunction(table1.something) ...

but update syntax not support multiple field functions. ideas?

update table1 set     = somecomplexfunction(table1.something),     b = * 2 ...

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