Re: Fixing set-returning functions are not allowed in UPDATE after upgrade to Postgres 12

[Laurenz Albe <laurenz.albe@xxxxxxxxxxx>]

On Thu, 2020-04-02 at 17:48 +0300, Andrus wrote:
> After upgrading to Postgres 12   statement
> 
> update temprid set
>     ContactFirstName =unnest(xpath(
>          '/E-Document/Document/DocumentParties/BuyerParty/ContactData/ContactFirstName/text()',x))::text,
>     yhik =unnest(xpath(
>          '/E-Document/Document/DocumentItem/ItemEntry/BaseUnit/text()',x))::text
>          from t
> 
> throws error
> 
> set-returning functions are not allowed in UPDATE
> 
> How to fix this ?

Simply replace

   SET col = unnest(array_value)

with

   SET col = array_value[1]

Yours,
Laurenz Albe
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