Avoid "could not determine interpretation of row comparisonoperator ="

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От Voillequin, Jean-Marc
Тема Avoid "could not determine interpretation of row comparisonoperator ="
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Msg-id 1EC8157EB499BF459A516ADCF135ADCE39FFD3A4@LON-WGMSX712.ad.moodys.net
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Ответы Re: Avoid "could not determine interpretation of row comparison operator ="
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Hello,

 

When I run the following sql:

create or replace function cmp_numeric_text(a numeric, b text) returns boolean as $$ select a=b::numeric;$$ language sql strict immutable;

create operator = (leftarg = numeric, rightarg = text, procedure = cmp_numeric_text);

select 'OK' where (1,2) in (select '1'::text,'2'::text);

 

I get:

ERROR:  could not determine interpretation of row comparison operator =

LINE 1: select 'OK' where (1,2) in (select '1'::text,'2'::text);

                                ^

HINT:  Row comparison operators must be associated with btree operator families.

 

I understand that row (1,2) (int,int) cannot be compared to row (‘1’,’2’) (text,text) without coding a new comparison operator = for row type.

I have read the documentation on “create/alter operator class/family” but could not figure out how to do this.

Is it just possible to implement such feature within PG thanks to operator class/family ?

 

Of course, the case I have to solve is more complex. But a small example or recommendation will be greatly appreciated.

 

Thanks.

Regards.

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