Multiples concatenation operator (||)

Hi,

Why "||" operator is not associative ?

select 'A' || 'B' || 'C'; results in a parse error at second "||".

If you force the association, it works: select ('A' || 'B') || 'C';

The same thing happen with mod "%".

It is a problem with the grammer not understanding associativity with
non-standard operators like ||. No good solution for it.

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