Re: [HACKERS] Surjective functional indexes

Re: Konstantin Knizhnik 2017-09-01 <f530ede0-1bf6-879c-c362-34325514f692@postgrespro.ru>
> +       Functional index is based on on projection function: function which extract subset of its argument.
> +       In mathematic such functions are called non-injective. For injective function if any attribute used in the
indexed
> +       expression is changed, then value of index expression is also changed.

This is Just Wrong. I still think what you are doing here doesn't have
anything to do with the function being injective or not.

Christoph


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