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Add function to create spoly from an array of numbers in radians#96

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@esabol
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As discussed in issue#95, this pull request adds a constructor function to create an spoly from an array of numbers in radians. It is very similar to spoly_deg() except without the calls todeg_to_rad().

Question 1: Can the spoly(float8[]) function be marked PARALLEL SAFE? My reading of the documentation for PARALLEL SAFE doesn't mention anything about accessing arrays or allocating memory, so I think it should be.

Question 2: Can it be marked STRICT?select spoly(NULL::float8[]) returns null, I believe.

If the answer to either or both questions, I would like to make the same change(s) tospoly_deg also.

@df7cb
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I believe the answer to both question is "yes".

Mind that besides the parameter being NULL, individual array elements might also be NULL.

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@vitcpp
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@esabol I think, everything ok except of some trivial formatting changes. Thank you!

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@vitcpp
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@esabol I'm ok to accept the patch. Could you please squash the commits?

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@esabolesabolforce-pushed theadd-spoly-array-constructor branch from2cbb5b0 to0fcfa36CompareNovember 1, 2023 20:04
@esabol
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Rebased and squashed. Ready to merge whenever you are. Thank you for your reviews,@vitcpp !

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@vitcpp
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It seems I'm the only reviewer. Lets merge it, since the risks to break the pgpshere are minimal.

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@vitcppvitcpp merged commit81939cf intopostgrespro:masterNov 3, 2023
@esabolesabol deleted the add-spoly-array-constructor branchNovember 3, 2023 06:02
@vitcppvitcpp mentioned this pull requestNov 7, 2023
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@esabol@df7cb@vitcpp
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