Support max_by in Aggregation function

Is your feature request related to a problem or challenge?

Description	Finds the row with the maximum val. Calculates the arg expression at that row. This function is affected by ordering.
Example	max_by(A, B)
Alias(es)	argMax(arg, val), arg_max(arg, val)

Describe the solution you'd like

D SELECT max_by(x, y) FROM VALUES ('a', 10), ('b', 50), ('c', 20) AS tab(x, y);
┌──────────────┐
│ max_by(x, y) │
│   varchar    │
├──────────────┤
│ b            │
└──────────────┘

Describe alternatives you've considered

No response

Additional context

https://duckdb.org/docs/sql/functions/aggregates#max_byarg-val
https://docs.databricks.com/en/sql/language-manual/functions/max_by.html

take

These probably could be an aliases (with some additional transformations) for first/last aggregation functions -- otherwise there it'll end with two implementations of basically the same function (not something bad, but still redundant).

Relevant discussion -- #12075

Given #12357 we may want to move this function to some other repo rather than the core

Suggestion: #12254 (comment)

We are going to implement these in a different repository so closing this ticket to avoid confusion: #12254 (comment)

I'd love to see min_by & max_by within DataFusion repository.

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Support `max_by` in Aggregation function #12252

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Support max_by in Aggregation function #12252

Description

Is your feature request related to a problem or challenge?

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Lordworms commented on Aug 30, 2024

korowa commented on Sep 1, 2024

alamb commented on Sep 9, 2024

alamb commented on Sep 16, 2024

alamb commented on Sep 25, 2024

findepi commented on Jul 16, 2025

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Support `max_by` in Aggregation function #12252