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Max()/Min() over a text column is a sort, and the engines sort text
differently: MariaDB's utf8mb4 collations fold case, PostgreSQL as CI runs it
orders by byte value. MAX('abc','ABD') is 'ABD' on MariaDB and 'abc' on
PostgreSQL, confirmed on CI in the probe attached to #56241.
That makes a Max() over a text column which varies in case within its group a
live parity gap, rather than the arbitrary-pick preservation the wrap is
usually justified as. Where the column is functionally dependent on the group
key it stays a genuine no-op and collation cannot matter, so the rule is
scoped to non-FD columns to keep it a high-precision signal.
Recorded as a fifth second-order trap in the guide and in the Greptile
instructions, including the trap that a local macOS PostgreSQL agrees with
MariaDB here and reports a false all-clear.
