Struct mz_expr::interpret::SpecialUnary

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struct SpecialUnary {
    map_fn: for<'a, 'b> fn(_: &'b ColumnSpecs<'a>, _: ResultSpec<'a>) -> ResultSpec<'a>,
    pushdownable: bool,
}
Expand description

A unary function we’ve added special-case handling for; including:

  • A three-argument function, taking and returning ResultSpecs. This overrides the default function-handling logic entirely.
  • Metadata on whether / not this function is pushdownable. See Trace.

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§map_fn: for<'a, 'b> fn(_: &'b ColumnSpecs<'a>, _: ResultSpec<'a>) -> ResultSpec<'a>§pushdownable: bool

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impl SpecialUnary

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fn for_func(func: &UnaryFunc) -> Option<SpecialUnary>

Returns the special-case handling for a particular function, if it exists.

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