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FirstColumn

mz_expr::scalar::func::impls::try_cast

Struct FirstColumn 

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struct FirstColumn;
Expand description

Evaluates to the first column of the row it is given.

TryCast::eval needs to hand an already evaluated datum to inner, but LazyUnaryFunc::eval takes the argument as an &'a impl Eval and returns a Datum<'a>, so a value constructed inside eval cannot serve as the argument. Instead the datum becomes a one-column row and this 'static reader stands in for the argument, mirroring how the element casts of CastList1ToList2 evaluate against a one-column row.

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impl Eval for FirstColumn

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fn eval<'a>( &'a self, datums: &[Datum<'a>], _temp_storage: &'a RowArena, ) -> Result<Datum<'a>, EvalError>

Evaluates, where datums are column references and temp_storage is used for allocation. Read more
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fn could_error(&self) -> bool

True iff evaluation could possibly error on non-error input Datum.

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