Function sql::plan::typeconv::plan_hypothetical_cast [−][src]
pub fn plan_hypothetical_cast(
ecx: &ExprContext<'_>,
ccx: CastContext,
from: &ScalarType,
to: &ScalarType
) -> Option<MirScalarExpr>
Expand description
Similar to plan_cast
, but for situations where you only know the type of
the input expression (from
) and not the expression itself. The returned
expression refers to the first column of some imaginary row, where the first
column is assumed to have type from
.
If casting from from
to to
is not possible, returns None
.