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use std;
use failure::{
Error,
};
use mentat_core::{
ValueTypeSet,
};
use mentat_query::{
PlainSymbol,
};
use aggregates::{
SimpleAggregationOp,
};
#[macro_export]
macro_rules! bail {
($e:expr) => (
return Err($e.into());
)
}
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug, Fail)]
pub enum ProjectorError {
#[fail(display = "not yet implemented: {}", _0)]
NotYetImplemented(String),
#[fail(display = "no possible types for value provided to {:?}", _0)]
CannotProjectImpossibleBinding(SimpleAggregationOp),
#[fail(display = "cannot apply projection operation {:?} to types {:?}", _0, _1)]
CannotApplyAggregateOperationToTypes(SimpleAggregationOp, ValueTypeSet),
#[fail(display = "invalid projection: {}", _0)]
InvalidProjection(String),
#[fail(display = "cannot project unbound variable {:?}", _0)]
UnboundVariable(PlainSymbol),
#[fail(display = "cannot find type for variable {:?}", _0)]
NoTypeAvailableForVariable(PlainSymbol),
#[fail(display = "expected {}, got {}", _0, _1)]
UnexpectedResultsType(&'static str, &'static str),
#[fail(display = "min/max expressions: {} (max 1), corresponding: {}", _0, _1)]
AmbiguousAggregates(usize, usize),
}