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use fmt::{Debug, Formatter};
use std::fmt;
use arrow::datatypes::Schema;
use crate::error::Result;
use crate::{logical_plan::Expr, physical_plan::PhysicalExpr};
use super::{
functions::{
ReturnTypeFunction, ScalarFunctionExpr, ScalarFunctionImplementation, Signature,
},
type_coercion::coerce,
};
use std::sync::Arc;
#[derive(Clone)]
pub struct ScalarUDF {
pub name: String,
pub signature: Signature,
pub return_type: ReturnTypeFunction,
pub fun: ScalarFunctionImplementation,
}
impl Debug for ScalarUDF {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.debug_struct("ScalarUDF")
.field("name", &self.name)
.field("signature", &self.signature)
.field("fun", &"<FUNC>")
.finish()
}
}
impl PartialEq for ScalarUDF {
fn eq(&self, other: &Self) -> bool {
self.name == other.name && self.signature == other.signature
}
}
impl ScalarUDF {
pub fn new(
name: &str,
signature: &Signature,
return_type: &ReturnTypeFunction,
fun: &ScalarFunctionImplementation,
) -> Self {
Self {
name: name.to_owned(),
signature: signature.clone(),
return_type: return_type.clone(),
fun: fun.clone(),
}
}
pub fn call(&self, args: Vec<Expr>) -> Expr {
Expr::ScalarUDF {
fun: Arc::new(self.clone()),
args,
}
}
}
pub fn create_physical_expr(
fun: &ScalarUDF,
args: &[Arc<dyn PhysicalExpr>],
input_schema: &Schema,
) -> Result<Arc<dyn PhysicalExpr>> {
let args = coerce(args, input_schema, &fun.signature)?;
let arg_types = args
.iter()
.map(|e| e.data_type(input_schema))
.collect::<Result<Vec<_>>>()?;
Ok(Arc::new(ScalarFunctionExpr::new(
&fun.name,
fun.fun.clone(),
args,
(fun.return_type)(&arg_types)?.as_ref(),
)))
}