datafusion-functions 37.0.0

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//   http://www.apache.org/licenses/LICENSE-2.0
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//! "crypto" DataFusion functions
use crate::crypto::basic::md5;
use arrow::datatypes::DataType;
use datafusion_common::{plan_err, Result};
use datafusion_expr::{ColumnarValue, ScalarUDFImpl, Signature, Volatility};
use std::any::Any;

#[derive(Debug)]
pub(super) struct Md5Func {
    signature: Signature,
}
impl Md5Func {
    pub fn new() -> Self {
        use DataType::*;
        Self {
            signature: Signature::uniform(
                1,
                vec![Utf8, LargeUtf8, Binary, LargeBinary],
                Volatility::Immutable,
            ),
        }
    }
}
impl ScalarUDFImpl for Md5Func {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn name(&self) -> &str {
        "md5"
    }

    fn signature(&self) -> &Signature {
        &self.signature
    }

    fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
        use DataType::*;
        Ok(match &arg_types[0] {
            LargeUtf8 | LargeBinary => LargeUtf8,
            Utf8 | Binary => Utf8,
            Null => Null,
            Dictionary(_, t) => match **t {
                LargeUtf8 | LargeBinary => LargeUtf8,
                Utf8 | Binary => Utf8,
                Null => Null,
                _ => {
                    return plan_err!(
                        "the md5 can only accept strings but got {:?}",
                        **t
                    );
                }
            },
            other => {
                return plan_err!(
                    "The md5 function can only accept strings. Got {other}"
                );
            }
        })
    }
    fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> {
        md5(args)
    }
}