datafusion-spark 53.1.0

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use arrow::array::ArrayRef;
use arrow::compute::like;
use arrow::datatypes::{DataType, Field, FieldRef};
use datafusion_common::{Result, exec_err, internal_err};
use datafusion_expr::ColumnarValue;
use datafusion_expr::{
    ReturnFieldArgs, ScalarFunctionArgs, ScalarUDFImpl, Signature, Volatility,
};
use datafusion_functions::utils::make_scalar_function;
use std::any::Any;
use std::sync::Arc;

/// LIKE function for case-sensitive pattern matching
/// <https://spark.apache.org/docs/latest/api/sql/index.html#like>
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct SparkLike {
    signature: Signature,
}

impl Default for SparkLike {
    fn default() -> Self {
        Self::new()
    }
}

impl SparkLike {
    pub fn new() -> Self {
        Self {
            signature: Signature::string(2, Volatility::Immutable),
        }
    }
}

impl ScalarUDFImpl for SparkLike {
    fn as_any(&self) -> &dyn Any {
        self
    }

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

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

    fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
        internal_err!("return_field_from_args should be used instead")
    }

    fn return_field_from_args(&self, args: ReturnFieldArgs) -> Result<FieldRef> {
        let nullable = args.arg_fields.iter().any(|f| f.is_nullable());
        Ok(Arc::new(Field::new(
            self.name(),
            DataType::Boolean,
            nullable,
        )))
    }

    fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue> {
        make_scalar_function(spark_like, vec![])(&args.args)
    }
}

/// Returns true if str matches pattern (case sensitive).
pub fn spark_like(args: &[ArrayRef]) -> Result<ArrayRef> {
    if args.len() != 2 {
        return exec_err!("like function requires exactly 2 arguments");
    }

    let result = like(&args[0], &args[1])?;
    Ok(Arc::new(result))
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::function::utils::test::test_scalar_function;
    use arrow::array::{Array, BooleanArray};
    use arrow::datatypes::{DataType::Boolean, Field};
    use datafusion_common::{Result, ScalarValue};
    use datafusion_expr::{ColumnarValue, ReturnFieldArgs, ScalarUDFImpl};

    macro_rules! test_like_string_invoke {
        ($INPUT1:expr, $INPUT2:expr, $EXPECTED:expr) => {
            test_scalar_function!(
                SparkLike::new(),
                vec![
                    ColumnarValue::Scalar(ScalarValue::Utf8($INPUT1)),
                    ColumnarValue::Scalar(ScalarValue::Utf8($INPUT2))
                ],
                $EXPECTED,
                bool,
                Boolean,
                BooleanArray
            );

            test_scalar_function!(
                SparkLike::new(),
                vec![
                    ColumnarValue::Scalar(ScalarValue::LargeUtf8($INPUT1)),
                    ColumnarValue::Scalar(ScalarValue::LargeUtf8($INPUT2))
                ],
                $EXPECTED,
                bool,
                Boolean,
                BooleanArray
            );

            test_scalar_function!(
                SparkLike::new(),
                vec![
                    ColumnarValue::Scalar(ScalarValue::Utf8View($INPUT1)),
                    ColumnarValue::Scalar(ScalarValue::Utf8View($INPUT2))
                ],
                $EXPECTED,
                bool,
                Boolean,
                BooleanArray
            );
        };
    }

    #[test]
    fn test_like_invoke() -> Result<()> {
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("_park")),
            Ok(Some(true))
        );
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("_PARK")),
            Ok(Some(false)) // case-sensitive
        );
        test_like_string_invoke!(
            Some(String::from("SPARK")),
            Some(String::from("_park")),
            Ok(Some(false)) // case-sensitive
        );
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("Sp%")),
            Ok(Some(true))
        );
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("SP%")),
            Ok(Some(false)) // case-sensitive
        );
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("%ark")),
            Ok(Some(true))
        );
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("%ARK")),
            Ok(Some(false)) // case-sensitive
        );
        test_like_string_invoke!(
            Some(String::from("Spark")),
            Some(String::from("xyz")),
            Ok(Some(false))
        );
        test_like_string_invoke!(None, Some(String::from("_park")), Ok(None));
        test_like_string_invoke!(Some(String::from("Spark")), None, Ok(None));
        test_like_string_invoke!(None, None, Ok(None));

        Ok(())
    }

    #[test]
    fn test_like_nullability() {
        let like = SparkLike::new();

        // Test with non-nullable arguments
        let non_nullable_field1 = Arc::new(Field::new("str", DataType::Utf8, false));
        let non_nullable_field2 = Arc::new(Field::new("pattern", DataType::Utf8, false));

        let both_non_nullable = like
            .return_field_from_args(ReturnFieldArgs {
                arg_fields: &[
                    Arc::clone(&non_nullable_field1),
                    Arc::clone(&non_nullable_field2),
                ],
                scalar_arguments: &[None, None],
            })
            .unwrap();

        // The result should not be nullable when both inputs are non-nullable
        assert!(!both_non_nullable.is_nullable());
        assert_eq!(both_non_nullable.data_type(), &Boolean);

        // Test with first argument nullable
        let nullable_field1 = Arc::new(Field::new("str", DataType::Utf8, true));

        let first_nullable = like
            .return_field_from_args(ReturnFieldArgs {
                arg_fields: &[
                    Arc::clone(&nullable_field1),
                    Arc::clone(&non_nullable_field2),
                ],
                scalar_arguments: &[None, None],
            })
            .unwrap();

        // The result should be nullable when first input is nullable
        assert!(first_nullable.is_nullable());
        assert_eq!(first_nullable.data_type(), &Boolean);

        // Test with second argument nullable
        let nullable_field2 = Arc::new(Field::new("pattern", DataType::Utf8, true));

        let second_nullable = like
            .return_field_from_args(ReturnFieldArgs {
                arg_fields: &[
                    Arc::clone(&non_nullable_field1),
                    Arc::clone(&nullable_field2),
                ],
                scalar_arguments: &[None, None],
            })
            .unwrap();

        // The result should be nullable when second input is nullable
        assert!(second_nullable.is_nullable());
        assert_eq!(second_nullable.data_type(), &Boolean);

        // Test with both arguments nullable
        let first_second_nullable = like
            .return_field_from_args(ReturnFieldArgs {
                arg_fields: &[Arc::clone(&nullable_field1), Arc::clone(&nullable_field2)],
                scalar_arguments: &[None, None],
            })
            .unwrap();

        // The result should be nullable when both inputs are nullable
        assert!(first_second_nullable.is_nullable());
        assert_eq!(first_second_nullable.data_type(), &Boolean);
    }
}