datafusion-physical-expr 14.0.0

Physical expression implementation for DataFusion query engine
Documentation 
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// 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.

//! This module contains functions that change types or names of other
//! kernels to make them compatible with the main dispatch logic

use std::sync::Arc;

use super::kernels_arrow::*;
use arrow::array::*;
use arrow::datatypes::DataType;
use datafusion_common::Result;

/// create a `dyn_op` wrapper function for the specified operation
/// that call the underlying dyn_op arrow kernel if the type is
/// supported, and translates ArrowError to DataFusionError
macro_rules! make_dyn_comp_op {
    ($OP:tt) => {
        paste::paste! {
            /// wrapper over arrow compute kernel that maps Error types and
            /// patches missing support in arrow
            pub(crate) fn [<$OP _dyn>] (left: &dyn Array, right: &dyn Array) -> Result<ArrayRef> {
                match (left.data_type(), right.data_type()) {
                    // Call `op_decimal` (e.g. `eq_decimal) until
                    // arrow has native support
                    // https://github.com/apache/arrow-rs/issues/1200
                    (DataType::Decimal128(_, _), DataType::Decimal128(_, _)) => {
                        [<$OP _decimal>](as_decimal_array(left), as_decimal_array(right))
                    },
                    // By default call the arrow kernel
                    _ => {
                    arrow::compute::kernels::comparison::[<$OP _dyn>](left, right)
                            .map_err(|e| e.into())
                    }
                }
                .map(|a| Arc::new(a) as ArrayRef)
            }
        }
    };
}

// create eq_dyn, gt_dyn, wrappers etc
make_dyn_comp_op!(eq);
make_dyn_comp_op!(gt);
make_dyn_comp_op!(gt_eq);
make_dyn_comp_op!(lt);
make_dyn_comp_op!(lt_eq);
make_dyn_comp_op!(neq);