add benchmark for map function

datafusion/functions/Cargo.toml

@@ -141,3 +141,7 @@ required-features = ["string_expressions"]
 harness = false
 name = "upper"
 required-features = ["string_expressions"]
+
+[[bench]]
+harness = false
+name = "map"

datafusion/functions/benches/map.rs

@@ -0,0 +1,103 @@
+// 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.
+
+extern crate criterion;
+
+use arrow::array::{Int32Array, ListArray, StringArray};
+use arrow::datatypes::{DataType, Field};
+use arrow_buffer::{OffsetBuffer, ScalarBuffer};
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use datafusion_common::ScalarValue;
+use datafusion_expr::ColumnarValue;
+use datafusion_functions::core::{make_map, map};
+use rand::prelude::ThreadRng;
+use rand::Rng;
+use std::sync::Arc;
+
+fn keys(rng: &mut ThreadRng) -> Vec<String> {
+    let mut keys = vec![];
+    for _ in 0..1000 {
+        keys.push(rng.gen_range(0..9999).to_string());
+    }
+    keys
+}
+
+fn values(rng: &mut ThreadRng) -> Vec<i32> {
+    let mut values = vec![];
+    for _ in 0..1000 {
+        values.push(rng.gen_range(0..9999));
+    }
+    values
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("make_map_1000", |b| {
+        let mut rng = rand::thread_rng();
+        let keys = keys(&mut rng);
+        let values = values(&mut rng);
+        let mut buffer = Vec::new();
+        for i in 0..1000 {
+            buffer.push(ColumnarValue::Scalar(ScalarValue::Utf8(Some(
+                keys[i].clone(),
+            ))));
+            buffer.push(ColumnarValue::Scalar(ScalarValue::Int32(Some(
+                values[i].clone(),
+            ))));
+        }
+
+        b.iter(|| {
+            black_box(
+                make_map()
+                    .invoke(&buffer)
+                    .expect("map should work on valid values"),
+            );
+        });
+    });
+
+    c.bench_function("map_1000", |b| {
+        let mut rng = rand::thread_rng();
+        let field = Arc::new(Field::new("item", DataType::Utf8, true));
+        let offsets = OffsetBuffer::new(ScalarBuffer::from(vec![0, 1000]));
+        let key_list = ListArray::new(
+            field,
+            offsets,
+            Arc::new(StringArray::from(keys(&mut rng))),
+            None,
+        );
+        let field = Arc::new(Field::new("item", DataType::Int32, true));
+        let offsets = OffsetBuffer::new(ScalarBuffer::from(vec![0, 1000]));
+        let value_list = ListArray::new(
+            field,
+            offsets,
+            Arc::new(Int32Array::from(values(&mut rng))),
+            None,
+        );
+        let keys = ColumnarValue::Scalar(ScalarValue::List(Arc::new(key_list)));
+        let values = ColumnarValue::Scalar(ScalarValue::List(Arc::new(value_list)));
+
+        b.iter(|| {
+            black_box(
+                map()
+                    .invoke(&[keys.clone(), values.clone()])
+                    .expect("map should work on valid values"),
+            );
+        });
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);

datafusion/functions/src/core/mod.rs

@@ -88,6 +88,7 @@ pub mod expr_fn {
     ),(
         map,
         "Returns a map created from a key list and a value list",
+        args,
     ));
 
     #[doc = "Returns the value of the field with the given name from the struct"]