Use Parser for cast kernel (#4512) (#4513)

* Use Parser for cast kernel (#4512)

* Support parsing unpadded dates

* Review feedback

* Tweak bound

arrow-cast/Cargo.toml

@@ -65,6 +65,10 @@ harness = false
 name = "parse_time"
 harness = false
 
+[[bench]]
+name = "parse_date"
+harness = false
+
 [[bench]]
 name = "parse_decimal"
 harness = false

arrow-cast/benches/parse_date.rs

@@ -0,0 +1,34 @@
+// 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.
+
+use arrow_array::types::Date32Type;
+use arrow_cast::parse::Parser;
+use criterion::*;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let timestamps = ["2020-09-08", "2020-9-8", "2020-09-8", "2020-9-08"];
+
+    for timestamp in timestamps {
+        let t = black_box(timestamp);
+        c.bench_function(t, |b| {
+            b.iter(|| Date32Type::parse(t).unwrap());
+        });
+    }
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);