From 020906aede1bea48068b149e16ac6699868d607d Mon Sep 17 00:00:00 2001
From: Neville Dipale <nevilledips@gmail.com>
Date: Wed, 6 Mar 2019 05:19:04 +0200
Subject: [PATCH] move cast_kernels > kernels/cast

---
 .../{cast_kernels.rs => kernels/cast.rs}      | 30 ++++++++-----------
 rust/arrow/src/compute/kernels/mod.rs         | 20 +++++++++++++
 rust/arrow/src/compute/mod.rs                 |  4 +--
 3 files changed, 35 insertions(+), 19 deletions(-)
 rename rust/arrow/src/compute/{cast_kernels.rs => kernels/cast.rs} (97%)
 create mode 100644 rust/arrow/src/compute/kernels/mod.rs

diff --git a/rust/arrow/src/compute/cast_kernels.rs b/rust/arrow/src/compute/kernels/cast.rs
similarity index 97%
rename from rust/arrow/src/compute/cast_kernels.rs
rename to rust/arrow/src/compute/kernels/cast.rs
index ec261bfa2fdff..a25af0296f173 100644
--- a/rust/arrow/src/compute/cast_kernels.rs
+++ b/rust/arrow/src/compute/kernels/cast.rs
@@ -15,23 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-//! Defines cast kernels for `ArrayRef`.
-//!
-//! Allows casting arrays between supported datatypes.
-//!
-//! ## Behavior
-//!
-//! * Boolean to Utf8: `true` => '1', `false` => `0`
-//! * Utf8 to numeric: strings that can't be parsed to numbers return null, float strings
-//!   in integer casts return null
-//! * Numeric to boolean: 0 returns `false`, any other value returns `true`
-//!
-//! ## Unsupported Casts
-//!
-//! * To or from `StructArray`
-//! * To or from `ListArray`
-//! * Boolean to float
-//! * Utf8 to boolean
+//! Defines cast kernels for `ArrayRef`, allowing casting arrays between supported datatypes.
 //!
 //! Example:
 //!
@@ -123,6 +107,18 @@ macro_rules! cast_bool_to_numeric {
 }
 
 /// Cast array to provided data type
+///
+/// Behavior:
+/// * Boolean to Utf8: `true` => '1', `false` => `0`
+/// * Utf8 to numeric: strings that can't be parsed to numbers return null, float strings
+///   in integer casts return null
+/// * Numeric to boolean: 0 returns `false`, any other value returns `true`
+///
+/// Unsupported Casts
+/// * To or from `StructArray`
+/// * To or from `ListArray`
+/// * Boolean to float
+/// * Utf8 to boolean
 pub fn cast(array: &ArrayRef, to_type: &DataType) -> Result<ArrayRef> {
     use DataType::*;
     let from_type = array.data_type();
diff --git a/rust/arrow/src/compute/kernels/mod.rs b/rust/arrow/src/compute/kernels/mod.rs
new file mode 100644
index 0000000000000..fc5ef0da3a282
--- /dev/null
+++ b/rust/arrow/src/compute/kernels/mod.rs
@@ -0,0 +1,20 @@
+// 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.
+
+//! Computation kernels on Arrow Arrays
+
+pub mod cast;
diff --git a/rust/arrow/src/compute/mod.rs b/rust/arrow/src/compute/mod.rs
index 8a06b19ad31cd..7e17eed86e243 100644
--- a/rust/arrow/src/compute/mod.rs
+++ b/rust/arrow/src/compute/mod.rs
@@ -20,13 +20,13 @@
 pub mod arithmetic_kernels;
 pub mod array_ops;
 pub mod boolean_kernels;
-pub mod cast_kernels;
 pub mod comparison_kernels;
+pub mod kernels;
 
 mod util;
 
 pub use self::arithmetic_kernels::*;
 pub use self::array_ops::*;
 pub use self::boolean_kernels::*;
-pub use self::cast_kernels::*;
 pub use self::comparison_kernels::*;
+pub use self::kernels::cast::*;