ASF GitHub Bot commented on ARROW-2408:

xhochy closed pull request #1847: ARROW-2408: [Rust] Remove build warnings
URL: https://github.com/apache/arrow/pull/1847

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diff --git a/ci/travis_script_rust.sh b/ci/travis_script_rust.sh
index 4405d036d..6a8ecf081 100755
--- a/ci/travis_script_rust.sh
+++ b/ci/travis_script_rust.sh
@@ -23,8 +23,12 @@ RUST_DIR=${TRAVIS_BUILD_DIR}/rust
 pushd $RUST_DIR
+# raises on any formatting errors
 rustup component add rustfmt-preview
 cargo fmt --all -- --write-mode=diff
+# raises on any warnings
+cargo rustc -- -D warnings 
 cargo build
 cargo test
diff --git a/rust/examples/array_from_builder.rs 
index 3a273a64d..ea1ecec45 100644
--- a/rust/examples/array_from_builder.rs
+++ b/rust/examples/array_from_builder.rs
@@ -18,7 +18,6 @@
 extern crate arrow;
 use arrow::array::*;
-use arrow::buffer::*;
 use arrow::builder::*;
 fn main() {
diff --git a/rust/src/buffer.rs b/rust/src/buffer.rs
index ab90a5b08..1f2ec6c8d 100644
--- a/rust/src/buffer.rs
+++ b/rust/src/buffer.rs
@@ -18,7 +18,6 @@
 use bytes::Bytes;
 use libc;
 use std::mem;
-use std::ptr;
 use std::slice;
 use super::memory::*;
diff --git a/rust/src/builder.rs b/rust/src/builder.rs
index 1cc024042..c8ba27477 100644
--- a/rust/src/builder.rs
+++ b/rust/src/builder.rs
@@ -15,11 +15,9 @@
 // specific language governing permissions and limitations
 // under the License.
-use bytes::Bytes;
 use libc;
 use std::mem;
 use std::ptr;
-use std::slice;
 use super::buffer::*;
 use super::memory::*;
diff --git a/rust/src/datatypes.rs b/rust/src/datatypes.rs
index 85278f7bb..ac2c2c6ea 100644
--- a/rust/src/datatypes.rs
+++ b/rust/src/datatypes.rs
@@ -16,7 +16,6 @@
 // under the License.
 use super::error::ArrowError;
-use serde_json;
 use serde_json::Value;
 use std::fmt;
@@ -241,6 +240,7 @@ impl fmt::Display for Schema {
 mod tests {
     use super::*;
+    use serde_json;
     fn create_struct_type() {


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> [Rust] It should be possible to get a &mut[T] from Builder<T>
> -------------------------------------------------------------
>                 Key: ARROW-2408
>                 URL: https://issues.apache.org/jira/browse/ARROW-2408
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Rust
>            Reporter: Andy Grove
>            Assignee: Andy Grove
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.10.0
> I am currently adding Arrow support to the parquet-rs crate and I found a 
> need to get a mutable slice from a Buffer<T> to pass to the parquet column 
> reader methods.

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