ARROW-6944: [Rust] Add String, FixedSizeBinary types

rust/arrow/Cargo.toml

@@ -48,6 +48,7 @@ lazy_static = "1.2"
 packed_simd = { version = "0.3.1", optional = true }
 chrono = "0.4"
 flatbuffers = "0.6.0"
+hex = "0.4"
 
 [features]
 simd = ["packed_simd"]

rust/arrow/benches/csv_writer.rs

@@ -35,7 +35,7 @@ fn record_batches_to_csv() {
         Field::new("c3", DataType::Boolean, true),
     ]);
 
-    let c1 = BinaryArray::from(vec![
+    let c1 = StringArray::from(vec![
         "Lorem ipsum dolor sit amet",
         "consectetur adipiscing elit",
         "sed do eiusmod tempor",

rust/arrow/examples/builders.rs

@@ -21,8 +21,8 @@ extern crate arrow;
 use std::sync::Arc;
 
 use arrow::array::{
-    Array, ArrayData, BinaryArray, BooleanArray, Int32Array, Int32Builder, ListArray,
-    PrimitiveArray, StructArray,
+    Array, ArrayData, BooleanArray, Int32Array, Int32Builder, ListArray, PrimitiveArray,
+    StringArray, StructArray,
 };
 use arrow::buffer::Buffer;
 use arrow::datatypes::{DataType, Date64Type, Field, Time64NanosecondType, ToByteSlice};
@@ -83,7 +83,7 @@ fn main() {
         .add_buffer(Buffer::from(&values[..]))
         .null_bit_buffer(Buffer::from([0b00000101]))
         .build();
-    let binary_array = BinaryArray::from(array_data);
+    let binary_array = StringArray::from(array_data);
     println!("{:?}", binary_array);
 
     // ListArrays are similar to ByteArrays: they are arrays of other

rust/arrow/examples/dynamic_types.rs

@@ -46,7 +46,7 @@ fn main() -> Result<()> {
     let nested = StructArray::from(vec![
         (
             Field::new("a", DataType::Utf8, false),
-            Arc::new(BinaryArray::from(vec!["a", "b", "c", "d", "e"])) as Arc<dyn Array>,
+            Arc::new(StringArray::from(vec!["a", "b", "c", "d", "e"])) as Arc<dyn Array>,
         ),
         (
             Field::new("b", DataType::Float64, false),

rust/arrow/examples/read_csv.rs

@@ -20,7 +20,7 @@ extern crate arrow;
 use std::fs::File;
 use std::sync::Arc;
 
-use arrow::array::{BinaryArray, Float64Array};
+use arrow::array::{Float64Array, StringArray};
 use arrow::csv;
 use arrow::datatypes::{DataType, Field, Schema};
 
@@ -45,7 +45,7 @@ fn main() {
     let city = batch
         .column(0)
         .as_any()
-        .downcast_ref::<BinaryArray>()
+        .downcast_ref::<StringArray>()
         .unwrap();
     let lat = batch
         .column(1)
@@ -59,11 +59,9 @@ fn main() {
         .unwrap();
 
     for i in 0..batch.num_rows() {
-        let city_name: String = String::from_utf8(city.value(i).to_vec()).unwrap();
-
         println!(
             "City: {}, Latitude: {}, Longitude: {}",
-            city_name,
+            city.value(i),
             lat.value(i),
             lng.value(i)
         );

rust/arrow/examples/read_csv_infer_schema.rs

@@ -17,7 +17,7 @@
 
 extern crate arrow;
 
-use arrow::array::{BinaryArray, Float64Array};
+use arrow::array::{Float64Array, StringArray};
 use arrow::csv;
 use std::fs::File;
 
@@ -40,7 +40,7 @@ fn main() {
     let city = batch
         .column(0)
         .as_any()
-        .downcast_ref::<BinaryArray>()
+        .downcast_ref::<StringArray>()
         .unwrap();
     let lat = batch
         .column(1)
@@ -54,11 +54,9 @@ fn main() {
         .unwrap();
 
     for i in 0..batch.num_rows() {
-        let city_name: String = String::from_utf8(city.value(i).to_vec()).unwrap();
-
         println!(
             "City: {}, Latitude: {}, Longitude: {}",
-            city_name,
+            city.value(i),
             lat.value(i),
             lng.value(i)
         );