feature gate csv functionality

arrow/Cargo.toml

@@ -41,8 +41,9 @@ serde_derive = "1.0"
 serde_json = { version = "1.0", features = ["preserve_order"] }
 indexmap = "1.6"
 rand = "0.7"
-csv = "1.1"
 num = "0.4"
+csv_crate = { version = "1.1", optional = true, package="csv" }
+num = "0.3"
 regex = "1.3"
 lazy_static = "1.4"
 packed_simd = { version = "0.3.4", optional = true, package = "packed_simd_2" }
@@ -54,8 +55,9 @@ lexical-core = "^0.7"
 multiversion = "0.6.1"
 
 [features]
-default = []
+default = ["csv"]
 avx512 = []
+csv = ["csv_crate"]
 simd = ["packed_simd"]
 prettyprint = ["prettytable-rs"]
 # this is only intended to be used in single-threaded programs: it verifies that

arrow/src/csv/reader.rs

@@ -49,7 +49,7 @@ use std::fs::File;
 use std::io::{Read, Seek, SeekFrom};
 use std::sync::Arc;
 
-use csv as csv_crate;
+use csv_crate;
 
 use crate::array::{
     ArrayRef, BooleanArray, DictionaryArray, PrimitiveArray, StringArray,

arrow/src/csv/writer.rs

@@ -65,7 +65,7 @@
 //! }
 //! ```
 
-use csv as csv_crate;
+use csv_crate;
 
 use std::io::Write;
 

arrow/src/error.rs

@@ -19,7 +19,8 @@
 use std::fmt::{Debug, Display, Formatter};
 use std::io::Write;
 
-use csv as csv_crate;
+#[cfg(feature = "csv")]
+use csv_crate;
 use std::error::Error;
 
 /// Many different operations in the `arrow` crate return this error type.
@@ -59,6 +60,7 @@ impl From<::std::io::Error> for ArrowError {
     }
 }
 
+#[cfg(feature = "csv")]
 impl From<csv_crate::Error> for ArrowError {
     fn from(error: csv_crate::Error) -> Self {
         match error.kind() {

arrow/src/lib.rs

@@ -149,6 +149,7 @@ pub mod bitmap;
 pub mod buffer;
 mod bytes;
 pub mod compute;
+#[cfg(feature = "csv")]
 pub mod csv;
 pub mod datatypes;
 pub mod error;