Update arrow requirement from 20 to 21 (#74)

* Update arrow requirement from 20 to 21

Updates the requirements on [arrow](https://github.com/apache/arrow-rs) to permit the latest version.
- [Release notes](https://github.com/apache/arrow-rs/releases)
- [Changelog](https://github.com/apache/arrow-rs/blob/master/CHANGELOG.md)
- [Commits](apache/arrow-rs@20.0.0...21.0.0)

---
updated-dependencies:
- dependency-name: arrow
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* fix error

Change-Id: I4cc904a9c7dc505ec1195c88c33d01577387fbe1

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: wangfenjin <[email protected]>

Cargo.toml

@@ -47,7 +47,7 @@ memchr = "2.3"
 uuid = { version = "1.0", optional = true }
 smallvec = "1.6.1"
 cast = { version = "0.3", features = ["std"] }
-arrow = { version = "20", default-features = false, features = ["prettyprint", "ffi"] }
+arrow = { version = "21", default-features = false, features = ["prettyprint", "ffi"] }
 rust_decimal = "1.14"
 strum = { version = "0.24", features = ["derive"] }
 r2d2 = { version = "0.8.9", optional = true }

libduckdb-sys/Cargo.toml

@@ -28,4 +28,4 @@ cc = { version = "1.0", features = ["parallel"], optional = true }
 vcpkg = { version = "0.2", optional = true }
 
 [dev-dependencies]
-arrow = { version = "20", default-features = false, features = ["ffi"] }
+arrow = { version = "21", default-features = false, features = ["ffi"] }

src/row.rs

@@ -4,7 +4,7 @@ use std::sync::Arc;
 use super::{Error, Result, Statement};
 use crate::types::{self, FromSql, FromSqlError, ValueRef};
 
-use arrow::array::{self, Array, BasicDecimalArray, StructArray};
+use arrow::array::{self, Array, StructArray};
 use arrow::datatypes::*;
 use fallible_iterator::FallibleIterator;
 use fallible_streaming_iterator::FallibleStreamingIterator;