rust/core/src/lib.rs

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//! ADBC: Arrow Database Connectivity
//!
//! ADBC is a set of APIs and libraries for [Arrow](https://arrow.apache.org/)-native
//! access to databases. Execute SQL and [Substrait](https://substrait.io/)
//! queries, query database catalogs, and more, all using Arrow data to
//! eliminate unnecessary data copies, speed up access, and make it more
//! convenient to build analytical applications.
//!
//! Read more about ADBC at <https://arrow.apache.org/adbc/>
//!
//! The `core` library currently provides the basic types shared by vendor-specific drivers,
//! the driver manager, and the driver exporter.
//!
//! # Native Rust drivers
//!
//! Native Rust drivers will implement the abstract API consisting of the traits:
//! - [Driver]
//! - [Database]
//! - [Connection]
//! - [Statement]
//!
//! For drivers implemented in Rust, using these will be more efficient and
//! safe, since it avoids the overhead of going through C FFI.

pub mod constants;
pub mod error;
pub mod options;
pub mod schemas;
pub mod sync;

pub use sync::*;

use arrow_schema::Schema;

pub type LoadFlags = u32;

pub const LOAD_FLAG_SEARCH_ENV: LoadFlags = 1 << 1;
pub const LOAD_FLAG_SEARCH_USER: LoadFlags = 1 << 2;
pub const LOAD_FLAG_SEARCH_SYSTEM: LoadFlags = 1 << 3;
pub const LOAD_FLAG_ALLOW_RELATIVE_PATHS: LoadFlags = 1 << 4;
pub const LOAD_FLAG_DEFAULT: LoadFlags = LOAD_FLAG_SEARCH_ENV
    | LOAD_FLAG_SEARCH_USER
    | LOAD_FLAG_SEARCH_SYSTEM
    | LOAD_FLAG_ALLOW_RELATIVE_PATHS;

/// Each data partition is described by an opaque byte array and can be
/// retrieved with [Connection::read_partition].
pub type Partitions = Vec<Vec<u8>>;

/// A partitioned result set as returned by [Statement::execute_partitions].
#[derive(Debug, PartialEq, Eq)]
pub struct PartitionedResult {
    /// The result partitions.
    pub partitions: Partitions,
    /// The schema of the result set.
    pub schema: Schema,
    /// The number of rows affected if known, else -1.
    pub rows_affected: i64,
}