Struct FFI_SessionConfig 

#[repr(C)]
pub struct FFI_SessionConfig {
    pub config_options: unsafe extern "C" fn(config: &Self) -> RHashMap<RString, RString>,
    pub clone: unsafe extern "C" fn(plan: &Self) -> Self,
    pub release: unsafe extern "C" fn(arg: &mut Self),
    pub private_data: *mut c_void,
}

A stable struct for sharing SessionConfig across FFI boundaries. Instead of attempting to expose the entire SessionConfig interface, we convert the config options into a map from a string to string and pass those values across the FFI boundary. On the receiver side, we reconstruct a SessionConfig from those values.

It is possible that using different versions of DataFusion across the FFI boundary could have differing expectations of the config options. This is a limitation of this approach, but exposing the entire SessionConfig via a FFI interface would be extensive and provide limited value over this version.

Fields

config_options: unsafe extern "C" fn(config: &Self) -> RHashMap<RString, RString>

Return a hash map from key to value of the config options represented by string values.

clone: unsafe extern "C" fn(plan: &Self) -> Self

Used to create a clone on the provider of the execution plan. This should only need to be called by the receiver of the plan.

release: unsafe extern "C" fn(arg: &mut Self)

Release the memory of the private data when it is no longer being used.

private_data: *mut c_void

Internal data. This is only to be accessed by the provider of the plan. A ForeignSessionConfig should never attempt to access this data.

Trait Implementations

impl Clone for FFI_SessionConfig

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FFI_SessionConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for FFI_SessionConfig

fn drop(&mut self)

Executes the destructor for this type.

impl From<&SessionConfig> for FFI_SessionConfig

fn from(session: &SessionConfig) -> Self

Converts to this type from the input type.

impl GetStaticEquivalent_ for FFI_SessionConfig

type StaticEquivalent = _static_FFI_SessionConfig

The 'static equivalent of Self

impl StableAbi for FFI_SessionConfig

const LAYOUT: &'static TypeLayout

The layout of the type provided by implementors.

type IsNonZeroType = False

Whether this type has a single invalid bit-pattern.

const ABI_CONSTS: AbiConsts = _

const-equivalents of the associated types.

impl TryFrom<&FFI_SessionConfig> for ForeignSessionConfig

type Error = DataFusionError

The type returned in the event of a conversion error.

fn try_from(config: &FFI_SessionConfig) -> Result<Self, Self::Error>

Performs the conversion.

impl Send for FFI_SessionConfig

impl Sync for FFI_SessionConfig