Enum StorageMode 

pub enum StorageMode {
    InMemory,
    ArrowIpc {
        path: PathBuf,
    },
    Parquet {
        path: PathBuf,
    },
}

Storage mode for the DataFusion OLAP engine.

Variants

InMemory

In-memory storage (default). Data is lost on shutdown.

ArrowIpc

Arrow IPC file storage. Zero-overhead native Arrow format.

Data is persisted as .arrow files in path. Survives restarts. No compression — ideal when disk space is not a concern and you want the fastest possible durable writes.

Fields

path: PathBuf

Base directory under which per-table subdirectories are created.

Parquet

Parquet file storage. Compressed columnar with predicate pushdown.

Data is persisted as .parquet files in path. Slower writes than StorageMode::ArrowIpc (Parquet encoding overhead) but much smaller on-disk footprint and enables column/row-group pruning at read time.

Fields

path: PathBuf

Base directory under which per-table subdirectories are created.

Implementations

impl StorageMode

pub fn base_path(&self) -> Option<&PathBuf>

Returns the base path for local file-backed modes, or None for in-memory and cloud modes.

pub fn file_extension(&self) -> &'static str

Returns the file extension for this storage mode.

pub fn is_cloud(&self) -> bool

Returns true if this mode uses cloud object storage.

Trait Implementations

impl Clone for StorageMode

fn clone(&self) -> StorageMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StorageMode

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

Formats the value using the given formatter.

impl Default for StorageMode

fn default() -> StorageMode

Returns the “default value” for a type.