Struct parity_db::ColumnOptions

pub struct ColumnOptions {
    pub preimage: bool,
    pub uniform: bool,
    pub ref_counted: bool,
    pub compression: CompressionType,
    pub btree_index: bool,
}

Database column configuration.

Fields

preimage: bool

Indicates that the column value is the preimage of the key. This implies that a given value always has the same key. Enables some optimizations.

uniform: bool

Indicates that the keys are at least 32 bytes and the first 32 bytes have uniform distribution. Allows for skipping additional key hashing.

ref_counted: bool

Use reference counting for values. Reference operations are allowed for a column. The value is deleted when the counter reaches zero.

compression: CompressionType

Compression to use for this column.

btree_index: bool

Column is configured to use Btree storage. Btree columns allow for ordered key iteration and key retrieval, but are significantly less performant and require more disk space.

Implementations

impl ColumnOptions

pub fn is_valid(&self) -> bool

Trait Implementations

impl Clone for ColumnOptions

fn clone(&self) -> ColumnOptions

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnOptions

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

Formats the value using the given formatter.

impl Default for ColumnOptions

fn default() -> ColumnOptions

Returns the “default value” for a type.

impl PartialEq for ColumnOptions

fn eq(&self, other: &ColumnOptions) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ColumnOptions

impl StructuralPartialEq for ColumnOptions