Struct parity_db::ColumnOptions

pub struct ColumnOptions {
    pub preimage: bool,
    pub uniform: bool,
    pub ref_counted: bool,
    pub compression: CompressionType,
    pub compression_threshold: u32,
    pub btree_index: bool,
}

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 counting do not enforce immediate removal and user should not check for missing value.

compression: CompressionType

Compression to use for this column.

compression_threshold: u32

Minimal value size threshold to attempt compressing a value.

btree_index: bool

Column is using a btree indexing.

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<ColumnOptions> 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 StructuralEq for ColumnOptions

impl StructuralPartialEq for ColumnOptions