Struct ColumnFamilyMetaDataOptions 

pub struct ColumnFamilyMetaDataOptions { /* private fields */ }

Filters applied when collecting column family metadata.

Both filters narrow which SST files are reported:

• level picks a single LSM level. The default, -1, reports every level.
• start_key and end_key bound a user key range. A file is reported when its key range overlaps the bound, so a file that merely straddles the boundary is included. An unset bound is open-ended on that side.

The filtered query also drops levels that end up with no files, so the resulting Vec<LevelMetaData> is not indexed by level number. Read LevelMetaData::level to find out which level a value describes.

The reported size and file_count cover only the files that passed the filter, not the whole column family.

Implementations

impl ColumnFamilyMetaDataOptions

pub fn new() -> Self

Creates options that filter nothing: all levels, unbounded key range.

pub fn set_level(&mut self, level: i32)

Restricts the query to a single level. Pass -1 to report every level.

pub fn get_level(&self) -> i32

Returns the level filter. -1 means every level.

pub fn set_start_key(&mut self, key: impl AsRef<[u8]>)

Sets the inclusive lower bound of the user key range to report.

pub fn clear_start_key(&mut self)

Removes the lower bound, leaving the range open on that side.

pub fn get_start_key(&self) -> Option<Vec<u8>>

Returns the lower bound, or None if unset.

The C API hands back a borrowed pointer into a std::string owned by the options object, so the bytes are copied here rather than freed.

pub fn set_end_key(&mut self, key: impl AsRef<[u8]>)

Sets the inclusive upper bound of the user key range to report.

pub fn clear_end_key(&mut self)

Removes the upper bound, leaving the range open on that side.

pub fn get_end_key(&self) -> Option<Vec<u8>>

Returns the upper bound, or None if unset.

The C API hands back a borrowed pointer into a std::string owned by the options object, so the bytes are copied here rather than freed.

Trait Implementations

impl Debug for ColumnFamilyMetaDataOptions

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

Formats the value using the given formatter.

impl Default for ColumnFamilyMetaDataOptions

fn default() -> Self

Returns the “default value” for a type.

impl Drop for ColumnFamilyMetaDataOptions

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl Send for ColumnFamilyMetaDataOptions

impl Sync for ColumnFamilyMetaDataOptions