Struct ColumnFamilyStats

pub struct ColumnFamilyStats {
    pub average_cells_per_column: Option<f64>,
    pub average_columns_per_row: Option<f64>,
    pub logical_data_bytes: Option<i64>,
}

Approximate statistics related to a single column family within a table. This information may change rapidly, interpreting these values at a point in time may already preset out-of-date information. Everything below is approximate, unless otherwise specified.

This type is not used in any activity, and only used as part of another schema.

Fields

average_cells_per_column: Option<f64>

How many cells are present per column qualifier in this column family, averaged over all rows containing any column in the column family. e.g. For column family “family” in a table with 3 rows: * A row with 3 cells in “family:col” and 1 cell in “other:col” (3 cells / 1 column in “family”) * A row with 1 cell in “family:col”, 7 cells in “family:other_col”, and 7 cells in “other:data” (8 cells / 2 columns in “family”) * A row with 3 cells in “other:col” (0 columns in “family”, “family” not present) would report (3 + 8 + 0)/(1 + 2 + 0) = 3.66 in this field.

average_columns_per_row: Option<f64>

How many column qualifiers are present in this column family, averaged over all rows in the table. e.g. For column family “family” in a table with 3 rows: * A row with cells in “family:col” and “other:col” (1 column in “family”) * A row with cells in “family:col”, “family:other_col”, and “other:data” (2 columns in “family”) * A row with cells in “other:col” (0 columns in “family”, “family” not present) would report (1 + 2 + 0)/3 = 1.5 in this field.

logical_data_bytes: Option<i64>

How much space the data in the column family occupies. This is roughly how many bytes would be needed to read the contents of the entire column family (e.g. by streaming all contents out).

Trait Implementations

impl Clone for ColumnFamilyStats

fn clone(&self) -> ColumnFamilyStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnFamilyStats

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

Formats the value using the given formatter.

impl Default for ColumnFamilyStats

fn default() -> ColumnFamilyStats

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ColumnFamilyStats

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ColumnFamilyStats

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Part for ColumnFamilyStats