Struct BlockStats 

pub struct BlockStats {
    pub min: f64,
    pub max: f64,
    pub null_count: u32,
    pub row_count: u32,
    pub str_min: Option<String>,
    pub str_max: Option<String>,
    pub bloom: Option<Vec<u8>>,
}

Per-block statistics for a single column. Enables predicate pushdown: skip blocks where WHERE price > 100 and block’s max_price < 100.

Fields

min: f64

Minimum value in this block (encoded as f64 for uniformity; i64 values are cast losslessly, strings use NaN).

max: f64

Maximum value in this block.

null_count: u32

Number of null values in this block.

row_count: u32

Number of rows in this block (≤ BLOCK_SIZE, last block may be smaller).

str_min: Option<String>

Lexicographic minimum for string columns (truncated to 32 bytes). None for numeric, bool, binary, vector, and other non-string columns.

str_max: Option<String>

Lexicographic maximum for string columns (truncated to 32 bytes). None for non-string columns.

bloom: Option<Vec<u8>>

Bloom filter bytes for equality-predicate skipping on string columns (256 bytes = 2048 bits, 3 FNV-variant hash functions). None when there are no non-null string values in the block.

Implementations

impl BlockStats

pub fn numeric(min: f64, max: f64, null_count: u32, row_count: u32) -> Self

Create stats for a numeric block with known min/max.

pub fn non_numeric(null_count: u32, row_count: u32) -> Self

Create stats for a block with no meaningful numeric min/max (non-numeric columns).

pub fn string_block( null_count: u32, row_count: u32, str_min: Option<String>, str_max: Option<String>, bloom: Option<Vec<u8>>, ) -> Self

Create stats for a string block with lexicographic bounds and bloom filter.

Trait Implementations

impl Clone for BlockStats

fn clone(&self) -> BlockStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BlockStats

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for BlockStats

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'__msgpack_de> FromMessagePack<'__msgpack_de> for BlockStats

fn read<R: Read<'__msgpack_de>>(reader: &mut R) -> Result<Self, Error>

where Self: Sized,

Reads the MessagePack representation of this value from the provided reader.

impl Serialize for BlockStats

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl ToMessagePack for BlockStats

fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error>

Writes the MessagePack representation of this value into the provided writer.