Enum CountMethod 

pub enum CountMethod {
    ParquetMetadata,
    FullScan,
    Sampling,
    StreamFullScan,
}

Method used to obtain the row count.

Variants

ParquetMetadata

Read from Parquet file footer metadata (exact, zero row reading).

FullScan

Full scan of the file (exact).

Sampling

Sample-based estimation (approximate).

StreamFullScan

Full scan of a streaming source (no file metadata available).

Trait Implementations

impl Clone for CountMethod

fn clone(&self) -> CountMethod

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CountMethod

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CountMethod

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for CountMethod

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for CountMethod

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for CountMethod

impl Eq for CountMethod

impl StructuralPartialEq for CountMethod