Trait mz_persist_types::columnar::ColumnEncoder
source · pub trait ColumnEncoder<T> {
type FinishedColumn: Array + Debug + 'static;
// Required methods
fn append(&mut self, val: &T);
fn append_null(&mut self);
fn finish(self) -> Self::FinishedColumn;
}
Expand description
An encoder for values of a fixed schema
This allows us to amortize the cost of downcasting columns into concrete types.
Required Associated Types§
sourcetype FinishedColumn: Array + Debug + 'static
type FinishedColumn: Array + Debug + 'static
Type of column that this encoder returns when finalized.
Required Methods§
sourcefn append_null(&mut self)
fn append_null(&mut self)
Appends a null value onto this encoder.
sourcefn finish(self) -> Self::FinishedColumn
fn finish(self) -> Self::FinishedColumn
Finish this encoder, returning an immutable column and statistics.