Struct LogDataHandler

pub struct LogDataHandler<'a> { /* private fields */ }

Provides semanitc access to the log data.

This is a helper struct that provides access to the log data in a more semantic way to avid the necessiity of knowing the exact layout of the underlying log data.

Trait Implementations

impl<'a> IntoIterator for LogDataHandler<'a>

type Item = LogicalFile<'a>

The type of the elements being iterated over.

type IntoIter = Box<dyn Iterator<Item = <LogDataHandler<'a> as IntoIterator>::Item> + 'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a> PruningStatistics for LogDataHandler<'a>

fn min_values(&self, column: &Column) -> Option<ArrayRef>

return the minimum values for the named column, if known. Note: the returned array must contain num_containers() rows

fn max_values(&self, column: &Column) -> Option<ArrayRef>

return the maximum values for the named column, if known. Note: the returned array must contain num_containers() rows.

fn num_containers(&self) -> usize

return the number of containers (e.g. row groups) being pruned with these statistics

fn null_counts(&self, column: &Column) -> Option<ArrayRef>

return the number of null values for the named column as an Option<UInt64Array>.

Note: the returned array must contain num_containers() rows.

fn row_counts(&self, _column: &Column) -> Option<ArrayRef>

return the number of rows for the named column in each container as an Option<UInt64Array>.

Note: the returned array must contain num_containers() rows

fn contained( &self, _column: &Column, _value: &HashSet<ScalarValue>, ) -> Option<BooleanArray>

Returns BooleanArray where each row represents information known about specific literal values in a column.