ZoneMap

vortex_layout::layouts::zoned::zone_map

Struct ZoneMap 

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pub struct ZoneMap { /* private fields */ }
Expand description

A zone map containing statistics for a column. Each row of the zone map corresponds to a chunk of the column.

Note that it’s possible for the zone map to have no statistics.

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impl ZoneMap

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pub fn try_new( column_dtype: DType, array: StructArray, stats: Arc<[Stat]>, ) -> VortexResult<Self>

Create ZoneMap of given column_dtype from given array. Validates that the array matches expected structure for given list of stats.

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pub unsafe fn new_unchecked(array: StructArray, stats: Arc<[Stat]>) -> Self

Creates ZoneMap without validating return array against expected stats.

§Safety

Assumes that the input struct array has the correct statistics as fields. Or in other words, the DType of the input array is equal to the result of Self::dtype_for_stats_table.

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pub fn dtype_for_stats_table( column_dtype: &DType, present_stats: &[Stat], ) -> DType

Returns the DType of the statistics table given a set of statistics and column DType.

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pub fn array(&self) -> &StructArray

Returns the underlying StructArray backing the zone map

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pub fn present_stats(&self) -> &Arc<[Stat]>

Returns the list of stats included in the zone map.

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pub fn to_stats_set(&self, stats: &[Stat]) -> VortexResult<StatsSet>

Returns an aggregated stats set for the table.

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pub fn get_stat(&self, stat: Stat) -> VortexResult<Option<ArrayRef>>

Returns the array for a given stat.

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pub fn prune(&self, predicate: &Expression) -> VortexResult<Mask>

Apply a pruning predicate against the ZoneMap, yielding a mask indicating which zones can be pruned.

The expression provided should be the result of converting an existing VortexExpr via checked_pruning_expr into a prunable expression that can be evaluated on a zone map.

All zones where the predicate evaluates to true can be skipped entirely.

Trait Implementations§

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impl Clone for ZoneMap

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fn clone(&self) -> ZoneMap

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more

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