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VortexFile

vortex_file

Struct VortexFile 

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

Represents a Vortex file, providing access to its metadata and content.

A VortexFile is created by opening a Vortex file using VortexOpenOptions. It provides methods for accessing file metadata (such as row count, data type, and statistics) and for initiating scans to read the file’s contents.

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impl VortexFile

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pub fn new( footer: Footer, segment_source: Arc<dyn SegmentSource>, session: VortexSession, ) -> Self

Creates a new VortexFile from the given footer, segment source, and session.

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pub fn with_caching(self) -> Self

Enable layout reader caching.

Repeated calls to layout_reader, scan, and data_source will share the same reader tree.

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pub fn footer(&self) -> &Footer

Returns a reference to the file’s footer, which contains metadata and layout information.

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pub fn row_count(&self) -> u64

Returns the number of rows in the file.

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pub fn dtype(&self) -> &DType

Returns the data type of the file’s contents.

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pub fn file_stats(&self) -> Option<&FileStatistics>

Returns the file’s statistics, if available.

Statistics can be used for query optimization and data exploration.

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pub fn segment_source(&self) -> Arc<dyn SegmentSource>

Create a new segment source for reading from the file.

This may spawn a background I/O driver that will exit when the returned segment source is dropped.

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pub fn session(&self) -> &VortexSession

Returns a reference to the Vortex session used to open this file.

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pub fn layout_reader(&self) -> VortexResult<Arc<dyn LayoutReader>>

Create a new layout reader for the file.

Wraps the root layout in a FileStatsLayoutReader if file stats are available.

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pub fn data_source(&self) -> VortexResult<DataSourceRef>

Create a DataSource from this file for scanning.

Wraps the file’s layout reader with FileStatsLayoutReader (when file-level statistics are available) and LayoutReaderDataSource.

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pub fn scan(&self) -> VortexResult<ScanBuilder<ArrayRef>>

Initiate a scan of the file, returning a builder for projection, filtering, selection, and execution options.

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pub fn can_prune(&self, filter: &Expression) -> VortexResult<bool>

Returns true if file-level statistics prove the expression cannot match any rows in this file.

Row-count-aware pruning predicates are evaluated with the file’s total row count as their scope.

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pub fn splits(&self) -> VortexResult<Vec<Range<u64>>>

Return the file’s natural row splits as root-coordinate ranges.

These are the ranges that SplitBy::Layout would use for an all-fields scan.

Trait Implementations§

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impl Clone for VortexFile

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fn clone(&self) -> VortexFile

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

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