Module table 

Structs

CellHit

What a click on the table lands on: the row on screen, counted from the top (none on the header), and the column (none on the rail or the row numbers).

CollectRequest

Parameters for a background buffer load. Produced by prepare_async_collect().

CollectResult

Result of a background buffer load, made by FillPlan::fit on the worker and installed as it is by apply_async_collect().

DataTableState

DatasetAtOpen

The footers’ account of a dataset of many files.

ExportFrame

The rows an export writes. See DataTableState::export_frame.

FillPlan

What the fill-reading worker needs to make it the buffer: the adjoining rows on hand, the view and the caps, as planned. A trim that would copy (see trim_rows) runs here, off the UI thread; apply_async_collect installs the result as is.

FootersFound

What reading every footer found, and what the dataset must be given with it: the schema and the scans built at that schema.

InspectField

One field the row inspector lists: a column of the frame on screen.

InspectRow

The selected row as the buffer holds it; see DataTableState::inspect_row.

OpenFacts

What an open learned besides frame and schema, given once via DataTableState::with_open so count, row groups, files and notes agree. Defaults mean not found.

PivotJob

A pivot of the view as it was when planned, to be read off the UI thread.

RemoteFiles

A dataset of many files and how to read only some: remote, or a local Hive directory once every footer is known. Polars reads files in order (row 900,000 means reading every file before it); with each file’s rows known, a buffer scans just the files holding its rows.

RemoteRead

How a remote dataset reads some of its files, as the pass behind an open found them. Together because they describe one list: the scan is built at the new schema, and the counter answers one entry per file, which must match urls or its answer is dropped.

Sampled

A view’s sample, between source and query. The frames scan Self::frame, the chunks so far, growing as the draw continues.

ViewChange

What a sidebar apply changed besides the columns.

ViewRollback

The view as it stood before a query or view replaced it: a checkpoint. A query can plan and still fail on its rows (a value that will not cast); then the table returns to this, rows and all. Frames and buffers are shared, not copied. Taken by DataTableState::rollback_point or DataTableState::try_transition, restored by DataTableState::roll_back.

Enums

DrillRow

The row a drill into a group reads, from DataTableState::drill_row.

NullKind

What a null means where the files of a dataset differ.

Constants

DEFAULT_MAX_BUFFERED_ROWS

Rows the display buffer may hold when performance.max_buffered_rows is unset; also a remote scan’s window when the cap is off.

PIVOT_COLUMN_LIMIT

The most columns a pivot may make: past it everything crawls, and it is nearly always a mistake (an id or timestamp chosen for Columns).

Type Aliases

DrawnColumns

Each column drawn: its cells across, [from, to), and its name.

FileCounter

Counts the rows in each row group of every file of a dataset. Blocks.

FileScan

Builds a scan of some of a dataset’s files as the full scan reads them, the second argument’s columns read as text from every file instead of the majority type.

FootersJoin

Reads every footer of a dataset opened from a couple of them; None when they could not be read (the dataset stays as opened). Blocks, reporting to the progress.