Module datatable 

Re-exports

pub use crate::column_types::dtype_label;

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().

DataTable

DataTableState

DatasetAtOpen

The footers’ account of a dataset of many files.

ExportFrame

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

FillPlan

What the worker that reads a fill needs to make it the buffer: the rows on hand it runs on from or up to, the view, and the caps, as they were when it was planned.

FootersFound

What reading every footer turned up, and everything built from it that the dataset has to be given together — the schema and the scans that read 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 about a dataset besides its frame and schema: given to the state once, by DataTableState::with_open, so the count, the row groups, the files and the notes all describe the same open. Each field’s default means the open did not find it.

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 of them: a remote one, or a local Hive directory once every footer is known.

RemoteRead

How a remote dataset reads some of its files, as the pass behind an open found them.

Sampled

A view’s sample: the step between the source and the query. The view’s frames scan Self::frame, the chunks kept so far, which grows as the draw goes on.

Typing

The columns a read gave a type, the frame before it did, and its notes.

ViewRollback

The view as it stood before a query or view replaced it: a checkpoint. A query plans without reading anything and can still fail once it runs — a value that will not cast — and then the table goes back to this, rows and all, rather than keep a frame that fails on every scroll. Frames and buffers are shared, not copied.

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 not set. Also the window a remote scan buffers when the cap is switched off.

PIVOT_COLUMN_LIMIT

The most columns a pivot may make. Past it the table, the schema and every view of them slow to a crawl; a pivot on a column with this many values is almost always a mistake (an id or a timestamp picked 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, with the columns named in the second argument read as text from every file rather than as the type most rows have.

FootersJoin

Reads every footer of a dataset that opened from a couple of them, and returns what they say. None when they could not be read, in which case the dataset stays as it opened. Blocks, and counts itself off against the progress it is given.