Class Table<T>

Tables are collections of Vectors and have a Schema. Use the convenience methods makeTable or tableFromArrays to create a table in JavaScript. To create a table from the IPC format, use tableFromIPC.

Type Parameters

T extends TypeMap = any

Index

Constructors

constructor

new Table<T extends TypeMap = any>(): Table<T>
Type Parameters
- T extends TypeMap = any
Returns Table<T>
- Defined in table.ts:70
new Table<T extends TypeMap = any>(batches: Iterable<RecordBatch<T>>): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- batches: Iterable<RecordBatch<T>>
Returns Table<T>
- Defined in table.ts:71
new Table<T extends TypeMap = any>(
...batches: readonly RecordBatch<T>[],
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- ...batches: readonly RecordBatch<T>[]
Returns Table<T>
- Defined in table.ts:72
new Table<T extends TypeMap = any>(
...columns: { [P in string | number | symbol]: Vector<T[P]> }[],
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- ...columns: { [P in string | number | symbol]: Vector<T[P]> }[]
Returns Table<T>
- Defined in table.ts:73
new Table<T extends TypeMap = any>(
    ...columns: {
        [P in string | number | symbol]: Data<T[P]> | DataProps<T[P]>
    }[],
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- ...columns: { [P in string | number | symbol]: Data<T[P]> | DataProps<T[P]> }[]
Returns Table<T>
- Defined in table.ts:74
new Table<T extends TypeMap = any>(
schema: Schema<T>,
...columns: { [P in string | number | symbol]: Vector<T[P]> }[],
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- schema: Schema<T>
- ...columns: { [P in string | number | symbol]: Vector<T[P]> }[]
Returns Table<T>
- Defined in table.ts:75
new Table<T extends TypeMap = any>(
    schema: Schema<T>,
    ...columns: {
        [P in string | number | symbol]: Data<T[P]> | DataProps<T[P]>
    }[],
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- schema: Schema<T>
- ...columns: { [P in string | number | symbol]: Data<T[P]> | DataProps<T[P]> }[]
Returns Table<T>
- Defined in table.ts:76
new Table<T extends TypeMap = any>(
schema: Schema<T>,
data?: RecordBatch<T> | RecordBatch<T>[],
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- schema: Schema<T>
- Optionaldata: RecordBatch<T> | RecordBatch<T>[]
Returns Table<T>
- Defined in table.ts:77
new Table<T extends TypeMap = any>(
    schema: Schema<T>,
    data?: RecordBatch<T> | RecordBatch<T>[],
    offsets?: Uint32Array,
): Table<T>
Type Parameters
- T extends TypeMap = any
Parameters
- schema: Schema<T>
- Optionaldata: RecordBatch<T> | RecordBatch<T>[]
- Optionaloffsets: Uint32Array
Returns Table<T>
- Defined in table.ts:78

Properties

[isConcatSpreadable]

"[isConcatSpreadable]": true

See

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable

`Readonly`batches

batches: RecordBatch<T>[]

The contiguous RecordBatch RecordBatch chunks of the Table rows.

`Readonly`schema

schema: Schema<T>

`Readonly`TArray

TArray: StructRowProxy<T>[]

`Readonly`TType

TType: Struct<T>

`Readonly`TValue

TValue: StructRowProxy<T>

Accessors

data

get data(): Data<Struct<T>>[]
The contiguous RecordBatch RecordBatch chunks of the Table rows.

Returns Data<Struct<T>>[]
- Defined in table.ts:159

nullCount

get nullCount(): number
The number of null rows in this Table.

Returns number
- Defined in table.ts:176

numCols

get numCols(): number
The number of columns in this Table.

Returns number
- Defined in table.ts:164

numRows

get numRows(): number
The number of rows in this Table.

Returns number
- Defined in table.ts:169

Methods

[iterator]

"[iterator]"(): IterableIterator<any>
Iterator for rows in this Table.

Returns IterableIterator<any>
- Defined in table.ts:229

assign

assign<R extends TypeMap = any>(other: Table<R>): Table<T & R>
Type Parameters
- R extends TypeMap = any
Parameters
- other: Table<R>
Returns Table<T & R>
- Defined in table.ts:362

at

at(index: number): null | StructRowProxy<T>
Get an element value by position.
Parameters
- index: number
  The index of the element to read. A negative index will count back from the last element.
Returns null | StructRowProxy<T>
- Defined in table.ts:204

concat

concat(...others: Table<T>[]): Table<T>
Combines two or more Tables of the same schema.
Parameters
- ...others: Table<T>[]
  Additional Tables to add to the end of this Tables.
Returns Table<T>
- Defined in table.ts:259

get

get(index: number): null | StructRowProxy<T>
Get an element value by position.
Parameters
- index: number
  The index of the element to read.
Returns null | StructRowProxy<T>
- Defined in table.ts:197

getChild

getChild<P extends string | number | symbol>(name: P): null | Vector<T[P]>
Returns a child Vector by name, or null if this Vector has no child with the given name.
Type Parameters
- P extends string | number | symbol
Parameters
- name: P
  The name of the child to retrieve.
Returns null | Vector<T[P]>
- Defined in table.ts:283

getChildAt

getChildAt<R extends DataType = any>(index: number): null | Vector<R>
Returns a child Vector by index, or null if this Vector has no child at the supplied index.
Type Parameters
- R extends DataType = any
Parameters
- index: number
  The index of the child to retrieve.
Returns null | Vector<R>
- Defined in table.ts:292

indexOf

indexOf(element: StructRowProxy<T>, offset?: number): number
Retrieve the index of the first occurrence of a value in an Vector.
Parameters
- element: StructRowProxy<T>
  The value to locate in the Vector.
- Optionaloffset: number
  The index at which to begin the search. If offset is omitted, the search starts at index 0.
Returns number
- Defined in table.ts:224

isValid

isValid(index: number): boolean
Check whether an element is null.
Parameters
- index: number
  The index at which to read the validity bitmap.
Returns boolean
- Defined in table.ts:189

select

select<K extends string | number | symbol = any>(
columnNames: K[],
): Table<{ [key: string]: any }>
Construct a new Table containing only specified columns.
Type Parameters
- K extends string | number | symbol = any
Parameters
- columnNames: K[]
  Names of columns to keep.
Returns Table<{ [key: string]: any }>
A new Table of columns matching the specified names.
- Defined in table.ts:345

selectAt

selectAt<K extends DataType = any>(
columnIndices: number[],
): Table<{ [key: string]: K }>
Construct a new Table containing only columns at the specified indices.
Type Parameters
- K extends DataType = any
Parameters
- columnIndices: number[]
  Indices of columns to keep.
Returns Table<{ [key: string]: K }>
A new Table of columns at the specified indices.
- Defined in table.ts:356

set

set(index: number, value: null | StructRowProxy<T>): void
Set an element value by position.
Parameters
- index: number
  The index of the element to write.
- value: null | StructRowProxy<T>
  The value to set.
Returns void
- Defined in table.ts:215

setChild

setChild<P extends string | number | symbol, R extends DataType>(
name: P,
child: Vector<R>,
): Table<T & { [K in string | number | symbol]: R }>
Sets a child Vector by name.
Type Parameters
- P extends string | number | symbol
- R extends DataType
Parameters
- name: P
  The name of the child to overwrite.
- child: Vector<R>
Returns Table<T & { [K in string | number | symbol]: R }>
A new Table with the supplied child for the specified name.
- Defined in table.ts:311

setChildAt

setChildAt(index: number, child?: null): Table
Sets a child Vector by index.
Parameters
- index: number
  The index of the child to overwrite.
- Optionalchild: null
Returns Table
A new Table with the supplied child at the specified index.
- Defined in table.ts:321
setChildAt<R extends DataType = any>(index: number, child: Vector<R>): Table
Sets a child Vector by index.
Type Parameters
- R extends DataType = any
Parameters
- index: number
  The index of the child to overwrite.
- child: Vector<R>
Returns Table
A new Table with the supplied child at the specified index.
- Defined in table.ts:322

slice

slice(begin?: number, end?: number): Table<T>
Return a zero-copy sub-section of this Table.
Parameters
- Optionalbegin: number
  The beginning of the specified portion of the Table.
- Optionalend: number
  The end of the specified portion of the Table. This is exclusive of the element at the index 'end'.
Returns Table<T>
- Defined in table.ts:271

toArray

toArray(): any[]
Return a JavaScript Array of the Table rows.

Returns any[]
An Array of Table rows.
- Defined in table.ts:241

toString

toString(): string
Returns a string representation of the Table rows.

Returns string
A string representation of the Table rows.
- Defined in table.ts:250

Class Table<T>

Type Parameters

Index

Constructors

Properties

Accessors

Methods

Constructors

constructor

Type Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Type Parameters

Parameters

Returns Table<T>

Properties

[isConcatSpreadable]

See

Readonlybatches

Readonlyschema

ReadonlyTArray

ReadonlyTType

ReadonlyTValue

Accessors

data

Returns Data<Struct<T>>[]

nullCount

Returns number

numCols

Returns number

numRows

Returns number

Methods

[iterator]

Returns IterableIterator<any>

assign

Type Parameters

Parameters

Returns Table<T & R>

at

Parameters

Returns null | StructRowProxy<T>

concat

Parameters

Returns Table<T>

get

Parameters

Returns null | StructRowProxy<T>

getChild

Type Parameters

Parameters

Returns null | Vector<T[P]>

getChildAt

Type Parameters

Parameters

Returns null | Vector<R>

indexOf

Parameters

Returns number

isValid

`Readonly`batches

`Readonly`schema

`Readonly`TArray

`Readonly`TType

`Readonly`TValue