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/**
* Logical types, vector layouts, and schemas
*
* @enum {number}
*/
export declare enum MetadataVersion {
/**
* 0.1.0 (October 2016).
*/
V1 = 0,
/**
* 0.2.0 (February 2017). Non-backwards compatible with V1.
*/
V2 = 1,
/**
* 0.3.0 -> 0.7.1 (May - December 2017). Non-backwards compatible with V2.
*/
V3 = 2,
/**
* >= 0.8.0 (December 2017). Non-backwards compatible with V3.
*/
V4 = 3,
/**
* >= 1.0.0 (July 2020. Backwards compatible with V4 (V5 readers can read V4
* metadata and IPC messages). Implementations are recommended to provide a
* V4 compatibility mode with V5 format changes disabled.
*
* Incompatible changes between V4 and V5:
* - Union buffer layout has changed. In V5, Unions don't have a validity
* bitmap buffer.
*/
V5 = 4
}
/**
* @enum {number}
*/
export declare enum UnionMode {
Sparse = 0,
Dense = 1
}
/**
* @enum {number}
*/
export declare enum Precision {
HALF = 0,
SINGLE = 1,
DOUBLE = 2
}
/**
* @enum {number}
*/
export declare enum DateUnit {
DAY = 0,
MILLISECOND = 1
}
/**
* @enum {number}
*/
export declare enum TimeUnit {
SECOND = 0,
MILLISECOND = 1,
MICROSECOND = 2,
NANOSECOND = 3
}
/**
* @enum {number}
*/
export declare enum IntervalUnit {
YEAR_MONTH = 0,
DAY_TIME = 1,
MONTH_DAY_NANO = 2
}
/**
* ----------------------------------------------------------------------
* The root Message type
* This union enables us to easily send different message types without
* redundant storage, and in the future we can easily add new message types.
*
* Arrow implementations do not need to implement all of the message types,
* which may include experimental metadata types. For maximum compatibility,
* it is best to send data using RecordBatch
*
* @enum {number}
*/
export declare enum MessageHeader {
NONE = 0,
Schema = 1,
DictionaryBatch = 2,
RecordBatch = 3,
Tensor = 4,
SparseTensor = 5
}
/**
* Main data type enumeration.
*
* Data types in this library are all *logical*. They can be expressed as
* either a primitive physical type (bytes or bits of some fixed size), a
* nested type consisting of other data types, or another data type (e.g. a
* timestamp encoded as an int64).
*
* **Note**: Only enum values 0-17 (NONE through Map) are written to an Arrow
* IPC payload.
*
* The rest of the values are specified here so TypeScript can narrow the type
* signatures further beyond the base Arrow Types. The Arrow DataTypes include
* metadata like `bitWidth` that impact the type signatures of the values we
* accept and return.
*
* For example, the `Int8Vector` reads 1-byte numbers from an `Int8Array`, an
* `Int32Vector` reads a 4-byte number from an `Int32Array`, and an `Int64Vector`
* reads a pair of 4-byte lo, hi 32-bit integers as a zero-copy slice from the
* underlying `Int32Array`.
*
* Library consumers benefit by knowing the narrowest type, since we can ensure
* the types across all public methods are propagated, and never bail to `any`.
* These values are _never_ used at runtime, and they will _never_ be written
* to the flatbuffers metadata of serialized Arrow IPC payloads.
*/
export declare enum Type {
NONE = 0,
Null = 1,
Int = 2,
Float = 3,
Binary = 4,
Utf8 = 5,
Bool = 6,
Decimal = 7,
Date = 8,
Time = 9,
Timestamp = 10,
Interval = 11,
List = 12,
Struct = 13,
Union = 14,
FixedSizeBinary = 15,
FixedSizeList = 16,
Map = 17,
Dictionary = -1,
Int8 = -2,
Int16 = -3,
Int32 = -4,
Int64 = -5,
Uint8 = -6,
Uint16 = -7,
Uint32 = -8,
Uint64 = -9,
Float16 = -10,
Float32 = -11,
Float64 = -12,
DateDay = -13,
DateMillisecond = -14,
TimestampSecond = -15,
TimestampMillisecond = -16,
TimestampMicrosecond = -17,
TimestampNanosecond = -18,
TimeSecond = -19,
TimeMillisecond = -20,
TimeMicrosecond = -21,
TimeNanosecond = -22,
DenseUnion = -23,
SparseUnion = -24,
IntervalDayTime = -25,
IntervalYearMonth = -26
}
export declare enum BufferType {
/**
* used in List type, Dense Union and variable length primitive types (String, Binary)
*/
OFFSET = 0,
/**
* actual data, either wixed width primitive types in slots or variable width delimited by an OFFSET vector
*/
DATA = 1,
/**
* Bit vector indicating if each value is null
*/
VALIDITY = 2,
/**
* Type vector used in Union type
*/
TYPE = 3
}
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