Module arrow::datatypes

Defines the logical data types of Arrow arrays.

The most important things you might be looking for are:

• Schema to describe a schema.
• Field to describe one field within a schema.
• DataType to describe the type of a field.

Structs

• BooleanType
  A boolean datatype
• Date32Type
  A 32-bit date type representing the elapsed time since UNIX epoch in days(32 bits).
• Date64Type
  A 64-bit date type representing the elapsed time since UNIX epoch in milliseconds(64 bits).
• Decimal128Type
  The decimal type for a Decimal128Array
• Decimal256Type
  The decimal type for a Decimal256Array
• DurationMicrosecondType
  An elapsed time type in microseconds.
• DurationMillisecondType
  An elapsed time type in milliseconds.
• DurationNanosecondType
  An elapsed time type in nanoseconds.
• DurationSecondType
  An elapsed time type in seconds.
• Field
  Describes a single column in a Schema.
• Float16Type
  A 16-bit floating point number type.
• Float32Type
  A 32-bit floating point number type.
• Float64Type
  A 64-bit floating point number type.
• GenericBinaryType
  ByteArrayType for binary arrays
• GenericStringType
  ByteArrayType for string arrays
• Int8Type
  A signed 8-bit integer type.
• Int16Type
  A signed 16-bit integer type.
• Int32Type
  A signed 32-bit integer type.
• Int64Type
  A signed 64-bit integer type.
• IntervalDayTimeType
  A “calendar” interval type in days and milliseconds.
• IntervalMonthDayNanoType
  A “calendar” interval type in months, days, and nanoseconds.
• IntervalYearMonthType
  A “calendar” interval type in months.
• Schema
  Describes the meta-data of an ordered sequence of relative types.
• Time32MillisecondType
  A 32-bit time type representing the elapsed time since midnight in milliseconds.
• Time32SecondType
  A 32-bit time type representing the elapsed time since midnight in seconds.
• Time64MicrosecondType
  A 64-bit time type representing the elapsed time since midnight in microseconds.
• Time64NanosecondType
  A 64-bit time type representing the elapsed time since midnight in nanoseconds.
• TimestampMicrosecondType
  A timestamp microsecond type with an optional timezone.
• TimestampMillisecondType
  A timestamp millisecond type with an optional timezone.
• TimestampNanosecondType
  A timestamp nanosecond type with an optional timezone.
• TimestampSecondType
  A timestamp second type with an optional timezone.
• UInt8Type
  An unsigned 8-bit integer type.
• UInt16Type
  An unsigned 16-bit integer type.
• UInt32Type
  An unsigned 32-bit integer type.
• UInt64Type
  An unsigned 64-bit integer type.
• i256
  A signed 256-bit integer

Enums

• DataType
  The set of datatypes that are supported by this implementation of Apache Arrow.
• IntervalUnit
  YEAR_MONTH, DAY_TIME, MONTH_DAY_NANO interval in SQL style.
• TimeUnit
  An absolute length of time in seconds, milliseconds, microseconds or nanoseconds.
• UnionMode

Constants

• DECIMAL128_MAX_PRECISION
  The maximum precision for DataType::Decimal128 values
• DECIMAL128_MAX_SCALE
  The maximum scale for DataType::Decimal128 values
• DECIMAL256_MAX_PRECISION
  The maximum precision for DataType::Decimal256 values
• DECIMAL256_MAX_SCALE
  The maximum scale for DataType::Decimal256 values
• DECIMAL_DEFAULT_SCALE
  The default scale for DataType::Decimal128 and DataType::Decimal256 values
• MAX_DECIMAL_FOR_EACH_PRECISION
  MAX_DECIMAL_FOR_EACH_PRECISION[p] holds the maximum i128 value that can be stored in arrow_schema::DataType::Decimal128 value of precision p
• MIN_DECIMAL_FOR_EACH_PRECISION
  MIN_DECIMAL_FOR_EACH_PRECISION[p] holds the minimum i128 value that can be stored in a arrow_schema::DataType::Decimal128 value of precision p

Traits

• ArrowDictionaryKeyType
  A subtype of primitive type that represents legal dictionary keys. See https://arrow.apache.org/docs/format/Columnar.html
• ArrowFloatNumericType
  A subtype of primitive type that represents numeric float values
• ArrowNativeType
  Trait expressing a Rust type that has the same in-memory representation as Arrow. This includes i16, f32, but excludes bool (which in arrow is represented in bits).
• ArrowNativeTypeOp
  Trait for ArrowNativeType that adds checked and unchecked arithmetic operations, and totally ordered comparison operations
• ArrowNumericType
  A subtype of primitive type that represents numeric values.
• ArrowPrimitiveType
  Trait bridging the dynamic-typed nature of Arrow (via DataType) with the static-typed nature of rust types (ArrowNativeType) for all types that implement ArrowNativeType.
• ArrowTemporalType
  A subtype of primitive type that represents temporal values.
• ArrowTimestampType
  A timestamp type allows us to create array builders that take a timestamp.
• ByteArrayType
  A trait over the variable-size byte array types
• DecimalType
  A trait over the decimal types, used by PrimitiveArray to provide a generic implementation across the various decimal types
• RunEndIndexType
  A subtype of primitive type that is used as run-ends index in RunArray. See https://arrow.apache.org/docs/format/Columnar.html
• ToByteSlice
  Allows conversion from supported Arrow types to a byte slice.

Functions

• validate_decimal256_precision
  Validates that the specified i256 of value can be properly interpreted as a Decimal256 number with precision precision
• validate_decimal_precision
  Validates that the specified i128 value can be properly interpreted as a Decimal number with precision precision

Type Definitions

• BinaryType
  An arrow binary array with i32 offsets
• LargeBinaryType
  An arrow binary array with i64 offsets
• LargeUtf8Type
  An arrow utf8 array with i64 offsets
• SchemaRef
  A reference-counted reference to a Schema.
• Utf8Type
  An arrow utf8 array with i32 offsets