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DictionaryType class DictionaryType Arrow R Package Skip to contents
Arrow R Package 25.0.1

DictionaryType class

Source: R/dictionary.R
DictionaryType.Rd

DictionaryType is a FixedWidthType that represents dictionary-encoded data. Dictionary encoding stores unique values in a dictionary and uses integer-type indices to reference them, which can be more memory-efficient for data with many repeated values.

R6 Methods

  • $ToString(): Return a string representation of the dictionary type

  • $code(namespace = FALSE): Return R code to create this dictionary type

Active bindings

  • $index_type: The DataType for the dictionary indices (must be an integer type, signed or unsigned)

  • $value_type: The DataType for the dictionary values

  • $name: The name of the type.

  • $ordered: Whether the dictionary is ordered.

Factory

DictionaryType$create() takes the following arguments:

  • index_type: A DataType for the indices (default int32())

  • value_type: A DataType for the values (default utf8())

  • ordered: Is this an ordered dictionary (default FALSE)?

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