Method: Polars::Functions#enable_string_cache

Defined in:
lib/polars/string_cache.rb

#enable_string_cache ⇒ nil

Enable the global string cache.

Categorical columns created under the same global string cache have the same underlying physical value when string values are equal. This allows the columns to be concatenated or used in a join operation, for example.

Examples:

Construct two Series using the same global string cache.

Polars.enable_string_cache
s1 = Polars::Series.new("color", ["red", "green", "red"], dtype: Polars::Categorical)
s2 = Polars::Series.new("color", ["blue", "red", "green"], dtype: Polars::Categorical)
Polars.disable_string_cache

As both Series are constructed under the same global string cache, they can be concatenated.

Polars.concat([s1, s2])
# =>
# shape: (6,)
# Series: 'color' [cat]
# [
#         "red"
#         "green"
#         "red"
#         "blue"
#         "red"
#         "green"
# ]

Returns:

  • (nil) 


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# File 'lib/polars/string_cache.rb', line 63

def enable_string_cache
  Plr.enable_string_cache
end