| polars arg-where | Creates an expression that returns the arguments where expression is true.
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| polars as | Creates an alias expression.
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| polars col | Creates a named column expression.
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| polars concat-str | Creates a concat string expression.
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| polars datepart | Creates an expression for capturing the specified datepart in a column.
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| polars is-in | Creates an is-in expression or checks to see if the elements are contained in the right series
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| polars lit | Creates a literal expression.
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| polars otherwise | Completes a when expression.
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| polars when | Creates and modifies a when expression.
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