Struct polars_lazy::frame::JoinBuilder

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pub struct JoinBuilder { /* private fields */ }

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impl JoinBuilder

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pub fn new(lf: LazyFrame) -> Self

Create the JoinBuilder with the provided LazyFrame as the left table.

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pub fn with(self, other: LazyFrame) -> Self

The right table in the join.

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pub fn how(self, how: JoinType) -> Self

Select the join type.

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pub fn validate(self, validation: JoinValidation) -> Self

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pub fn on<E: AsRef<[Expr]>>(self, on: E) -> Self

The expressions you want to join both tables on.

The passed expressions must be valid in both LazyFrames in the join.

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pub fn left_on<E: AsRef<[Expr]>>(self, on: E) -> Self

The expressions you want to join the left table on.

The passed expressions must be valid in the left table.

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pub fn right_on<E: AsRef<[Expr]>>(self, on: E) -> Self

The expressions you want to join the right table on.

The passed expressions must be valid in the right table.

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pub fn allow_parallel(self, allow: bool) -> Self

Allow parallel table evaluation.

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pub fn force_parallel(self, force: bool) -> Self

Force parallel table evaluation.

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pub fn join_nulls(self, join_nulls: bool) -> Self

Join on null values. By default null values will never produce matches.

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pub fn suffix<S: AsRef<str>>(self, suffix: S) -> Self

Suffix to add duplicate column names in join. Defaults to "_right" if this method is never called.

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pub fn finish(self) -> LazyFrame

Finish builder

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