LazyFrame.join

LazyFrame join(LazyFrame other,  string on,
          JoinKind kind =  JoinKind.INNER,  string suffix =  "_right")

@safe

Joins this plan with another deferred frame on one key column present in both (the deferred form of the eager DataFrame .join; both children materialise, the join runs eagerly, the emission order and null-key semantics are the eager ones).

Parameters

`other`	the right deferred frame
`on`	the key column name, present in both frames
`kind`	INNER, LEFT, SEMI, ANTI or OUTER
`suffix`	the right-side collision suffix

Returns

the joined deferred frame (blocking for streaming).

LazyFrame join(LazyFrame other,  string leftOn,  string rightOn,
          JoinKind kind =  JoinKind.INNER,  string suffix =  "_right")

@safe

Ditto, with different key column names on the two sides.

LazyFrame join(LazyFrame other,  string[]  leftOn,  string[]  rightOn,
          JoinKind kind =  JoinKind.INNER,  string suffix =  "_right")

@safe

Ditto, the multi-column join (ADR-2026-10-30-03).

LazyFrame join(LazyFrame other,  string[]  on,
          JoinKind kind =  JoinKind.INNER,  string suffix =  "_right")

@safe

Ditto, the same key names on both sides.

LazyFrame join(DataFrame other,  string on,
          JoinKind kind =  JoinKind.INNER,  string suffix =  "_right")

@safe

Ditto, joining an eager frame (wrapped as a source plan).

LazyFrame join(DataFrame other,  string leftOn,  string rightOn,
          JoinKind kind =  JoinKind.INNER,  string suffix =  "_right")

@safe

Ditto, with different key column names on the two sides.