Function getDuplicateJoinColumns

The column names, in left schema order, that both inputs have, in any case, but for a positionally identical key and the extra names, which Difference renames on both sides (its difference columns), so they never meet. Each one would be two columns of one name in the output, so a join with any is invalid.

  • getDuplicateJoinColumns(
        leftSchema: Schema,
        rightSchema: Schema,
        leftColumns: readonly string[],
        rightColumns: readonly string[],
        extra?: readonly string[],
    ): string[]

    Parameters

    • leftSchema: Schema
    • rightSchema: Schema
    • leftColumns: readonly string[]
    • rightColumns: readonly string[]
    • Optionalextra: readonly string[]

    Returns string[]

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