KeyCollisionFunction

is an option for JoinAcross that specifies how to handle pairs of elements that are not being joined but nevertheless have the same key.

Details

	None	drop both elements
	Left	include only the left element (default)
	Right	include only the right element
	func	apply func to generate a pair of new keys

Examples

When a matching key b is not used for joining, the left value for this key is used by default:

Use KeyCollisionFunction to specify which value of the colliding key should be returned:

Generate new keys instead of a colliding key:

Omit colliding keys:

Specify which values to take for colliding keys:

Specifically pick the right values for colliding keys:

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