JoinType

There are four basic joins which may be performed between two indexed Saddle objects such as org.saddle.Series or org.saddle.Frame.

• InnerJoin
• OuterJoin (also known as a full join)
• LeftJoin
• RightJoin

These are defined analogously to SQL joins.

For example, an output key will be generated in the following situations:

• Inner: key exists in both input indexes
• Outer: key exists in either or both input indexes
• Left: key exists in left or both input indexes
• Right: key exists in right or both input indexes