Projection Contract — Functions to Produce InternalRow for InternalRow

Projection is a contract of Scala functions that produce an internal binary row for a given internal row.

Projection: InternalRow => InternalRow

Projection can optionally be initialized with the current partition index (which by default does nothing).

initialize(partitionIndex: Int): Unit = {}

Note	`initialize` is overriden by InterpretedProjection and `InterpretedMutableProjection` projections that are used in interpreted expression evaluation.

Table 1. Projections
Projection	Description
UnsafeProjection
InterpretedProjection
`IdentityProjection`
`MutableProjection`
`InterpretedMutableProjection`	Appears not to be used anymore

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