abstract class Projection extends (InternalRow) => InternalRow with ExpressionsEvaluator
Converts a InternalRow to another Row given a sequence of expression that define each column of the new row. If the schema of the input row is specified, then the given expression will be bound to that schema.
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- new Projection()
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- abstract def apply(v1: InternalRow): InternalRow
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- def andThen[A](g: (InternalRow) => A): (InternalRow) => A
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- def compose[A](g: (A) => InternalRow): (A) => InternalRow
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- def initialize(partitionIndex: Int): Unit
Initializes internal states given the current partition index.
Initializes internal states given the current partition index. This is used by nondeterministic expressions to set initial states. The default implementation does nothing.
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- ExpressionsEvaluator
- def initializeExprs(exprs: Seq[Expression], partitionIndex: Int): Unit
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- def prepareExpressions(exprs: Seq[Expression], subExprEliminationEnabled: Boolean): Seq[Expression]
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- ExpressionsEvaluator
- lazy val runtime: SubExprEvaluationRuntime
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