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object JoinedProjection

Helper class for generating a joined projection.

This class is used to instantiate a "Joined Row" - a wrapper that makes two rows appear to be a single concatenated row, by using nested access. It is primarily used during statistics collection to update a buffer of per-column aggregates (i.e. the left-hand side row) with stats from the latest row processed (i.e. the right-hand side row).

Implementation Note: If we instead stored leftRow and rightRow we would have to perform size checks on leftRow during every access, which is slow.

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  5. def bind(leftAttributes: Seq[Attribute], rightAttributes: Seq[Attribute], projectList: Seq[Expression], leftCanBeNull: Boolean = false, rightCanBeNull: Boolean = false): Seq[Expression]

    Bind attributes for a joined projection.

    Bind attributes for a joined projection. This resulting project list expects an input row that has two nested struct fields, the struct at position 0 must be the left hand row of the join, and the struct at position 1 must be the right hand row of the join.

    The following shows example shows how this can be used for updating an aggregation buffer:

     val buffer = new GenericInternalRow()

val update = GenerateMutableProjection.generate(
   expressions = JoinedProjection(
     leftAttributes = bufferAttrs,
     rightAttributes = dataCols,
     projectList = aggregates.flatMap(_.updateExpressions)),
   inputSchema = Nil,
   useSubexprElimination = true
 ).target(buffer)

 val joinedRow = new GenericInternalRow(2)
 joinedRow.update(0, input)

 def updateBuffer(input: InternalRow): Unit = {
   joinedRow.update(1, input)
   update(joinedRow)
 }
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