Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11636#discussion_r56743967
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/BoundAttribute.scala
---
@@ -104,3 +104,32 @@ object BindReferences extends Logging {
}.asInstanceOf[A] // Kind of a hack, but safe. TODO: Tighten return
type when possible.
}
}
+
+/**
+ * A column vector reference points to a specific column for ColumnVector.
+ * columnVar is a variable that keeps ColumnVector, and ordinal is row
index in ColumnVector
+ */
+case class ColumnVectorReference(
+ columnVar: String, ordinal: String, dataType: DataType, nullable:
Boolean)
+ extends LeafExpression {
+
+ override def toString: String = s"columnVector[$columnVar, $ordinal,
${dataType.simpleString}]"
+
+ override def eval(input: InternalRow): Any = null
+
+ override def genCode(ctx: CodegenContext, ev: ExprCode): String = {
+ val javaType = ctx.javaType(dataType)
+ val value = ctx.getValue(columnVar, dataType, ordinal)
+ if (nullable) {
+ s"""
+ boolean ${ev.isNull} = ${columnVar}.isNullAt($ordinal);
+ $javaType ${ev.value} = ${ev.isNull} ?
${ctx.defaultValue(dataType)} : ($value);
--- End diff --
Only these lines are useful, why not put these into DataSourceScan?
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