Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/7955#discussion_r36300659
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/rows.scala
---
@@ -23,6 +23,130 @@ import org.apache.spark.sql.types._
import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String}
/**
+ * An extended version of [[InternalRow]] that implements all special
getters, toString
+ * and equals/hashCode by `genericGet`.
+ */
+trait BaseGenericInternalRow extends InternalRow {
+
+ protected def genericGet(ordinal: Int): Any
+
+ // default implementation (slow)
+ private def getAs[T](ordinal: Int) = genericGet(ordinal).asInstanceOf[T]
+ override def isNullAt(ordinal: Int): Boolean = getAs[AnyRef](ordinal) eq
null
+ override def get(ordinal: Int, dataType: DataType): AnyRef =
getAs(ordinal)
+ override def getBoolean(ordinal: Int): Boolean = getAs(ordinal)
+ override def getByte(ordinal: Int): Byte = getAs(ordinal)
+ override def getShort(ordinal: Int): Short = getAs(ordinal)
+ override def getInt(ordinal: Int): Int = getAs(ordinal)
+ override def getLong(ordinal: Int): Long = getAs(ordinal)
+ override def getFloat(ordinal: Int): Float = getAs(ordinal)
+ override def getDouble(ordinal: Int): Double = getAs(ordinal)
+ override def getDecimal(ordinal: Int, precision: Int, scale: Int):
Decimal = getAs(ordinal)
+ override def getUTF8String(ordinal: Int): UTF8String = getAs(ordinal)
+ override def getBinary(ordinal: Int): Array[Byte] = getAs(ordinal)
+ override def getArray(ordinal: Int): ArrayData = getAs(ordinal)
+ override def getInterval(ordinal: Int): CalendarInterval = getAs(ordinal)
+ override def getMap(ordinal: Int): MapData = getAs(ordinal)
+ override def getStruct(ordinal: Int, numFields: Int): InternalRow =
getAs(ordinal)
+
+ override def toString(): String = {
+ if (numFields == 0) {
+ "[ empty row ]"
--- End diff --
Nit: I'd prefer `[empty-row]` to make the format more consistent with
normal rows.
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