Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/12364#discussion_r62168548
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects.scala
---
@@ -688,3 +688,38 @@ case class AssertNotNull(child: Expression,
walkedTypePath: Seq[String])
ev.copy(code = code, isNull = "false", value = childGen.value)
}
}
+
+/**
+ * Returns the value of field at index `index` from the external row
`child`.
+ *
+ * Note that the input row and the field we try to get are both guaranteed
to be not null, if they
+ * are null, a runtime exception will be thrown.
+ */
+case class GetExternalRowField(
+ child: Expression,
+ index: Int,
+ dataType: DataType) extends UnaryExpression with NonSQLExpression {
+
+ override def nullable: Boolean = false
+
+ override def eval(input: InternalRow): Any =
+ throw new UnsupportedOperationException("Only code-generated
evaluation is supported")
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ val row = child.genCode(ctx)
+
+ val getField = dataType match {
+ case ObjectType(x) if x == classOf[Row] =>
s"""${row.value}.getStruct($index)"""
+ case _ => s"""(${ctx.boxedType(dataType)})
${row.value}.get($index)"""
+ }
+
+ val code = s"""
+ ${row.code}
+ if (${row.isNull} || ${row.value}.isNullAt($index)) {
+ throw new RuntimeException("Runtime null check failed.");
--- End diff --
Shall we use a more descriptive error message? Would be nice to include
column name / index in the error message.
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