Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13401#discussion_r65221948
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -721,8 +716,55 @@ case class GetExternalRowField(
"cannot be null.");
}
- final ${ctx.javaType(dataType)} ${ev.value} = $getField;
+ final Object ${ev.value} = ${row.value}.get($index);
"""
ev.copy(code = code, isNull = "false")
}
}
+
+/**
+ * Validates the actual data type of input expression at runtime. If it
doesn't match the
+ * expectation, throw an exception.
+ */
+case class ValidateExternalType(child: Expression, expected: DataType)
+ extends UnaryExpression with NonSQLExpression with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] =
Seq(ObjectType(classOf[Object]))
+
+ override def nullable: Boolean = child.nullable
+
+ override def dataType: DataType =
RowEncoder.externalDataTypeForInput(expected)
+
+ override def eval(input: InternalRow): Any =
+ throw new UnsupportedOperationException("Only code-generated
evaluation is supported")
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ val input = child.genCode(ctx)
+ val obj = input.value
+
+ val typeCheck = expected match {
+ case _: DecimalType =>
+ Seq(classOf[java.math.BigDecimal], classOf[scala.math.BigDecimal],
classOf[Decimal])
+ .map(cls => s"$obj instanceof ${cls.getName}").mkString(" || ")
+ case _: ArrayType =>
+ s"$obj instanceof ${classOf[Seq[_]].getName} ||
$obj.getClass().isArray()"
+ case _ =>
+ s"$obj instanceof ${ctx.boxedType(dataType)}"
+ }
+
+ val code = s"""
+ ${input.code}
+ ${ctx.javaType(dataType)} ${ev.value} =
${ctx.defaultValue(dataType)};
--- End diff --
This is by means, we can't cast an object to int directly, but have to cast
to boxed int first.
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