Github user jackylk commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/229#discussion_r83032371
--- Diff:
processing/src/main/java/org/apache/carbondata/processing/newflow/DataLoadProcessorStep.java
---
@@ -0,0 +1,40 @@
+package org.apache.carbondata.processing.newflow;
+
+import java.util.Iterator;
+
+import
org.apache.carbondata.processing.newflow.exception.CarbonDataLoadingException;
+
+/**
+ * This base interface for data loading. It can do transformation jobs as
per the implementation.
+ *
+ */
+public interface DataLoadProcessorStep {
+
+ /**
+ * The output meta for this step. The data returns from this step is as
per this meta.
+ * @return
+ */
+ DataField[] getOutput();
+
+ /**
+ * Intialization process for this step.
+ * @param configuration
+ * @param child
+ * @throws CarbonDataLoadingException
+ */
+ void intialize(CarbonDataLoadConfiguration configuration,
DataLoadProcessorStep child) throws
--- End diff --
If there is a abstract class, it can have the child as its member variable,
then this `initialize` function takes no parameter as input
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