nsivabalan commented on a change in pull request #3247:
URL: https://github.com/apache/hudi/pull/3247#discussion_r671356705



##########
File path: 
hudi-client/hudi-spark-client/src/main/java/org/apache/hudi/keygen/BuiltinKeyGenerator.java
##########
@@ -81,7 +105,52 @@ public String getPartitionPath(Row row) {
     return getKey(genericRecord).getPartitionPath();
   }
 
-  void buildFieldPositionMapIfNeeded(StructType structType) {
+  /**
+   * Fetch partition path from {@link InternalRow}.
+   *
+   * @param internalRow {@link InternalRow} instance from which partition path 
needs to be fetched from.
+   * @param structType  schema of the internalRow.
+   * @return the partition path.
+   */
+  public String getPartitionPath(InternalRow internalRow, StructType 
structType) {
+    try {
+      Row row = deserializeRow(getEncoder(structType), internalRow);
+      return getPartitionPath(row);
+    } catch (Exception e) {
+      throw new HoodieIOException("Conversion of InternalRow to Row failed 
with exception " + e);
+    }
+  }
+
+  private ExpressionEncoder getEncoder(StructType structType) {
+    if (encoder == null) {
+      encoder = getRowEncoder(structType);
+    }
+    return encoder;
+  }
+
+  private static ExpressionEncoder getRowEncoder(StructType schema) {
+    List<Attribute> attributes = 
JavaConversions.asJavaCollection(schema.toAttributes()).stream()
+        .map(Attribute::toAttribute).collect(Collectors.toList());
+    return RowEncoder.apply(schema)

Review comment:
       yes.




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