[GitHub] huaxingao commented on a change in pull request #23741: [SPARK-22798][PYTHON][ML]Add multiple column support to PySpark StringIndexer

[GitBox <gi...@apache.org>]

huaxingao commented on a change in pull request #23741: [SPARK-22798][PYTHON][ML]Add multiple column support to PySpark StringIndexer
URL: https://github.com/apache/spark/pull/23741#discussion_r254557888
 
 

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 File path: python/pyspark/ml/wrapper.py
 ##########
 @@ -87,9 +87,19 @@ def _new_java_array(pylist, java_class):
           - bool -> sc._gateway.jvm.java.lang.Boolean
         """
         sc = SparkContext._active_spark_context
-        java_array = sc._gateway.new_array(java_class, len(pylist))
-        for i in xrange(len(pylist)):
-            java_array[i] = pylist[i]
+        java_array = None
+        if len(pylist) > 0 and isinstance(pylist[0], list):
+            inner_array_length = 0
+            for i in xrange(len(pylist)):
+                inner_array_length = max(inner_array_length, len(pylist[i]))
 
 Review comment:
   Yes. I couldn't figure out a better way to do this. Any suggestions?

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