Update README.md

Author: codspire

README.md

@@ -1,4 +1,56 @@
-# spark-dataframe-gz-csv-read-issue
-Issue reading csv gz file Spark DataFrame
+## Issue reading csv gz file Spark DataFrame
 
 https://github.com/databricks/spark-csv/issues/436
+
+
+### Workaround is to rename the column 
+(inspired by https://stackoverflow.com/questions/34077353/how-to-change-dataframe-column-names-in-pyspark)
+
+```python
+%pyspark
+
+from functools import reduce
+
+data = spark.createDataFrame([("Alberto", 2), ("Dakota", 2)], 
+                                  ["Name", "askdaosdka"])
+data.show()
+data.printSchema()
+
+oldColumns = data.schema.names
+print(oldColumns)
+
+newColumns = oldColumns[:]
+newColumns[1] = "Age"
+
+print(newColumns)
+
+df = reduce(lambda data, idx: data.withColumnRenamed(oldColumns[idx], newColumns[idx]), range(len(oldColumns)), data)
+df.printSchema()
+df.show()
+```
+
+```sh
++-------+----------+
+|   Name|askdaosdka|
++-------+----------+
+|Alberto|         2|
+| Dakota|         2|
++-------+----------+
+
+root
+ |-- Name: string (nullable = true)
+ |-- askdaosdka: long (nullable = true)
+
+['Name', 'askdaosdka']
+['Name', 'Age']
+root
+ |-- Name: string (nullable = true)
+ |-- Age: long (nullable = true)
+
++-------+---+
+|   Name|Age|
++-------+---+
+|Alberto|  2|
+| Dakota|  2|
++-------+---+
+```