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Posted to user@spark.apache.org by "Lord, Jesse" <Je...@allstate.com> on 2018/04/20 19:35:15 UTC
Spark read parquet with unnamed index
When reading a parquet created from a pandas dataframe with an unnamed index spark creates a column named “__index_level_0__” since spark DataFrames do not support row indexing. This looks like it is probably a bug to me, since as a spark user I would expect unnamed index columns to be dropped on read, but might be intended.
import pandas as pd
from pyspark.sql import SparkSession
spark = SparkSession.builder.getOrCreate()
pandas_frame = pd.DataFrame({'str_col': ['a', 'b'], 'num_col':[1, 2]})
pandas_frame.to_parquet('test.parquet')
spark_frame = spark.read.parquet('test.parquet')
spark_frame.show()
+-------+-------+-----------------+
|num_col|str_col|__index_level_0__|
+-------+-------+-----------------+
| 1| a| 0|
| 2| b| 1|
+-------+-------+-----------------+
Thanks,
Jesse