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https://issues.apache.org/jira/browse/ARROW-12762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche updated ARROW-12762:
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Summary: [Python] ListType doesn't preserve field name after pickle and
unpickle (was: [Python] pyarrow.lib.Schema equality fails after pickle and
unpickle)
> [Python] ListType doesn't preserve field name after pickle and unpickle
> -----------------------------------------------------------------------
>
> Key: ARROW-12762
> URL: https://issues.apache.org/jira/browse/ARROW-12762
> Project: Apache Arrow
> Issue Type: Bug
> Affects Versions: 4.0.0
> Reporter: Juan Galvez
> Priority: Major
>
> Here is a small reproducer:
> {code:python}
> import pandas as pd
> from pyspark.sql import SparkSession
> import pyarrow.parquet as pq
> import pickle
> df = pd.DataFrame(
> {
> "A": [
> ["aa", "bb "],
> ["c"],
> ["d", "ee", "", "f"],
> ["ggg", "H"],
> [""],
> ]
> }
> )
> spark = SparkSession.builder.appName("GenSparkData").getOrCreate()
> spark_df = spark.createDataFrame(df)
> spark_df.write.parquet("list_str.pq", "overwrite")
> ds = pq.ParquetDataset("list_str.pq")
> assert pickle.loads(pickle.dumps(ds.schema)) == ds.schema # PASSES
> assert pickle.loads(pickle.dumps(ds.schema.to_arrow_schema())) ==
> ds.schema.to_arrow_schema() # FAILS
> {code}
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