Yuchen Huo created SPARK-23822:
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Summary: Improve error message for Parquet schema mismatches
Key: SPARK-23822
URL: https://issues.apache.org/jira/browse/SPARK-23822
Project: Spark
Issue Type: Improvement
Components: Input/Output
Affects Versions: 2.3.0
Reporter: Yuchen Huo
If a user attempts to read Parquet files with mismatched schemas and schema
merging is disabled then this may result in a very confusing
UnsupportedOperationException and ParquetDecodingException errors from Parquet.
e.g.
{code:java}
Seq(("bcd")).toDF("a").coalesce(1).write.mode("overwrite").parquet(s"$path/")
Seq((1)).toDF("a").coalesce(1).write.mode("append").parquet(s"$path/")
spark.read.parquet(s"$path/").collect()
{code}
Would result in
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