Pavlo Z. created SPARK-23271:
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Summary: Parquet output contains only "_SUCCESS" file after empty
DataFrame saving
Key: SPARK-23271
URL: https://issues.apache.org/jira/browse/SPARK-23271
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.2.0
Reporter: Pavlo Z.
Attachments: parquet-empty-output.zip
Sophisticated case, reproduced only if read empty CSV file without header with
assigned schema.
Steps for reproduce (Scala):
{code:java}
val anySchema = StructType(StructField("anyName", StringType, nullable = false)
:: Nil)
val inputDF = spark.read.schema(anySchema).csv(inputFolderWithEmptyCSVFile)
inputDF.write.parquet(outputFolderName)
// Exception: org.apache.spark.sql.AnalysisException: Unable to infer schema
for Parquet. It must be specified manually.;
val actualDF = spark.read.parquet(outputFolderName)
{code}
*Actual:* Only "_SUCCESS" file in output directory
*Expected*: at least one Parquet file with schema.
Project for reproduce is attached.
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