maropu commented on pull request #30850:
URL: https://github.com/apache/spark/pull/30850#issuecomment-748598298
Which case you pointed out? This one?
```
scala> sql("select rand()").write.save("/tmp/test")
org.apache.spark.sql.AnalysisException: Attribute name "rand()" contains
invalid character(s) among " ,;{}()\n\t=". Please use alias to rename it.
at
org.apache.spark.sql.execution.datasources.parquet.ParquetSchemaConverter$.checkConversionRequirement(ParquetSchemaConverter.scala:579)
at
org.apache.spark.sql.execution.datasources.parquet.ParquetSchemaConverter$.checkFieldName(ParquetSchemaConverter.scala:570)
```
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