Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14809
If we do not specify the schema, it will behave like what you said. For
example,
```Scala
sparkSession.catalog.createExternalTable(
"createdParquetTable",
"parquet",
Map.empty[String, String])
```
```
Unable to infer schema for ParquetFormat at . It must be specified manually;
org.apache.spark.sql.AnalysisException: Unable to infer schema for
ParquetFormat at . It must be specified manually;
```
However, if we specify the schema, we will not get an error.
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