Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/17776 When users do not provide alias name in the SELECT query, we call `toPrettySQL` to generate the alias name. For example, the string `get_json_object(jstring, '$.f1')` will be the alias name for the function call in the statement ```SQL SELECT key, get_json_object(jstring, '$.f1') FROM tempView ``` Above is not an issue for the SELECT query statements. However, for CTAS, we hit the issue due to a bug in Hive metastore. Hive metastore does not like the column names containing commas and returned a confusing error message, like: ``` 17/04/26 23:12:56 ERROR [hive.log(397) -- main]: error in initSerDe: org.apache.hadoop.hive.serde2.SerDeException org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe: columns has 2 elements while columns.types has 1 elements! org.apache.hadoop.hive.serde2.SerDeException: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe: columns has 2 elements while columns.types has 1 elements! ``` Thus, this PR is to remove the comma from the alias names so that Spark SQL users can do CTAS for the function call containing commas but without user-given alias names. BTW, also add the description into the PR description.
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