Chunjun Xiao created SPARK-30618:
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Summary: Why does SparkSQL allow `WHERE` to be table alias?
Key: SPARK-30618
URL: https://issues.apache.org/jira/browse/SPARK-30618
Project: Spark
Issue Type: Question
Components: SQL
Affects Versions: 2.4.4
Reporter: Chunjun Xiao
An empty `WHERE` expression is valid in Spark SQL, as: `SELECT * FROM XXX
WHERE`. Here `WHERE` is parsed as the table alias.
I think this surprises most SQL users, as this is an invalid statement in some
SQL engines like MySQL.
I checked the source code, and found more keywords (in most SQL system) are
treated as `noReserved` and allowed to be table alias.
Could anyone please give the rationality behind this decision?
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