Github user clockfly commented on the issue:
https://github.com/apache/spark/pull/15006
@gatorsmile
We are not "more flexible than Hive". We are as flexible as Hive. With this
PR, we only treats a string as an IDENTIFIER if there is no ambiguity that it
can not be interpreted as a number token.
For example, after this fix:
```
scala> spark.sql("create table 3r") // allowed, 3r is not ambiguous
scala> spark.sql("create table 3M") // not allowed, as 3M is ambiguous, it
can also mean BYTELENGTH_LITERAL.
scala> spark.sql("create table 3L") // not allowed, as 3L is ambiguous, it
can also mean BIGINT_LITERAL.
```
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