Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/10723#discussion_r50084780
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/ExpressionParser.g
---
@@ -518,6 +527,10 @@ principalIdentifier
| QuotedIdentifier
;
+looseNonReserved
+ : nonReserved | KW_FROM | KW_TO
+ ;
+
--- End diff --
We are allowed to use `From` and `To` in CreateTableUsing command's
options. But we can't simply add them into `nonReserved` because by doing that
we mess other existing rules. So we create a `looseIdentifier` and
`looseNonReserved` here.
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