dssysolyatin commented on code in PR #3215:
URL: https://github.com/apache/calcite/pull/3215#discussion_r1199601084
##########
babel/src/main/codegen/config.fmpp:
##########
@@ -578,9 +578,14 @@ data: {
]
# Custom identifier token.
- # Example: "< IDENTIFIER: (<LETTER>|<DIGIT>)+ >".
- customIdentifierToken: "< IDENTIFIER: (<LETTER>|<DIGIT>)+ >"
-
+ #
+ # PostgreSQL allows letters with diacritical marks and non-Latin letters
+ # in the beginning of identifier and additionally dollar sign in the rest
of identifier.
+ # See
https://github.com/postgres/postgres/blob/master/src/backend/parser/scan.l
+ #
+ # MySQL allows digit in the beginning of identifier
+ customIdentifierToken: "< IDENTIFIER:
(<LETTER>|<DIGIT>|[\"\\200\"-\"\\377\"])
(<LETTER>|<DIGIT>|<DOLLAR>|[\"\\200\"-\"\\377\"])* >"
Review Comment:
@JiajunBernoulli
It is letters with diacritical marks and non-Latin letters.
From
https://github.com/postgres/postgres/blob/master/src/backend/parser/scan.l
```
ident_start [A-Za-z\200-\377_]
ident_cont [A-Za-z\200-\377_0-9\$]
identifier {ident_start}{ident_cont}*
```
I will rename jira ticket and add `diacritical marks and non-Latin letters`
to title. description has it already
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