cloud-fan commented on code in PR #45470:
URL: https://github.com/apache/spark/pull/45470#discussion_r1522614586
##########
sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseLexer.g4:
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@@ -510,8 +511,13 @@ BIGDECIMAL_LITERAL
| DECIMAL_DIGITS EXPONENT? 'BD' {isValidDecimal()}?
;
+// Generalize the identifier to give a sensible INVALID_IDENTIFIER error
message:
+// * Unicode letters rather than a-z and A-Z only
+// * URI paths for table references using paths
+// We then narrow down to ANSI rules in exitUnquotedIdentifier() in the parser.
IDENTIFIER
- : (LETTER | DIGIT | '_')+
+ : (UNICODE_LETTER | DIGIT | '_')+
+ | UNICODE_LETTER+ '://' (UNICODE_LETTER | DIGIT | '_' | '/' | '-' | '.' |
'?' | '=' | '&' | '#' | '%')+
Review Comment:
oh, we are already using `'_'`, nvm...
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