Hi community: Parsing sql fails, when meeting the identifier starting with number.
Here, test case: // org.apache.calcite.test.SqlToRelConverterTest @Test void testIdentifierStartWithNumber() { final String sql = "select 1_c1 from (select deptno as 1_c1 from emp)"; sql(sql).ok(); } It throws an exception as below: java.lang.RuntimeException: org.apache.calcite.sql.parser.SqlParseException: Encountered "1" at line 1, column 36. Was expecting one of: <QUOTED_STRING> ... <BRACKET_QUOTED_IDENTIFIER> ... <QUOTED_IDENTIFIER> ... <BACK_QUOTED_IDENTIFIER> ... <BIG_QUERY_BACK_QUOTED_IDENTIFIER> ... <HYPHENATED_IDENTIFIER> ... <IDENTIFIER> ... <UNICODE_QUOTED_IDENTIFIER> ... at org.apache.calcite.sql.parser.SqlParseException.writeReplace(SqlParseException.java:171) *Mysql supports this case, should calcite support it?* *Failed png in Calcite:* [image: image.png] *Successful png in MySql:* [image: image.png] Best XuRenhe