fix(s3select): parse JSON source paths from SQL AST (#5559)

crates/s3select-api/src/query/parser.rs

@@ -14,9 +14,28 @@
 
 use std::collections::VecDeque;
 
+use datafusion::sql::sqlparser::dialect::Dialect;
+
 use super::ast::ExtStatement;
 use crate::QueryResult;
 
+#[derive(Debug, Default)]
+pub struct RustFsDialect;
+
+impl Dialect for RustFsDialect {
+    fn is_identifier_start(&self, ch: char) -> bool {
+        ch.is_alphabetic() || ch == '_' || ch == '#' || ch == '@'
+    }
+
+    fn is_identifier_part(&self, ch: char) -> bool {
+        ch.is_alphabetic() || ch.is_ascii_digit() || ch == '@' || ch == '$' || ch == '#' || ch == '_'
+    }
+
+    fn supports_group_by_expr(&self) -> bool {
+        true
+    }
+}
+
 pub trait Parser {
     fn parse(&self, sql: &str) -> QueryResult<VecDeque<ExtStatement>>;
 }