alamb commented on code in PR #5625:
URL: https://github.com/apache/arrow-datafusion/pull/5625#discussion_r1149733225


##########
datafusion/common/Cargo.toml:
##########
@@ -44,10 +44,12 @@ arrow = { workspace = true, default-features = false }
 arrow-array = { version = "35.0.0", default-features = false, features = 
["chrono-tz"] }
 chrono = { version = "0.4", default-features = false }
 cranelift-module = { version = "0.92.0", optional = true }
+lazy_static = "1.4.0"

Review Comment:
   I think these are already dependencies of other datafusion crates so this 
doesn't increase our overall dependency footprint



##########
datafusion/common/src/column.rs:
##########
@@ -112,12 +115,21 @@ impl Column {
 
     /// Serialize column into a quoted flat name string
     pub fn quoted_flat_name(&self) -> String {
-        // TODO: quote identifiers only when special characters present
-        // see: https://github.com/apache/arrow-datafusion/issues/5523
         match &self.relation {
             Some(r) => {
-                format!("{}.{}", r.to_quoted_string(), 
quote_identifier(&self.name))
+                lazy_static! {
+                    static ref CAPTURE_VALID_RE: Regex =

Review Comment:
   This seems like we could do this via a combination of 
   https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii_digit
   https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii_lowercase
   https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii_uppercase



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