fix: trim object preix error (#17636)

* fix trim_object_prefix

* add ut

* fix

Author: SkyFan2002

src/query/storages/common/table_meta/src/meta/utils.rs

@@ -158,7 +158,7 @@ pub fn parse_storage_prefix(options: &BTreeMap<String, String>, table_id: u64) -
 pub fn trim_object_prefix(key: &str) -> &str {
     // if object key (the file_name/stem part only) starts with a char which is larger
     // than 'f', strip it off
-    if key > "f" {
+    if !key.is_empty() && key.chars().next().unwrap() > 'f' {
         &key[1..]
     } else {
         key
@@ -196,6 +196,10 @@ mod tests {
                 "bucket/root/115/122/_b/0191114d30fd78b89fae8e5c88327725_v2.parquet",
                 "0191114d30fd78b89fae8e5c88327725",
             ),
+            (
+                "bucket/root/115/122/_b/f191114d30fd78b89fae8e5c88327725_v2.parquet",
+                "f191114d30fd78b89fae8e5c88327725",
+            ),
         ];
 
         for (input, expected) in test_cases {