stevenzwu commented on code in PR #16174:
URL: https://github.com/apache/iceberg/pull/16174#discussion_r3290495769


##########
core/src/main/java/org/apache/iceberg/util/LocationUtil.java:
##########
@@ -57,4 +57,61 @@ public static String tableLocation(TableIdentifier 
tableIdentifier, boolean useU
       return tableIdentifier.name();
     }
   }
+
+  /**
+   * Returns true if the location contains a URI scheme (e.g. {@code s3:}, 
{@code hdfs:}, {@code
+   * file:}), per <a 
href="https://datatracker.ietf.org/doc/html/rfc3986#section-3.1";>RFC 3986
+   * section 3.1</a>.
+   */
+  private static boolean hasScheme(String location) {
+    for (int i = 0; i < location.length(); i += 1) {
+      char ch = location.charAt(i);
+      if (ch == ':') {
+        return i > 0;
+      }
+
+      if (!Character.isLetterOrDigit(ch) && ch != '+' && ch != '-' && ch != 
'.') {

Review Comment:
   if we want to be more strict RFC compliant. Per RFC 3986 section 3.1, the 
scheme should start with an alpha char
   
   ```
   scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
   ```



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