rdblue commented on code in PR #10877:
URL: https://github.com/apache/iceberg/pull/10877#discussion_r1709885848


##########
core/src/main/java/org/apache/iceberg/rest/RESTUtil.java:
##########
@@ -215,8 +232,33 @@ public static String encodeNamespace(Namespace ns) {
    * @return a namespace
    */
   public static Namespace decodeNamespace(String encodedNs) {
-    Preconditions.checkArgument(encodedNs != null, "Invalid namespace: null");
-    String[] levels = 
Iterables.toArray(NAMESPACE_ESCAPED_SPLITTER.split(encodedNs), String.class);
+    return decodeNamespace(encodedNs, NAMESPACE_ESCAPED_SEPARATOR);
+  }
+
+  /**
+   * Takes in a string representation of a namespace as used for a URL 
parameter and returns the
+   * corresponding namespace.
+   *
+   * <p>See also {@link #encodeNamespace} for generating correctly formatted 
URLs.
+   *
+   * @param encodedNamespace a namespace to decode
+   * @param namespaceSeparator The namespace separator to use for decoding. 
This should be the same
+   *     separator that was used when calling {@link 
RESTUtil#encodeNamespace(Namespace, String)}
+   * @return a namespace
+   */
+  public static Namespace decodeNamespace(String encodedNamespace, String 
namespaceSeparator) {
+    Preconditions.checkArgument(encodedNamespace != null, "Invalid namespace: 
null");
+    Preconditions.checkArgument(
+        !Strings.isNullOrEmpty(namespaceSeparator), "Invalid namespace 
separator: null or empty");
+    String[] levels;
+
+    // for backwards compatibility

Review Comment:
   This isn't necessary if the client sends a specific `separator` in query 
params, right?



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