parquet-common/src/main/java/org/apache/parquet/Strings.java
public static String join(String[] s, String on) {
    return join(Arrays.asList(s), on);
  }
public static String join(String[] s, String on) {
    return join(Arrays.asList(s), on);
  }
public static String join ( String [ ] s , String on ) { return join ( Arrays . asList ( s ) , on ) ; }
Join an Array of Strings into a single string with a delimiter.
For example, join(new String[] {"foo","","bar","x"}, "|") would return
"foo||bar|x"

@param s an iterable of strings
@param on the delimiter
@return a single joined string
Join an Array of Strings into a single string with a delimiter . For example join ( new String [] { foo bar x } | ) would return foo||bar|x