parquet-common/src/main/java/org/apache/parquet/glob/GlobExpander.java
public static List<String> expand(String globPattern) {
    return GlobExpanderImpl.expand(GlobParser.parse(globPattern));
  }
public static List<String> expand(String globPattern) {
    return GlobExpanderImpl.expand(GlobParser.parse(globPattern));
  }
public static List < String > expand ( String globPattern ) { return GlobExpanderImpl . expand ( GlobParser . parse ( globPattern ) ) ; }
Expands a string with braces ("{}") into all of its possible permutations.
We call anything inside of {} braces a "one-of" group.

The only special characters in this glob syntax are '}', '{' and ','

The top-level pattern must not contain any commas, but a "one-of" group separates
its elements with commas, and a one-of group may contain sub one-of groups.

For example:
start{a,b,c}end -&gt; startaend, startbend, startcend
start{a,{b,c},d} -&gt; startaend, startbend, startcend, startdend
{a,b,c} -&gt; a, b, c
start{a, b{x,y}} -&gt; starta, startbx, startby

@param globPattern a string in the format described above
@return a list of all the strings that would satisfy globPattern, including duplicates
Expands a string with braces ( {} ) into all of its possible permutations . We call anything inside of {} braces a one - of group .