question: private static String partitionSpecToName ( Map < String , String > spec ) { StringBuilder sb = new StringBuilder ( ) ; for ( Map . Entry < String , String > entry : spec . entrySet ( ) ) { if ( sb . length ( ) != 0 ) { sb . append ( "/" ) ; } sb . append ( entry . getKey ( ) + "=" + entry . getValue ( ) ) ; } return sb . toString ( ) ; }
target:  Converts a map of partition key-value pairs to a name. Note that special characters are not escaped unlike in production, and the order of the key is dictated by the iteration order for the map.