question: private String removeOptionalTableReference ( String name , QueryState state ) { if ( name . contains ( "." ) ) { String head = name . split ( "\\." ) [ 0 ] ; for ( QuerySource tr : state . getSources ( ) ) { if ( tr . getAlias ( ) != null && head . equals ( tr . getAlias ( ) ) ) { return name . substring ( name . indexOf ( '.' ) + 1 ) ; } else if ( head . equals ( tr . getSource ( ) ) ) { return name . substring ( name . indexOf ( '.' ) + 1 ) ; } } } return name ; }
target:  Removes any field references which have an index prefix such as index.field1.field2 which will become field1.field2