ByteArrayInputStream stream
= new ByteArrayInputStream(schemaString.getBytes()) ;
QueryParser queryParser = new QueryParser(stream) ;
Schema schema = null ;
try {
schema = queryParser.TupleSchema() ;
Schema.setSchemaDefaultType(schema, DataType.BYTEARRAY);
// set all the [NoAlias] to null
for(int i=0; i < dummyAliasCounter; i++) {
replaceAliasByNull(schema, DUMMY_ALIAS_PREFIX + i) ;