protected RowStream assembleFullTextScan(FullTextScan textScan) {
RowStream stream = new RowStream();
FullTextQueryBuilder builder = new FullTextQueryBuilder(textScan.getIndex(),
schema.ais(),
planContext.getQueryContext());
FullTextQueryExpression queryExpression = assembleFullTextQuery(textScan.getQuery(),
builder);
stream.operator = builder.scanOperator(queryExpression, textScan.getLimit());
stream.rowType = stream.operator.rowType();
return stream;
}