}
@Test
public void testFieldCacheExpression() throws Exception {
BytesRefColumnReference bytesRefColumn = new BytesRefColumnReference(fieldName().name());
bytesRefColumn.startCollect(ctx);
bytesRefColumn.setNextReader(readerContext);
IndexSearcher searcher = new IndexSearcher(readerContext.reader());
TopDocs topDocs = searcher.search(new MatchAllDocsQuery(), 20);
int i = 0;
StringBuilder builder = new StringBuilder();