Examples with NullItem com.yahoo.prelude.query.NullItem used on opensource projects

Example 1 with NullItem

use of com.yahoo.prelude.query.NullItem in project vespa by vespa-engine.

the class RecallSearcherTestCase method testIgnoreEmptyProperty.

@Test
public void testIgnoreEmptyProperty() {
    RecallSearcher searcher = new RecallSearcher();
    Query query = new Query();
    Result result = new Execution(searcher, Execution.Context.createContextStub()).search(query);
    assertNull(result.hits().getError());
    assertTrue(query.getModel().getQueryTree().getRoot() instanceof NullItem);
}

Example 2 with NullItem

use of com.yahoo.prelude.query.NullItem in project vespa by vespa-engine.

the class YqlParser method buildUserInput.

@NonNull
private Item buildUserInput(OperatorNode<ExpressionOperator> ast) {
    // TODO add support for default arguments if property results in nothing
    List<OperatorNode<ExpressionOperator>> args = ast.getArgument(1);
    String wordData = getStringContents(args.get(0));
    Boolean allowEmpty = getAnnotation(ast, USER_INPUT_ALLOW_EMPTY, Boolean.class, Boolean.FALSE, "flag for allowing NullItem to be returned");
    if (allowEmpty && (wordData == null || wordData.isEmpty()))
        return new NullItem();
    String grammar = getAnnotation(ast, USER_INPUT_GRAMMAR, String.class, Query.Type.ALL.toString(), "grammar for handling user input");
    String defaultIndex = getAnnotation(ast, USER_INPUT_DEFAULT_INDEX, String.class, "default", "default index for user input terms");
    Language language = decideParsingLanguage(ast, wordData);
    Item item;
    if (USER_INPUT_RAW.equals(grammar)) {
        item = instantiateWordItem(defaultIndex, wordData, ast, null, SegmentWhen.NEVER, true, language);
    } else if (USER_INPUT_SEGMENT.equals(grammar)) {
        item = instantiateWordItem(defaultIndex, wordData, ast, null, SegmentWhen.ALWAYS, false, language);
    } else {
        item = parseUserInput(grammar, defaultIndex, wordData, language, allowEmpty);
        propagateUserInputAnnotations(ast, item);
    }
    return item;
}

Example 3 with NullItem

use of com.yahoo.prelude.query.NullItem in project vespa by vespa-engine.

the class VespaBackEndSearcher method search.

public Result search(Query query, Execution execution) {
    // query root should not be null here
    Item root = query.getModel().getQueryTree().getRoot();
    if (root == null || root instanceof NullItem) {
        return new Result(query, ErrorMessage.createNullQuery(query.getHttpRequest().getUri().toString()));
    }
    if (wantsRPCSummaryFill(query) && summaryNeedsQuery(query)) {
        return new Result(query, ErrorMessage.createInvalidQueryParameter("When using dispatch.summaries and your summary/rankprofile require the query, " + " you need to enable ranking.queryCache."));
    }
    QueryRewrite.optimizeByRestrict(query);
    QueryRewrite.optimizeAndNot(query);
    QueryRewrite.collapseSingleComposites(query);
    root = query.getModel().getQueryTree().getRoot();
    if (// root can become null after optimization
    root == null || root instanceof NullItem)
        return new Result(query);
    resolveDocumentDatabase(query);
    transformQuery(query);
    traceQuery(name, "search", query, query.getOffset(), query.getHits(), 1, Optional.empty());
    root = query.getModel().getQueryTree().getRoot();
    if (// root can become null after resolving and transformation?
    root == null || root instanceof NullItem)
        return new Result(query);
    QueryPacket queryPacket = QueryPacket.create(query);
    int compressionLimit = query.properties().getInteger(PACKET_COMPRESSION_LIMIT, 0);
    queryPacket.setCompressionLimit(compressionLimit);
    if (compressionLimit != 0)
        queryPacket.setCompressionType(query.properties().getString(PACKET_COMPRESSION_TYPE, "lz4"));
    if (isLoggingFine())
        getLogger().fine("made QueryPacket: " + queryPacket);
    Result result = null;
    CacheKey cacheKey = null;
    if (cacheControl.useCache(query)) {
        cacheKey = new CacheKey(queryPacket);
        result = getCached(cacheKey, queryPacket.getQueryPacketData(), query);
    }
    if (result == null) {
        result = doSearch2(query, queryPacket, cacheKey, execution);
        if (isLoggingFine())
            getLogger().fine("Result NOT retrieved from cache");
        if (query.getTraceLevel() >= 1)
            query.trace(getName() + " dispatch response: " + result, false, 1);
        result.trace(getName());
    }
    return result;
}

Example 4 with NullItem

use of com.yahoo.prelude.query.NullItem in project vespa by vespa-engine.

the class YqlParser method parseUserInput.

@NonNull
private Item parseUserInput(String grammar, String defaultIndex, String wordData, Language language, boolean allowNullItem) {
    Query.Type parseAs = Query.Type.getType(grammar);
    Parser parser = ParserFactory.newInstance(parseAs, environment);
    // perhaps not use already resolved doctypes, but respect source and restrict
    Item item = parser.parse(new Parsable().setQuery(wordData).addSources(docTypes).setLanguage(language).setDefaultIndexName(defaultIndex)).getRoot();
    // the null check should be unnecessary, but is there to avoid having to suppress null warnings
    if (!allowNullItem && (item == null || item instanceof NullItem))
        throw new IllegalArgumentException("Parsing '" + wordData + "' only resulted in NullItem.");
    if (// mark the language used, unless it's the default
    language != Language.ENGLISH)
        item.setLanguage(language);
    return item;
}

Example 5 with NullItem

use of com.yahoo.prelude.query.NullItem in project vespa by vespa-engine.

the class WashPhrasesTestCase method transformQuery.

private String transformQuery(String rawQuery) {
    Parser parser = ParserFactory.newInstance(Query.Type.ALL, new ParserEnvironment());
    Item root = parser.parse(new Parsable().setQuery(rawQuery)).getRoot();
    if (root instanceof NullItem) {
        return null;
    }
    return root.toString();
}