Examples with Literal io.crate.analyze.symbol.Literal used on opensource projects

Example 1 with Literal

use of io.crate.analyze.symbol.Literal in project crate by crate.

the class WhereClauseAnalyzer method tieBreakPartitionQueries.

private static WhereClause tieBreakPartitionQueries(EvaluatingNormalizer normalizer, Map<Symbol, List<Literal>> queryPartitionMap, WhereClause whereClause, TransactionContext transactionContext) throws UnsupportedOperationException {
    /*
         * Got multiple normalized queries which all could match.
         * This might be the case if one partition resolved to null
         *
         * e.g.
         *
         *  p = 1 and x = 2
         *
         * might lead to
         *
         *  null and x = 2
         *  true and x = 2
         *
         * At this point it is unknown if they really match.
         * In order to figure out if they could potentially match all conditions involving references are now set to true
         *
         *  null and true   -> can't match
         *  true and true   -> can match, can use this query + partition
         *
         * If there is still more than 1 query that can match it's not possible to execute the query :(
         */
    List<Tuple<Symbol, List<Literal>>> canMatch = new ArrayList<>();
    SymbolToTrueVisitor symbolToTrueVisitor = new SymbolToTrueVisitor();
    for (Map.Entry<Symbol, List<Literal>> entry : queryPartitionMap.entrySet()) {
        Symbol query = entry.getKey();
        List<Literal> partitions = entry.getValue();
        Symbol symbol = symbolToTrueVisitor.process(query, null);
        Symbol normalized = normalizer.normalize(symbol, transactionContext);
        assert normalized instanceof Literal : "after normalization and replacing all reference occurrences with true there must only be a literal left";
        Object value = ((Literal) normalized).value();
        if (value != null && (Boolean) value) {
            canMatch.add(new Tuple<>(query, partitions));
        }
    }
    if (canMatch.size() == 1) {
        Tuple<Symbol, List<Literal>> symbolListTuple = canMatch.get(0);
        WhereClause where = new WhereClause(symbolListTuple.v1(), whereClause.docKeys().orElse(null), new ArrayList<String>(symbolListTuple.v2().size()));
        where.partitions(symbolListTuple.v2());
        return where;
    }
    throw new UnsupportedOperationException("logical conjunction of the conditions in the WHERE clause which " + "involve partitioned columns led to a query that can't be executed.");
}

Example 2 with Literal

use of io.crate.analyze.symbol.Literal in project crate by crate.

the class WhereClauseAnalyzer method resolvePartitions.

private static WhereClause resolvePartitions(WhereClause whereClause, DocTableInfo tableInfo, Functions functions, TransactionContext transactionContext) {
    assert tableInfo.isPartitioned() : "table must be partitioned in order to resolve partitions";
    assert whereClause.partitions().isEmpty() : "partitions must not be analyzed twice";
    if (tableInfo.partitions().isEmpty()) {
        // table is partitioned but has no data / no partitions
        return WhereClause.NO_MATCH;
    }
    PartitionReferenceResolver partitionReferenceResolver = preparePartitionResolver(tableInfo.partitionedByColumns());
    EvaluatingNormalizer normalizer = new EvaluatingNormalizer(functions, RowGranularity.PARTITION, ReplaceMode.COPY, partitionReferenceResolver, null);
    Symbol normalized;
    Map<Symbol, List<Literal>> queryPartitionMap = new HashMap<>();
    for (PartitionName partitionName : tableInfo.partitions()) {
        for (PartitionExpression partitionExpression : partitionReferenceResolver.expressions()) {
            partitionExpression.setNextRow(partitionName);
        }
        normalized = normalizer.normalize(whereClause.query(), transactionContext);
        assert normalized != null : "normalizing a query must not return null";
        if (normalized.equals(whereClause.query())) {
            // no partition columns inside the where clause
            return whereClause;
        }
        boolean canMatch = WhereClause.canMatch(normalized);
        if (canMatch) {
            List<Literal> partitions = queryPartitionMap.get(normalized);
            if (partitions == null) {
                partitions = new ArrayList<>();
                queryPartitionMap.put(normalized, partitions);
            }
            partitions.add(Literal.of(partitionName.asIndexName()));
        }
    }
    if (queryPartitionMap.size() == 1) {
        Map.Entry<Symbol, List<Literal>> entry = Iterables.getOnlyElement(queryPartitionMap.entrySet());
        whereClause = new WhereClause(entry.getKey(), whereClause.docKeys().orElse(null), new ArrayList<String>(entry.getValue().size()));
        whereClause.partitions(entry.getValue());
        return whereClause;
    } else if (queryPartitionMap.size() > 0) {
        return tieBreakPartitionQueries(normalizer, queryPartitionMap, whereClause, transactionContext);
    } else {
        return WhereClause.NO_MATCH;
    }
}

Example 3 with Literal

use of io.crate.analyze.symbol.Literal in project crate by crate.

the class RelationAnalyzer method symbolFromSelectOutputReferenceOrExpression.

/**
     * <h2>resolve expression by also taking alias and ordinal-reference into account</h2>
     * <p>
     * <p>
     * in group by or order by clauses it is possible to reference anything in the
     * select list by using a number or alias
     * </p>
     * <p>
     * These are allowed:
     * <pre>
     *     select name as n  ... order by n
     *     select name  ... order by 1
     *     select name ... order by other_column
     * </pre>
     */
private Symbol symbolFromSelectOutputReferenceOrExpression(Expression expression, SelectAnalysis selectAnalysis, String clause, ExpressionAnalyzer expressionAnalyzer, ExpressionAnalysisContext expressionAnalysisContext) {
    Symbol symbol;
    if (expression instanceof QualifiedNameReference) {
        List<String> parts = ((QualifiedNameReference) expression).getName().getParts();
        if (parts.size() == 1) {
            symbol = getOneOrAmbiguous(selectAnalysis.outputMultiMap(), Iterables.getOnlyElement(parts));
            if (symbol != null) {
                return symbol;
            }
        }
    }
    symbol = expressionAnalyzer.convert(expression, expressionAnalysisContext);
    if (symbol.symbolType().isValueSymbol()) {
        Literal longLiteral;
        try {
            longLiteral = io.crate.analyze.symbol.Literal.convert(symbol, DataTypes.LONG);
        } catch (ClassCastException | IllegalArgumentException e) {
            throw new UnsupportedOperationException(String.format(Locale.ENGLISH, "Cannot use %s in %s clause", SymbolPrinter.INSTANCE.printSimple(symbol), clause));
        }
        symbol = ordinalOutputReference(selectAnalysis.outputSymbols(), longLiteral, clause);
    }
    return symbol;
}

Example 4 with Literal

use of io.crate.analyze.symbol.Literal in project crate by crate.

the class AnyLikeOperatorTest method anyLike.

private Boolean anyLike(String pattern, String... expressions) {
    Literal patternLiteral = Literal.of(pattern);
    Object[] value = new Object[expressions.length];
    for (int i = 0; i < expressions.length; i++) {
        value[i] = expressions[i] == null ? null : new BytesRef(expressions[i]);
    }
    Literal valuesLiteral = Literal.of(new ArrayType(DataTypes.STRING), value);
    AnyLikeOperator impl = (AnyLikeOperator) new AnyLikeOperator.AnyLikeResolver().getForTypes(Arrays.asList(DataTypes.STRING, valuesLiteral.valueType()));
    return impl.evaluate(patternLiteral, valuesLiteral);
}

Example 5 with Literal

use of io.crate.analyze.symbol.Literal in project crate by crate.

the class AnyLikeOperatorTest method testNegateLike.

@Test
public void testNegateLike() throws Exception {
    Literal patternLiteral = Literal.of("A");
    Literal valuesLiteral = Literal.of(new ArrayType(DataTypes.STRING), new Object[] { new BytesRef("A"), new BytesRef("B") });
    FunctionImplementation impl = new AnyLikeOperator.AnyLikeResolver().getForTypes(Arrays.asList(DataTypes.STRING, valuesLiteral.valueType()));
    Function anyLikeFunction = new Function(impl.info(), Arrays.<Symbol>asList(patternLiteral, valuesLiteral));
    Input<Boolean> normalized = (Input<Boolean>) impl.normalizeSymbol(anyLikeFunction, new TransactionContext(SessionContext.SYSTEM_SESSION));
    assertThat(normalized.value(), is(true));
    assertThat(new NotPredicate().evaluate(normalized), is(false));
}