Examples with SqlType com.facebook.presto.spi.function.SqlType used on opensource projects

Example 51 with SqlType

use of com.facebook.presto.spi.function.SqlType in project presto by prestodb.

the class JsonOperators method castToDouble.

@ScalarOperator(CAST)
@SqlNullable
@SqlType(DOUBLE)
public static Double castToDouble(@SqlType(JSON) Slice json) {
    try (JsonParser parser = createJsonParser(JSON_FACTORY, json)) {
        parser.nextToken();
        Double result;
        switch(parser.getCurrentToken()) {
            case VALUE_NULL:
                result = null;
                break;
            case VALUE_STRING:
                result = VarcharOperators.castToDouble(Slices.utf8Slice(parser.getText()));
                break;
            case VALUE_NUMBER_FLOAT:
                result = parser.getDoubleValue();
                break;
            case VALUE_NUMBER_INT:
                // An alternative is calling getLongValue and then BigintOperators.castToDouble.
                // It doesn't work as well because it can result in overflow and underflow exceptions for large integral numbers.
                result = parser.getDoubleValue();
                break;
            case VALUE_TRUE:
                result = BooleanOperators.castToDouble(true);
                break;
            case VALUE_FALSE:
                result = BooleanOperators.castToDouble(false);
                break;
            default:
                throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), DOUBLE));
        }
        // check no trailing token
        checkCondition(parser.nextToken() == null, INVALID_CAST_ARGUMENT, "Cannot cast input json to DOUBLE");
        return result;
    } catch (IOException e) {
        throw new PrestoException(INVALID_CAST_ARGUMENT, format("Cannot cast '%s' to %s", json.toStringUtf8(), DOUBLE));
    }
}

Example 52 with SqlType

use of com.facebook.presto.spi.function.SqlType in project presto by prestodb.

the class UrlFunctions method urlExtractParameter.

@SqlNullable
@Description("extract query parameter from url")
@ScalarFunction
@LiteralParameters({ "x", "y" })
@SqlType("varchar(x)")
public static Slice urlExtractParameter(@SqlType("varchar(x)") Slice url, @SqlType("varchar(y)") Slice parameterName) {
    URI uri = parseUrl(url);
    if ((uri == null) || (uri.getQuery() == null)) {
        return null;
    }
    Slice query = slice(uri.getQuery());
    String parameter = parameterName.toStringUtf8();
    Iterable<String> queryArgs = QUERY_SPLITTER.split(query.toStringUtf8());
    for (String queryArg : queryArgs) {
        Iterator<String> arg = ARG_SPLITTER.split(queryArg).iterator();
        if (arg.next().equals(parameter)) {
            if (arg.hasNext()) {
                return utf8Slice(arg.next());
            }
            // first matched key is empty
            return Slices.EMPTY_SLICE;
        }
    }
    // no key matched
    return null;
}

Example 53 with SqlType

use of com.facebook.presto.spi.function.SqlType in project presto by prestodb.

the class VarbinaryFunctions method xxhash64.

@Description("compute xxhash64 hash")
@ScalarFunction
@SqlType(StandardTypes.VARBINARY)
public static Slice xxhash64(@SqlType(StandardTypes.VARBINARY) Slice slice) {
    Slice hash = Slices.allocate(Long.BYTES);
    hash.setLong(0, Long.reverseBytes(XxHash64.hash(slice)));
    return hash;
}

Example 54 with SqlType

use of com.facebook.presto.spi.function.SqlType in project presto by prestodb.

the class SequenceFunction method sequenceTimestampYearToMonth.

@ScalarFunction("sequence")
@SqlType("array(timestamp)")
public static Block sequenceTimestampYearToMonth(ConnectorSession session, @SqlType(StandardTypes.TIMESTAMP) long start, @SqlType(StandardTypes.TIMESTAMP) long end, @SqlType(StandardTypes.INTERVAL_YEAR_TO_MONTH) long step) {
    checkCondition(step != 0, INVALID_FUNCTION_ARGUMENT, "interval must not be zero");
    checkCondition(step > 0 ? end >= start : end <= start, INVALID_FUNCTION_ARGUMENT, "sequence end value should be greater than or equal to start value if step is greater than zero otherwise end should be less than start");
    int length = toIntExact(diffTimestamp(session, MONTH, start, end) / step + 1);
    BlockBuilder blockBuilder = BIGINT.createBlockBuilder(new BlockBuilderStatus(), length);
    int value = 0;
    for (int i = 0; i < length; ++i) {
        BIGINT.writeLong(blockBuilder, DateTimeOperators.timestampPlusIntervalYearToMonth(session, start, value));
        value += step;
    }
    return blockBuilder.build();
}

Example 55 with SqlType

use of com.facebook.presto.spi.function.SqlType in project presto by prestodb.

the class StringFunctions method levenshteinDistance.

@Description("computes Levenshtein distance between two strings")
@ScalarFunction
@LiteralParameters({ "x", "y" })
@SqlType(StandardTypes.BIGINT)
public static long levenshteinDistance(@SqlType("varchar(x)") Slice left, @SqlType("varchar(y)") Slice right) {
    int[] leftCodePoints = castToCodePoints(left);
    int[] rightCodePoints = castToCodePoints(right);
    if (leftCodePoints.length < rightCodePoints.length) {
        int[] tempCodePoints = leftCodePoints;
        leftCodePoints = rightCodePoints;
        rightCodePoints = tempCodePoints;
    }
    if (rightCodePoints.length == 0) {
        return leftCodePoints.length;
    }
    checkCondition((leftCodePoints.length * (rightCodePoints.length - 1)) <= 1_000_000, INVALID_FUNCTION_ARGUMENT, "The combined inputs for Levenshtein distance are too large");
    int[] distances = new int[rightCodePoints.length];
    for (int i = 0; i < rightCodePoints.length; i++) {
        distances[i] = i + 1;
    }
    for (int i = 0; i < leftCodePoints.length; i++) {
        int leftUpDistance = distances[0];
        if (leftCodePoints[i] == rightCodePoints[0]) {
            distances[0] = i;
        } else {
            distances[0] = Math.min(i, distances[0]) + 1;
        }
        for (int j = 1; j < rightCodePoints.length; j++) {
            int leftUpDistanceNext = distances[j];
            if (leftCodePoints[i] == rightCodePoints[j]) {
                distances[j] = leftUpDistance;
            } else {
                distances[j] = Math.min(distances[j - 1], Math.min(leftUpDistance, distances[j])) + 1;
            }
            leftUpDistance = leftUpDistanceNext;
        }
    }
    return distances[rightCodePoints.length - 1];
}