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

Example 66 with Description

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

the class VarbinaryFunctions method reverse.

@Description("Reverse a given varbinary")
@ScalarFunction("reverse")
@SqlType(StandardTypes.VARBINARY)
public static Slice reverse(@SqlType("varbinary") Slice inputSlice) {
    if (inputSlice.length() == 0) {
        return EMPTY_SLICE;
    }
    int length = inputSlice.length();
    Slice reverse = Slices.allocate(length);
    for (int i = 0; i < length; i++) {
        reverse.setByte(i, inputSlice.getByte((length - 1) - i));
    }
    return reverse;
}

Example 67 with Description

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

the class SqlInvokedScalarFromAnnotationsParser method parseFunctionDefinition.

public static List<SqlInvokedFunction> parseFunctionDefinition(Class<?> clazz) {
    checkArgument(clazz.isAnnotationPresent(SqlInvokedScalarFunction.class), "Class is not annotated with SqlInvokedScalarFunction: %s", clazz.getName());
    SqlInvokedScalarFunction header = clazz.getAnnotation(SqlInvokedScalarFunction.class);
    Optional<String> description = Optional.ofNullable(clazz.getAnnotation(Description.class)).map(Description::value);
    return findScalarsInFunctionDefinitionClass(clazz).stream().map(method -> createSqlInvokedFunctions(method, Optional.of(header), description)).flatMap(List::stream).collect(toImmutableList());
}

Example 68 with Description

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

the class SqlInvokedScalarFromAnnotationsParser method createSqlInvokedFunctions.

private static List<SqlInvokedFunction> createSqlInvokedFunctions(Method method, Optional<SqlInvokedScalarFunction> header, Optional<String> description) {
    SqlInvokedScalarFunction functionHeader = header.orElse(method.getAnnotation(SqlInvokedScalarFunction.class));
    String functionDescription = description.orElse(method.isAnnotationPresent(Description.class) ? method.getAnnotation(Description.class).value() : "");
    TypeSignature returnType = parseTypeSignature(method.getAnnotation(SqlType.class).value());
    // Parameter
    checkCondition(!method.isAnnotationPresent(SqlParameter.class) || !method.isAnnotationPresent(SqlParameters.class), FUNCTION_IMPLEMENTATION_ERROR, "Function-defining method [%s] is annotated with both @SqlParameter and @SqlParameters", method);
    List<Parameter> parameters;
    if (method.isAnnotationPresent(SqlParameter.class)) {
        parameters = ImmutableList.of(getParameterFromAnnotation(method.getAnnotation(SqlParameter.class)));
    } else if (method.isAnnotationPresent(SqlParameters.class)) {
        parameters = stream(method.getAnnotation(SqlParameters.class).value()).map(SqlInvokedScalarFromAnnotationsParser::getParameterFromAnnotation).collect(toImmutableList());
    } else {
        parameters = ImmutableList.of();
    }
    // Routine characteristics
    RoutineCharacteristics routineCharacteristics = RoutineCharacteristics.builder().setLanguage(RoutineCharacteristics.Language.SQL).setDeterminism(functionHeader.deterministic() ? DETERMINISTIC : NOT_DETERMINISTIC).setNullCallClause(functionHeader.calledOnNullInput() ? CALLED_ON_NULL_INPUT : RETURNS_NULL_ON_NULL_INPUT).build();
    String body;
    try {
        body = (String) method.invoke(null);
    } catch (ReflectiveOperationException e) {
        throw new PrestoException(FUNCTION_IMPLEMENTATION_ERROR, format("Failed to get function body for method [%s]", method), e);
    }
    return Stream.concat(Stream.of(functionHeader.value()), stream(functionHeader.alias())).map(name -> new SqlInvokedFunction(QualifiedObjectName.valueOf(DEFAULT_NAMESPACE, name), parameters, returnType, functionDescription, routineCharacteristics, body, notVersioned())).collect(toImmutableList());
}

Example 69 with Description

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

the class MathFunctions method inverseWeibullCdf.

@Description("Inverse of Weibull cdf given a, b parameters and probability")
@ScalarFunction
@SqlType(StandardTypes.DOUBLE)
public static double inverseWeibullCdf(@SqlType(StandardTypes.DOUBLE) double a, @SqlType(StandardTypes.DOUBLE) double b, @SqlType(StandardTypes.DOUBLE) double p) {
    checkCondition(p >= 0 && p <= 1, INVALID_FUNCTION_ARGUMENT, "p must be in the interval [0, 1]");
    checkCondition(a > 0, INVALID_FUNCTION_ARGUMENT, "a must be greater than 0");
    checkCondition(b > 0, INVALID_FUNCTION_ARGUMENT, "b must be greater than 0");
    WeibullDistribution distribution = new WeibullDistribution(null, a, b, WeibullDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY);
    return distribution.inverseCumulativeProbability(p);
}

Example 70 with Description

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

the class MathFunctions method chiSquaredCdf.

@Description("ChiSquared cdf given the df parameter and value")
@ScalarFunction
@SqlType(StandardTypes.DOUBLE)
public static double chiSquaredCdf(@SqlType(StandardTypes.DOUBLE) double df, @SqlType(StandardTypes.DOUBLE) double value) {
    checkCondition(value >= 0, INVALID_FUNCTION_ARGUMENT, "value must non-negative");
    checkCondition(df > 0, INVALID_FUNCTION_ARGUMENT, "df must be greater than 0");
    ChiSquaredDistribution distribution = new ChiSquaredDistribution(null, df, ChiSquaredDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY);
    return distribution.cumulativeProbability(value);
}