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

Example 41 with SqlNullable

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

the class JsonFunctions method jsonArrayContains.

@SqlNullable
@ScalarFunction
@SqlType(StandardTypes.BOOLEAN)
public static Boolean jsonArrayContains(@SqlType(StandardTypes.JSON) Slice json, @SqlType(StandardTypes.DOUBLE) double value) {
    if (!Doubles.isFinite(value)) {
        return false;
    }
    try (JsonParser parser = createJsonParser(JSON_FACTORY, json)) {
        if (parser.nextToken() != START_ARRAY) {
            return null;
        }
        while (true) {
            JsonToken token = parser.nextToken();
            if (token == null) {
                return null;
            }
            if (token == END_ARRAY) {
                return false;
            }
            parser.skipChildren();
            // noinspection FloatingPointEquality
            if ((token == VALUE_NUMBER_FLOAT) && (parser.getDoubleValue() == value) && (Doubles.isFinite(parser.getDoubleValue()))) {
                return true;
            }
        }
    } catch (IOException e) {
        return null;
    }
}

Example 42 with SqlNullable

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

the class HyperLogLogFunctions method scalarMerge.

@ScalarFunction("merge_hll")
@Description("merge the contents of an array of HyperLogLogs")
@SqlType(StandardTypes.HYPER_LOG_LOG)
@SqlNullable
public static Slice scalarMerge(@SqlType("array(HyperLogLog)") Block block) {
    if (block.getPositionCount() == 0) {
        return null;
    }
    HyperLogLog merged = null;
    int firstNonNullIndex = 0;
    while (firstNonNullIndex < block.getPositionCount() && block.isNull(firstNonNullIndex)) {
        firstNonNullIndex++;
    }
    if (firstNonNullIndex == block.getPositionCount()) {
        return null;
    }
    Slice initialSlice = block.getSlice(firstNonNullIndex, 0, block.getSliceLength(firstNonNullIndex));
    merged = HyperLogLog.newInstance(initialSlice);
    for (int i = firstNonNullIndex; i < block.getPositionCount(); i++) {
        Slice currentSlice = block.getSlice(i, 0, block.getSliceLength(i));
        if (!block.isNull(i)) {
            merged.mergeWith(HyperLogLog.newInstance(currentSlice));
        }
    }
    return merged.serialize();
}

Example 43 with SqlNullable

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

the class JoniRegexpReplaceLambdaFunction method regexpReplace.

@LiteralParameters("x")
@SqlType("varchar")
@SqlNullable
public Slice regexpReplace(@SqlType("varchar") Slice source, @SqlType(JoniRegexpType.NAME) Regex pattern, @SqlType("function(array(varchar), varchar(x))") UnaryFunctionInterface replaceFunction) {
    // If there is no match we can simply return the original source without doing copy.
    Matcher matcher = pattern.matcher(source.getBytes());
    if (matcher.search(0, source.length(), Option.DEFAULT) == -1) {
        return source;
    }
    SliceOutput output = new DynamicSliceOutput(source.length());
    // Prepare a BlockBuilder that will be used to create the target block
    // that will be passed to the lambda function.
    BlockBuilder blockBuilder = VARCHAR.createBlockBuilder(null, 0);
    int groupCount = pattern.numberOfCaptures();
    int appendPosition = 0;
    int nextStart = 0;
    do {
        // In such case, nextStart is last appendPosition + 1.
        if (matcher.getEnd() == matcher.getBegin()) {
            nextStart = matcher.getEnd() + 1;
        } else {
            nextStart = matcher.getEnd();
        }
        // Append the un-matched part
        Slice unmatched = source.slice(appendPosition, matcher.getBegin() - appendPosition);
        appendPosition = matcher.getEnd();
        output.appendBytes(unmatched);
        // Append the capturing groups to the target block that will be passed to lambda
        Region matchedRegion = matcher.getEagerRegion();
        for (int i = 1; i <= groupCount; i++) {
            // Add to the block builder if the matched region is not null. In Joni null is represented as [-1, -1]
            if (matchedRegion.beg[i] >= 0 && matchedRegion.end[i] >= 0) {
                VARCHAR.writeSlice(blockBuilder, source, matchedRegion.beg[i], matchedRegion.end[i] - matchedRegion.beg[i]);
            } else {
                blockBuilder.appendNull();
            }
        }
        Block target = blockBuilder.getRegion(blockBuilder.getPositionCount() - groupCount, groupCount);
        // Call the lambda function to replace the block, and append the result to output
        Slice replaced = (Slice) replaceFunction.apply(target);
        if (replaced == null) {
            // replacing a substring with null (unknown) makes the entire string null
            return null;
        }
        output.appendBytes(replaced);
    } while (matcher.search(nextStart, source.length(), Option.DEFAULT) != -1);
    // Append the last un-matched part
    output.writeBytes(source, appendPosition, source.length() - appendPosition);
    return output.slice();
}

Example 44 with SqlNullable

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

the class JsonFunctions method jsonArrayGet.

@SqlNullable
@ScalarFunction
@SqlType(StandardTypes.JSON)
public static Slice jsonArrayGet(@SqlType(StandardTypes.JSON) Slice json, @SqlType(StandardTypes.BIGINT) long index) {
    // this value cannot be converted to positive number
    if (index == Long.MIN_VALUE) {
        return null;
    }
    try (JsonParser parser = createJsonParser(MAPPING_JSON_FACTORY, json)) {
        if (parser.nextToken() != START_ARRAY) {
            return null;
        }
        List<String> tokens = null;
        if (index < 0) {
            tokens = new LinkedList<>();
        }
        long count = 0;
        while (true) {
            JsonToken token = parser.nextToken();
            if (token == null) {
                return null;
            }
            if (token == END_ARRAY) {
                if (tokens != null && count >= index * -1) {
                    return utf8Slice(tokens.get(0));
                }
                return null;
            }
            String arrayElement;
            if (token == START_OBJECT || token == START_ARRAY) {
                arrayElement = parser.readValueAsTree().toString();
            } else {
                arrayElement = parser.getValueAsString();
            }
            if (count == index) {
                return arrayElement == null ? null : utf8Slice(arrayElement);
            }
            if (tokens != null) {
                tokens.add(arrayElement);
                if (count >= index * -1) {
                    tokens.remove(0);
                }
            }
            count++;
        }
    } catch (IOException e) {
        return null;
    }
}

Example 45 with SqlNullable

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

the class ArrayAnyMatchFunction method anyMatchBlock.

@TypeParameter("T")
@TypeParameterSpecialization(name = "T", nativeContainerType = Block.class)
@SqlType(StandardTypes.BOOLEAN)
@SqlNullable
public static Boolean anyMatchBlock(@TypeParameter("T") Type elementType, @SqlType("array(T)") Block arrayBlock, @SqlType("function(T, boolean)") BlockToBooleanFunction function) {
    boolean hasNullResult = false;
    for (int i = 0; i < arrayBlock.getPositionCount(); i++) {
        Block element = null;
        if (!arrayBlock.isNull(i)) {
            element = (Block) elementType.getObject(arrayBlock, i);
        }
        Boolean match = function.apply(element);
        if (TRUE.equals(match)) {
            return true;
        }
        if (match == null) {
            hasNullResult = true;
        }
    }
    if (hasNullResult) {
        return null;
    }
    return false;
}