Examples with MapType org.apache.parquet.thrift.struct.ThriftType.MapType used on opensource projects

Example 1 with MapType

use of org.apache.parquet.thrift.struct.ThriftType.MapType in project parquet-mr by apache.

the class ThriftSchemaConvertVisitor method visit.

@Override
public ConvertedField visit(MapType mapType, State state) {
    ThriftField keyField = mapType.getKey();
    ThriftField valueField = mapType.getValue();
    State keyState = new State(state.path.push(keyField), REQUIRED, "key");
    // TODO: This is a bug! this should be REQUIRED but changing this will
    // break the the schema compatibility check against old data
    // Thrift does not support null / missing map values.
    State valueState = new State(state.path.push(valueField), OPTIONAL, "value");
    ConvertedField convertedKey = keyField.getType().accept(this, keyState);
    ConvertedField convertedValue = valueField.getType().accept(this, valueState);
    if (!convertedKey.isKeep()) {
        if (convertedValue.isKeep()) {
            throw new ThriftProjectionException("Cannot select only the values of a map, you must keep the keys as well: " + state.path);
        }
        // neither key nor value was requested
        return new Drop(state.path);
    }
    // NOTE: doProjections prevents us from infinite recursion here.
    if (doProjection) {
        ConvertedField fullConvKey = keyField.getType().accept(new ThriftSchemaConvertVisitor(FieldProjectionFilter.ALL_COLUMNS, false, keepOneOfEachUnion), keyState);
        if (!fullConvKey.asKeep().getType().equals(convertedKey.asKeep().getType())) {
            throw new ThriftProjectionException("Cannot select only a subset of the fields in a map key, " + "for path " + state.path);
        }
    }
    if (convertedValue.isKeep()) {
        // keep both key and value
        Type mapField = mapType(state.repetition, state.name, convertedKey.asKeep().getType(), convertedValue.asKeep().getType());
        return new Keep(state.path, mapField);
    }
    // keep only the key, not the value
    ConvertedField sentinelValue = valueField.getType().accept(new ThriftSchemaConvertVisitor(new KeepOnlyFirstPrimitiveFilter(), true, keepOneOfEachUnion), valueState);
    Type mapField = mapType(state.repetition, state.name, convertedKey.asKeep().getType(), // signals to mapType method to project the value
    sentinelValue.asKeep().getType());
    return new Keep(state.path, mapField);
}

Example 2 with MapType

use of org.apache.parquet.thrift.struct.ThriftType.MapType in project parquet-mr by apache.

the class ParquetWriteProtocol method getProtocol.

private TProtocol getProtocol(ThriftField field, ColumnIO columnIO, Events returnClause) {
    TProtocol p;
    final ThriftType type = field.getType();
    switch(type.getType()) {
        case STOP:
        case VOID:
        default:
            throw new UnsupportedOperationException("can't convert type of " + field);
        case BOOL:
        case BYTE:
        case DOUBLE:
        case I16:
        case I32:
        case I64:
        case STRING:
            p = new PrimitiveWriteProtocol((PrimitiveColumnIO) columnIO, returnClause);
            break;
        case STRUCT:
            p = new StructWriteProtocol((GroupColumnIO) columnIO, (StructType) type, returnClause);
            break;
        case MAP:
            p = new MapWriteProtocol((GroupColumnIO) columnIO, (MapType) type, returnClause);
            break;
        case SET:
            p = new ListWriteProtocol((GroupColumnIO) columnIO, ((SetType) type).getValues(), returnClause);
            break;
        case LIST:
            p = new ListWriteProtocol((GroupColumnIO) columnIO, ((ListType) type).getValues(), returnClause);
            break;
        case ENUM:
            p = new EnumWriteProtocol((PrimitiveColumnIO) columnIO, (EnumType) type, returnClause);
            break;
    }
    return p;
}

Example 3 with MapType

use of org.apache.parquet.thrift.struct.ThriftType.MapType in project parquet-mr by apache.

the class BufferedProtocolReadToWrite method readOneValue.

/**
 * @return true when all value is consumed, false when some values is ignored due to the field is not defined in expectedType
 * @throws TException
 */
private boolean readOneValue(TProtocol in, byte type, List<Action> buffer, ThriftType expectedType) throws TException {
    if (expectedType != null && expectedType.getType().getSerializedThriftType() != type) {
        throw new DecodingSchemaMismatchException("the data type does not match the expected thrift structure: expected " + expectedType + " got " + typeName(type));
    }
    boolean hasFieldsIgnored = false;
    switch(type) {
        case TType.LIST:
            hasFieldsIgnored = readOneList(in, buffer, (ListType) expectedType);
            break;
        case TType.MAP:
            hasFieldsIgnored = readOneMap(in, buffer, (MapType) expectedType);
            break;
        case TType.SET:
            hasFieldsIgnored = readOneSet(in, buffer, (SetType) expectedType);
            break;
        case TType.STRUCT:
            hasFieldsIgnored = readOneStruct(in, buffer, (StructType) expectedType);
            break;
        case TType.STOP:
            break;
        case TType.BOOL:
            final boolean bool = in.readBool();
            writeBoolAction(buffer, bool);
            break;
        case TType.BYTE:
            final byte b = in.readByte();
            writeByteAction(buffer, b);
            break;
        case TType.DOUBLE:
            final double d = in.readDouble();
            writeDoubleAction(buffer, d);
            break;
        case TType.I16:
            final short s = in.readI16();
            writeShortAction(buffer, s);
            break;
        // same as i32 => actually never seen in the protocol layer as enums are written as a i32 field
        case TType.ENUM:
        case TType.I32:
            final int i = in.readI32();
            checkEnum(expectedType, i);
            writeIntAction(buffer, i);
            break;
        case TType.I64:
            final long l = in.readI64();
            writeLongAction(buffer, l);
            break;
        case TType.STRING:
            final ByteBuffer bin = in.readBinary();
            writeStringAction(buffer, bin);
            break;
        case TType.VOID:
            break;
        default:
            throw new TException("Unknown type: " + type);
    }
    return hasFieldsIgnored;
}