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

Example 1 with StructType

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

the class ThriftSchemaConvertVisitor method visit.

@Override
public ConvertedField visit(StructType structType, State state) {
    // special care is taken when converting unions,
    // because we are actually both converting + projecting in
    // one pass, and unions need special handling when projecting.
    final boolean needsToKeepOneOfEachUnion = keepOneOfEachUnion && isUnion(structType.getStructOrUnionType());
    boolean hasSentinelUnionColumns = false;
    boolean hasNonSentinelUnionColumns = false;
    List<Type> convertedChildren = new ArrayList<Type>();
    for (ThriftField child : structType.getChildren()) {
        State childState = new State(state.path.push(child), getRepetition(child), child.getName());
        ConvertedField converted = child.getType().accept(this, childState);
        if (!converted.isKeep() && needsToKeepOneOfEachUnion) {
            // user is not keeping this "kind" of union, but we still need
            // to keep at least one of the primitives of this union around.
            // in order to know what "kind" of union each record is.
            // TODO: in the future, we should just filter these records out instead
            // re-do the recursion, with a new projection filter that keeps only
            // the first primitive it encounters
            ConvertedField firstPrimitive = child.getType().accept(new ThriftSchemaConvertVisitor(new KeepOnlyFirstPrimitiveFilter(), true, keepOneOfEachUnion), childState);
            convertedChildren.add(firstPrimitive.asKeep().getType().withId(child.getFieldId()));
            hasSentinelUnionColumns = true;
        }
        if (converted.isSentinelUnion()) {
            // child field is a sentinel union that we should drop if possible
            if (childState.repetition == REQUIRED) {
                // but this field is required, so we may still need it
                convertedChildren.add(converted.asSentinelUnion().getType().withId(child.getFieldId()));
                hasSentinelUnionColumns = true;
            }
        } else if (converted.isKeep()) {
            // user has selected this column, so we keep it.
            convertedChildren.add(converted.asKeep().getType().withId(child.getFieldId()));
            hasNonSentinelUnionColumns = true;
        }
    }
    if (!hasNonSentinelUnionColumns && hasSentinelUnionColumns) {
        // we may not be able to, so tag this as a sentinel.
        return new SentinelUnion(state.path, new GroupType(state.repetition, state.name, convertedChildren));
    }
    if (hasNonSentinelUnionColumns) {
        // user requested some of the fields of this struct, so we keep the struct
        return new Keep(state.path, new GroupType(state.repetition, state.name, convertedChildren));
    } else {
        // user requested none of the fields of this struct, so we drop it
        return new Drop(state.path);
    }
}

Example 2 with StructType

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

the class ThriftMetaData method fromExtraMetaData.

/**
 * Reads ThriftMetadata from the parquet file footer.
 *
 * @param extraMetaData  extraMetaData field of the parquet footer
 * @return the ThriftMetaData used to write a data file
 */
public static ThriftMetaData fromExtraMetaData(Map<String, String> extraMetaData) {
    final String thriftClassName = extraMetaData.get(THRIFT_CLASS);
    final String thriftDescriptorString = extraMetaData.get(THRIFT_DESCRIPTOR);
    if (thriftClassName == null || thriftDescriptorString == null) {
        return null;
    }
    final StructType descriptor = parseDescriptor(thriftDescriptorString);
    return new ThriftMetaData(thriftClassName, descriptor);
}

Example 3 with StructType

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

the class TestThriftToPigCompatibility method validateSameTupleAsEB.

/**
 * <ul> steps:
 * <li>Writes using the thrift mapping
 * <li>Reads using the pig mapping
 * <li>Use Elephant bird to convert from thrift to pig
 * <li>Check that both transformations give the same result
 * @param o the object to convert
 * @throws TException
 */
public static <T extends TBase<?, ?>> void validateSameTupleAsEB(T o) throws TException {
    final ThriftSchemaConverter thriftSchemaConverter = new ThriftSchemaConverter();
    @SuppressWarnings("unchecked") final Class<T> class1 = (Class<T>) o.getClass();
    final MessageType schema = thriftSchemaConverter.convert(class1);
    final StructType structType = ThriftSchemaConverter.toStructType(class1);
    final ThriftToPig<T> thriftToPig = new ThriftToPig<T>(class1);
    final Schema pigSchema = thriftToPig.toSchema();
    final TupleRecordMaterializer tupleRecordConverter = new TupleRecordMaterializer(schema, pigSchema, true);
    RecordConsumer recordConsumer = new ConverterConsumer(tupleRecordConverter.getRootConverter(), schema);
    final MessageColumnIO columnIO = new ColumnIOFactory().getColumnIO(schema);
    ParquetWriteProtocol p = new ParquetWriteProtocol(new RecordConsumerLoggingWrapper(recordConsumer), columnIO, structType);
    o.write(p);
    final Tuple t = tupleRecordConverter.getCurrentRecord();
    final Tuple expected = thriftToPig.getPigTuple(o);
    assertEquals(expected.toString(), t.toString());
    final MessageType filtered = new PigSchemaConverter().filter(schema, pigSchema);
    assertEquals(schema.toString(), filtered.toString());
}

Example 4 with StructType

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

the class TestThriftSchemaConverter method testToThriftType.

@Test
public void testToThriftType() throws Exception {
    final StructType converted = ThriftSchemaConverter.toStructType(AddressBook.class);
    final String json = converted.toJSON();
    final ThriftType fromJSON = StructType.fromJSON(json);
    assertEquals(json, fromJSON.toJSON());
}

Example 5 with StructType

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

the class TestThriftType method testParseUnionInfo.

@Test
public void testParseUnionInfo() throws Exception {
    StructType st = (StructType) StructType.fromJSON("{\"id\": \"STRUCT\", \"children\":[], \"structOrUnionType\": \"UNION\"}");
    assertEquals(st.getStructOrUnionType(), StructOrUnionType.UNION);
    st = (StructType) StructType.fromJSON("{\"id\": \"STRUCT\", \"children\":[], \"structOrUnionType\": \"STRUCT\"}");
    assertEquals(st.getStructOrUnionType(), StructOrUnionType.STRUCT);
    st = (StructType) StructType.fromJSON("{\"id\": \"STRUCT\", \"children\":[]}");
    assertEquals(st.getStructOrUnionType(), StructOrUnionType.UNKNOWN);
    st = (StructType) StructType.fromJSON("{\"id\": \"STRUCT\", \"children\":[], \"structOrUnionType\": \"UNKNOWN\"}");
    assertEquals(st.getStructOrUnionType(), StructOrUnionType.UNKNOWN);
}