Package org.apache.druid.segment.nested

Class VariantColumnSerializer

java.lang.Object

org.apache.druid.segment.nested.NestedCommonFormatColumnSerializer

org.apache.druid.segment.nested.VariantColumnSerializer

All Implemented Interfaces:

GenericColumnSerializer<StructuredData>, Serializer

public class VariantColumnSerializer
extends NestedCommonFormatColumnSerializer

Serializer for a NestedCommonFormatColumn for single type arrays and mixed type columns, but not columns with nested data. If variantTypeSetByte is set then the column has mixed types, which is added to the base metadata stored in the column file.

Field Summary

Fields inherited from class org.apache.druid.segment.nested.NestedCommonFormatColumnSerializer

ARRAY_DICTIONARY_FILE_NAME, ARRAY_ELEMENT_BITMAP_INDEX_FILE_NAME, ARRAY_ELEMENT_DICTIONARY_FILE_NAME, BITMAP_INDEX_FILE_NAME, DOUBLE_DICTIONARY_FILE_NAME, DOUBLE_VALUE_COLUMN_FILE_NAME, ENCODED_VALUE_COLUMN_FILE_NAME, LONG_DICTIONARY_FILE_NAME, LONG_VALUE_COLUMN_FILE_NAME, NESTED_FIELD_PREFIX, NULL_BITMAP_FILE_NAME, RAW_FILE_NAME, STRING_DICTIONARY_FILE_NAME, V0

Constructor Summary

Constructors

Constructor	Description
VariantColumnSerializer(String name, Byte variantTypeSetByte, IndexSpec indexSpec, SegmentWriteOutMedium segmentWriteOutMedium, Closer closer)

Method Summary

Modifier and Type	Method	Description
String	getColumnName()
DictionaryIdLookup	getGlobalLookup()
long	getSerializedSize()	Returns the number of bytes, that this Serializer will write to the output _channel_ (not smoosher) on a Serializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher) call.
boolean	hasNulls()
void	open()
void	openDictionaryWriter()
void	serialize(ColumnValueSelector<? extends StructuredData> selector)
void	serializeDictionaries(Iterable<String> strings, Iterable<Long> longs, Iterable<Double> doubles, Iterable<int[]> arrays)
void	writeTo(WritableByteChannel channel, FileSmoosher smoosher)	Writes serialized form of this object to the given channel.

Methods inherited from class org.apache.druid.segment.nested.NestedCommonFormatColumnSerializer

computeFilenameBytes, getInternalFileName, serializeFields, writeInternal, writeInternal, writeV0Header

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VariantColumnSerializer

public VariantColumnSerializer(String name,
                               @Nullable
                               Byte variantTypeSetByte,
                               IndexSpec indexSpec,
                               SegmentWriteOutMedium segmentWriteOutMedium,
                               Closer closer)

Method Detail

getColumnName

public String getColumnName()

Specified by:

getColumnName in class NestedCommonFormatColumnSerializer

getGlobalLookup

public DictionaryIdLookup getGlobalLookup()

Specified by:

getGlobalLookup in class NestedCommonFormatColumnSerializer

hasNulls

public boolean hasNulls()

Specified by:

hasNulls in class NestedCommonFormatColumnSerializer

openDictionaryWriter

public void openDictionaryWriter()
                          throws IOException

Specified by:

openDictionaryWriter in class NestedCommonFormatColumnSerializer

Throws:

IOException

open

public void open()
          throws IOException

Throws:

IOException

serializeDictionaries

public void serializeDictionaries(Iterable<String> strings,
                                  Iterable<Long> longs,
                                  Iterable<Double> doubles,
                                  Iterable<int[]> arrays)
                           throws IOException

Specified by:

serializeDictionaries in class NestedCommonFormatColumnSerializer

Throws:

IOException

serialize

public void serialize(ColumnValueSelector<? extends StructuredData> selector)
               throws IOException

Throws:

IOException

getSerializedSize

public long getSerializedSize()

Description copied from interface: Serializer

Returns the number of bytes, that this Serializer will write to the output _channel_ (not smoosher) on a Serializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher) call.

writeTo

public void writeTo(WritableByteChannel channel,
                    FileSmoosher smoosher)
             throws IOException

Description copied from interface: Serializer

Writes serialized form of this object to the given channel. If parallel data streams are needed, they could be created with the provided smoosher.

Throws:

IOException