Package org.apache.druid.segment.nested

Class ScalarStringColumnSerializer

java.lang.Object

org.apache.druid.segment.nested.NestedCommonFormatColumnSerializer

org.apache.druid.segment.nested.ScalarNestedCommonFormatColumnSerializer<String>

org.apache.druid.segment.nested.ScalarStringColumnSerializer

All Implemented Interfaces:

GenericColumnSerializer<StructuredData>, Serializer

public class ScalarStringColumnSerializer
extends ScalarNestedCommonFormatColumnSerializer<String>

Serializer for a string NestedCommonFormatColumn that can be read with StringUtf8DictionaryEncodedColumn.

Field Summary

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

closedForWrite, closer, columnFormatSpec, columnNameBytes, dictionaryIdLookup, dictionarySerialized, dictionaryWriter, hasNulls, intermediateValueWriter, log, name, segmentWriteOutMedium, writeDictionary

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

NESTED_FIELD_PREFIX, RAW_FILE_NAME, V0

Constructor Summary

Constructors

Constructor	Description
ScalarStringColumnSerializer(String name, NestedCommonFormatColumnFormatSpec columnFormatSpec, SegmentWriteOutMedium segmentWriteOutMedium, Closer closer)

Method Summary

Modifier and Type	Method	Description
int	getCardinality()
void	openDictionaryWriter(File segmentBaseDir)
protected void	openValueColumnSerializer()	Called during ScalarNestedCommonFormatColumnSerializer.open() to allow opening any separate type specific value column serializers
protected int	processValue(Object rawValue)	Called during ScalarNestedCommonFormatColumnSerializer.serialize(ColumnValueSelector) to convert value to dictionary id.
void	serializeDictionaries(Iterable<String> strings, Iterable<Long> longs, Iterable<Double> doubles, Iterable<int[]> arrays)
protected void	writeDictionaryFile(FileSmoosher smoosher)
protected void	writeValueColumn(FileSmoosher smoosher)	Called during ScalarNestedCommonFormatColumnSerializer.writeTo(WritableByteChannel, FileSmoosher) to allow any type specific value column serializers to use the FileSmoosher to write stuff to places.

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

getColumnName, getDictionaryIdLookup, getSerializedSize, hasNulls, open, serialize, setDictionaryIdLookup, writeTo

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

computeFilenameBytes, copyFromTempSmoosh, serializeFields, writeInternal, writeV0Header

Methods inherited from class java.lang.Object

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

Constructor Details

ScalarStringColumnSerializer

public ScalarStringColumnSerializer(String name,
 NestedCommonFormatColumnFormatSpec columnFormatSpec,
 SegmentWriteOutMedium segmentWriteOutMedium,
 Closer closer)

Method Details

processValue

protected int processValue(@Nullable
 Object rawValue)

Description copied from class: ScalarNestedCommonFormatColumnSerializer

Called during ScalarNestedCommonFormatColumnSerializer.serialize(ColumnValueSelector) to convert value to dictionary id.

Implementations may optionally also serialize the value to a type specific value column if they opened one with ScalarNestedCommonFormatColumnSerializer.openValueColumnSerializer(), or do whatever else is useful to do while handling a single row value.

Specified by:

processValue in class ScalarNestedCommonFormatColumnSerializer<String>

openDictionaryWriter

public void openDictionaryWriter(File segmentBaseDir)
                          throws IOException

Specified by:

openDictionaryWriter in class NestedCommonFormatColumnSerializer

Throws:

IOException

openValueColumnSerializer

protected void openValueColumnSerializer()

Description copied from class: ScalarNestedCommonFormatColumnSerializer

Called during ScalarNestedCommonFormatColumnSerializer.open() to allow opening any separate type specific value column serializers

Specified by:

openValueColumnSerializer in class ScalarNestedCommonFormatColumnSerializer<String>

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

writeValueColumn

protected void writeValueColumn(FileSmoosher smoosher)

Description copied from class: ScalarNestedCommonFormatColumnSerializer

Called during ScalarNestedCommonFormatColumnSerializer.writeTo(WritableByteChannel, FileSmoosher) to allow any type specific value column serializers to use the FileSmoosher to write stuff to places.

Specified by:

writeValueColumn in class ScalarNestedCommonFormatColumnSerializer<String>

writeDictionaryFile

protected void writeDictionaryFile(FileSmoosher smoosher)
                            throws IOException

Specified by:

writeDictionaryFile in class ScalarNestedCommonFormatColumnSerializer<String>

Throws:

IOException

getCardinality

public int getCardinality()

Specified by:

getCardinality in class ScalarNestedCommonFormatColumnSerializer<String>