Package org.apache.druid.segment.nested
Class VariantColumnSerializer
- java.lang.Object
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- org.apache.druid.segment.nested.NestedCommonFormatColumnSerializer
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- org.apache.druid.segment.nested.VariantColumnSerializer
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- All Implemented Interfaces:
GenericColumnSerializer<StructuredData>
,Serializer
public class VariantColumnSerializer extends NestedCommonFormatColumnSerializer
Serializer for aNestedCommonFormatColumn
for single type arrays and mixed type columns, but not columns with nested data. IfvariantTypeSetByte
is set then the column has mixed types, which is added to the base metadata stored in the column file.
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Field Summary
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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
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Constructor Summary
Constructors Constructor Description VariantColumnSerializer(String name, Byte variantTypeSetByte, IndexSpec indexSpec, SegmentWriteOutMedium segmentWriteOutMedium, Closer closer)
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Method Summary
All Methods Instance Methods Concrete Methods 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 aSerializer.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
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Method Detail
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getColumnName
public String getColumnName()
- Specified by:
getColumnName
in classNestedCommonFormatColumnSerializer
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getGlobalLookup
public DictionaryIdLookup getGlobalLookup()
- Specified by:
getGlobalLookup
in classNestedCommonFormatColumnSerializer
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hasNulls
public boolean hasNulls()
- Specified by:
hasNulls
in classNestedCommonFormatColumnSerializer
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openDictionaryWriter
public void openDictionaryWriter() throws IOException
- Specified by:
openDictionaryWriter
in classNestedCommonFormatColumnSerializer
- Throws:
IOException
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open
public void open() throws IOException
- Throws:
IOException
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serializeDictionaries
public void serializeDictionaries(Iterable<String> strings, Iterable<Long> longs, Iterable<Double> doubles, Iterable<int[]> arrays) throws IOException
- Specified by:
serializeDictionaries
in classNestedCommonFormatColumnSerializer
- Throws:
IOException
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serialize
public void serialize(ColumnValueSelector<? extends StructuredData> selector) throws IOException
- Throws:
IOException
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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 aSerializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher)
call.
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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
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