org.apache.druid.segment

Class FloatDimensionIndexer

java.lang.Object

org.apache.druid.segment.FloatDimensionIndexer

All Implemented Interfaces:

DimensionIndexer<Float,Float,Float>

public class FloatDimensionIndexer
extends Object
implements DimensionIndexer<Float,Float,Float>

Field Summary

Fields

Modifier and Type	Field and Description
static Comparator<Float>	FLOAT_COMPARATOR

Constructor Summary

Constructors

Constructor and Description
FloatDimensionIndexer()

Method Summary

Modifier and Type	Method and Description
boolean	checkUnsortedEncodedKeyComponentsEqual(Float lhs, Float rhs) Check if two row value arrays from Row keys are equal.
int	compareUnsortedEncodedKeyComponents(Float lhs, Float rhs) Compares the row values for this DimensionIndexer's dimension from a Row key.
Object	convertUnsortedEncodedKeyComponentToActualList(Float key) Given a row value array from a Row key, as described in the documentation for DimensionIndexer.compareUnsortedEncodedKeyComponents(EncodedKeyComponentType, EncodedKeyComponentType), convert the unsorted encoded values to a list of actual values.
ColumnValueSelector	convertUnsortedValuesToSorted(ColumnValueSelector selectorWithUnsortedValues) Converts dictionary-encoded row values from unspecified (random) encoding order, to sorted encoding.
long	estimateEncodedKeyComponentSize(Float key) Gives the estimated size in bytes for the given key
void	fillBitmapsFromUnsortedEncodedKeyComponent(Float key, int rowNum, MutableBitmap[] bitmapIndexes, BitmapFactory factory) Helper function for building bitmap indexes for integer-encoded dimensions.
int	getCardinality() Get the cardinality of this dimension's values.
Float	getMaxValue() Get the maximum dimension value seen by this indexer.
Float	getMinValue() Get the minimum dimension value seen by this indexer.
CloseableIndexed<Float>	getSortedIndexedValues() Returns an indexed structure of this dimension's sorted actual values.
int	getUnsortedEncodedKeyComponentHashCode(Float key) Given a row value array from a Row key, generate a hashcode.
Float	getUnsortedEncodedValueFromSorted(Float sortedIntermediateValue) Given an encoded value that was ordered by associated actual value, return the equivalent encoded value ordered by time of ingestion.
ColumnValueSelector<?>	makeColumnValueSelector(IncrementalIndexRowHolder currEntry, IncrementalIndex.DimensionDesc desc) Return an object used to read values from this indexer's column.
DimensionSelector	makeDimensionSelector(DimensionSpec spec, IncrementalIndexRowHolder currEntry, IncrementalIndex.DimensionDesc desc) Return an object used to read values from this indexer's column as Strings.
Float	processRowValsToUnsortedEncodedKeyComponent(Object dimValues, boolean reportParseExceptions) Given a single row value or list of row values (for multi-valued dimensions), update any internal data structures with the ingested values and return the row values as an array to be used within a Row key.
void	setSparseIndexed() This method will be called while building an IncrementalIndex whenever a known dimension column (either through an explicit schema on the ingestion spec, or auto-discovered while processing rows) is absent in any row that is processed, to allow an indexer to account for any missing rows if necessary.

Methods inherited from class java.lang.Object

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

Field Detail

FLOAT_COMPARATOR

public static final Comparator<Float> FLOAT_COMPARATOR

Constructor Detail

FloatDimensionIndexer

public FloatDimensionIndexer()

Method Detail

processRowValsToUnsortedEncodedKeyComponent

public Float processRowValsToUnsortedEncodedKeyComponent(@Nullable
                                                         Object dimValues,
                                                         boolean reportParseExceptions)

Description copied from interface: DimensionIndexer

Given a single row value or list of row values (for multi-valued dimensions), update any internal data structures with the ingested values and return the row values as an array to be used within a Row key. For example, the dictionary-encoded String-type column will return an int[] containing a dictionary ID. The value within the returned array should be encoded if applicable, i.e. as instances of EncodedType. NOTE: This function can change the internal state of the DimensionIndexer.

Specified by:

processRowValsToUnsortedEncodedKeyComponent in interface DimensionIndexer<Float,Float,Float>

Parameters:

dimValues - Single row val to process

Returns:

An array containing an encoded representation of the input row value.

setSparseIndexed

public void setSparseIndexed()

Description copied from interface: DimensionIndexer

This method will be called while building an IncrementalIndex whenever a known dimension column (either through an explicit schema on the ingestion spec, or auto-discovered while processing rows) is absent in any row that is processed, to allow an indexer to account for any missing rows if necessary. Useful so that a string DimensionSelector built on top of an IncrementalIndex may accurately report DimensionDictionarySelector.nameLookupPossibleInAdvance() by allowing it to track if it has any implicit null valued rows. At index persist/merge time all missing columns for a row will be explicitly replaced with the value appropriate null or default value.

Specified by:

setSparseIndexed in interface DimensionIndexer<Float,Float,Float>

estimateEncodedKeyComponentSize

public long estimateEncodedKeyComponentSize(Float key)

Description copied from interface: DimensionIndexer

Gives the estimated size in bytes for the given key

Specified by:

estimateEncodedKeyComponentSize in interface DimensionIndexer<Float,Float,Float>

Parameters:

key - dimension value array from a TimeAndDims key

Returns:

the estimated size in bytes of the key

getUnsortedEncodedValueFromSorted

public Float getUnsortedEncodedValueFromSorted(Float sortedIntermediateValue)

Description copied from interface: DimensionIndexer

Given an encoded value that was ordered by associated actual value, return the equivalent encoded value ordered by time of ingestion. Using the example in the class description: getUnsortedEncodedValueFromSorted(2) would return 0

Specified by:

getUnsortedEncodedValueFromSorted in interface DimensionIndexer<Float,Float,Float>

Parameters:

sortedIntermediateValue - value to convert

Returns:

converted value

getSortedIndexedValues

public CloseableIndexed<Float> getSortedIndexedValues()

Description copied from interface: DimensionIndexer

Returns an indexed structure of this dimension's sorted actual values. The integer IDs represent the ordering of the sorted values. Using the example in the class description: "Apple"=0, "Hello"=1, "World"=2

Specified by:

getSortedIndexedValues in interface DimensionIndexer<Float,Float,Float>

Returns:

Sorted index of actual values

getMinValue

public Float getMinValue()

Description copied from interface: DimensionIndexer

Get the minimum dimension value seen by this indexer. NOTE: On an in-memory segment (IncrementalIndex), we can determine min/max values by looking at the stream of row values seen in calls to processSingleRowValToIndexKey(). However, on a disk-backed segment (QueryableIndex), the numeric dimensions do not currently have any supporting index structures that can be used to efficiently determine min/max values. When numeric dimension support is added, the segment format should be changed to store min/max values, to avoid performing a full-column scan to determine these values for numeric dims.

Specified by:

getMinValue in interface DimensionIndexer<Float,Float,Float>

Returns:

min value

getMaxValue

public Float getMaxValue()

Description copied from interface: DimensionIndexer

Get the maximum dimension value seen by this indexer.

Specified by:

getMaxValue in interface DimensionIndexer<Float,Float,Float>

Returns:

max value

getCardinality

public int getCardinality()

Description copied from interface: DimensionIndexer

Get the cardinality of this dimension's values.

Specified by:

getCardinality in interface DimensionIndexer<Float,Float,Float>

Returns:

value cardinality

makeDimensionSelector

public DimensionSelector makeDimensionSelector(DimensionSpec spec,
                                               IncrementalIndexRowHolder currEntry,
                                               IncrementalIndex.DimensionDesc desc)

Description copied from interface: DimensionIndexer

Return an object used to read values from this indexer's column as Strings.

Specified by:

makeDimensionSelector in interface DimensionIndexer<Float,Float,Float>

Parameters:

spec - Specifies the output name of a dimension and any extraction functions to be applied.

currEntry - Provides access to the current Row object in the Cursor

desc - Descriptor object for this dimension within an IncrementalIndex

Returns:

A new object that reads rows from currEntry

makeColumnValueSelector

public ColumnValueSelector<?> makeColumnValueSelector(IncrementalIndexRowHolder currEntry,
                                                      IncrementalIndex.DimensionDesc desc)

Description copied from interface: DimensionIndexer

Return an object used to read values from this indexer's column.

Specified by:

makeColumnValueSelector in interface DimensionIndexer<Float,Float,Float>

Parameters:

currEntry - Provides access to the current Row object in the Cursor

desc - Descriptor object for this dimension within an IncrementalIndex

Returns:

A new object that reads rows from currEntry

compareUnsortedEncodedKeyComponents

public int compareUnsortedEncodedKeyComponents(@Nullable
                                               Float lhs,
                                               @Nullable
                                               Float rhs)

Description copied from interface: DimensionIndexer

Compares the row values for this DimensionIndexer's dimension from a Row key. The dimension value arrays within a Row key always use the "unsorted" ordering for encoded values. The row values are passed to this function as an Object, the implementer should cast them to the type appropriate for this dimension. For example, a dictionary encoded String implementation would cast the Objects as int[] arrays. When comparing, if the two arrays have different lengths, the shorter array should be ordered first. Otherwise, the implementer of this function should iterate through the unsorted encoded values, converting them to their actual type (e.g., performing a dictionary lookup for a dict-encoded String dimension), and comparing the actual values until a difference is found. Refer to StringDimensionIndexer.compareUnsortedEncodedKeyComponents() for a reference implementation. The comparison rules used by this method should match the rules used by DimensionHandler.getEncodedValueSelectorComparator(), otherwise incorrect ordering/merging of rows can occur during ingestion, causing issues such as imperfect rollup.

Specified by:

compareUnsortedEncodedKeyComponents in interface DimensionIndexer<Float,Float,Float>

Parameters:

lhs - dimension value array from a Row key

rhs - dimension value array from a Row key

Returns:

comparison of the two arrays

checkUnsortedEncodedKeyComponentsEqual

public boolean checkUnsortedEncodedKeyComponentsEqual(@Nullable
                                                      Float lhs,
                                                      @Nullable
                                                      Float rhs)

Description copied from interface: DimensionIndexer

Check if two row value arrays from Row keys are equal.

Specified by:

checkUnsortedEncodedKeyComponentsEqual in interface DimensionIndexer<Float,Float,Float>

Parameters:

lhs - dimension value array from a Row key

rhs - dimension value array from a Row key

Returns:

true if the two arrays are equal

getUnsortedEncodedKeyComponentHashCode

public int getUnsortedEncodedKeyComponentHashCode(@Nullable
                                                  Float key)

Description copied from interface: DimensionIndexer

Given a row value array from a Row key, generate a hashcode.

Specified by:

getUnsortedEncodedKeyComponentHashCode in interface DimensionIndexer<Float,Float,Float>

Parameters:

key - dimension value array from a Row key

Returns:

hashcode of the array

convertUnsortedEncodedKeyComponentToActualList

public Object convertUnsortedEncodedKeyComponentToActualList(Float key)

Description copied from interface: DimensionIndexer

Given a row value array from a Row key, as described in the documentation for DimensionIndexer.compareUnsortedEncodedKeyComponents(EncodedKeyComponentType, EncodedKeyComponentType), convert the unsorted encoded values to a list of actual values. If the key has one element, this method should return a single Object instead of a list.

Specified by:

convertUnsortedEncodedKeyComponentToActualList in interface DimensionIndexer<Float,Float,Float>

Parameters:

key - dimension value array from a Row key

Returns:

single value or list containing the actual values corresponding to the encoded values in the input array

convertUnsortedValuesToSorted

public ColumnValueSelector convertUnsortedValuesToSorted(ColumnValueSelector selectorWithUnsortedValues)

Description copied from interface: DimensionIndexer

Converts dictionary-encoded row values from unspecified (random) encoding order, to sorted encoding. This step is needed to be able to correctly map per-segment encoded values to global values on the next conversion step, DimensionMerger.convertSortedSegmentRowValuesToMergedRowValues(int, org.apache.druid.segment.ColumnValueSelector). The latter method requires sorted encoding values on the input, because DimensionMerger.writeMergedValueDictionary(java.util.List<org.apache.druid.segment.IndexableAdapter>) takes sorted lookups as it's input.

Specified by:

convertUnsortedValuesToSorted in interface DimensionIndexer<Float,Float,Float>

fillBitmapsFromUnsortedEncodedKeyComponent

public void fillBitmapsFromUnsortedEncodedKeyComponent(Float key,
                                                       int rowNum,
                                                       MutableBitmap[] bitmapIndexes,
                                                       BitmapFactory factory)

Description copied from interface: DimensionIndexer

Helper function for building bitmap indexes for integer-encoded dimensions. Called by IncrementalIndexAdapter as it iterates through its sequence of rows. Given a row value array from a Row key, with the current row number indicated by "rowNum", set the index for "rowNum" in the bitmap index for each value that appears in the row value array. For example, if key is an int[] array with values [1,3,4] for a dictionary-encoded String dimension, and rowNum is 27, this function would set bit 27 in bitmapIndexes[1], bitmapIndexes[3], and bitmapIndexes[4] See StringDimensionIndexer.fillBitmapsFromUnsortedEncodedKeyComponent() for a reference implementation. If a dimension type does not support bitmap indexes, this function will not be called and can be left unimplemented.

Specified by:

fillBitmapsFromUnsortedEncodedKeyComponent in interface DimensionIndexer<Float,Float,Float>

Parameters:

key - dimension value array from a Row key

rowNum - current row number

bitmapIndexes - array of bitmaps, indexed by integer dimension value

factory - bitmap factory