Package org.apache.druid.segment

Interface PhysicalSegmentInspector

All Superinterfaces:

ColumnInspector, Expr.InputBindingInspector

All Known Implementing Classes:

IncrementalIndexPhysicalSegmentInspector, QueryableIndexPhysicalSegmentInspector

public interface PhysicalSegmentInspector
extends ColumnInspector

Interface for methods describing physical segments such as QueryableIndexSegment and IncrementalIndexSegment that is not typically used at query time (outside of metadata queries).

Method Summary

Modifier and Type	Method	Description
int	getDimensionCardinality(String column)	Returns the number of distinct values in a column, if known, or DimensionDictionarySelector.CARDINALITY_UNKNOWN if not.}
Comparable	getMaxValue(String column)	Returns the minimum value of the provided column, if known through an index, dictionary, or cache.
Metadata	getMetadata()	Returns Metadata which contains details about how the segment was created
Comparable	getMinValue(String column)	Returns the minimum value of the provided column, if known through an index, dictionary, or cache.
int	getNumRows()	Returns the number of rows in the segment

Methods inherited from interface org.apache.druid.segment.ColumnInspector

getColumnCapabilities, getType

Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector

areNumeric, areNumeric, areSameTypes, areSameTypes, areScalar, areScalar, canVectorize, canVectorize

Method Details

getMetadata

@Nullable
Metadata getMetadata()

Returns Metadata which contains details about how the segment was created

getMinValue

@Nullable
Comparable getMinValue(String column)

Returns the minimum value of the provided column, if known through an index, dictionary, or cache. Returns null if not known. Does not scan the column to find the minimum value.

getMaxValue

@Nullable
Comparable getMaxValue(String column)

Returns the minimum value of the provided column, if known through an index, dictionary, or cache. Returns null if not known. Does not scan the column to find the maximum value.

getDimensionCardinality

int getDimensionCardinality(String column)

Returns the number of distinct values in a column, if known, or DimensionDictionarySelector.CARDINALITY_UNKNOWN if not.}

getNumRows

int getNumRows()

Returns the number of rows in the segment