Package org.apache.druid.segment

Interface ColumnInspector

All Superinterfaces:

Expr.InputBindingInspector

All Known Subinterfaces:

ColumnIndexSelector, ColumnSelector, ColumnSelectorFactory, CursorFactory, IncrementalIndexRowSelector, PhysicalSegmentInspector, QueryableIndex, VectorColumnSelectorFactory

All Known Implementing Classes:

AllNullColumnSelectorFactory, ColumnarFrameCursorFactory, ColumnCache, DefaultColumnSelectorFactoryMaker.ColumnAccessorBasedColumnSelectorFactory, FilteredCursorFactory, FrameColumnSelectorFactory, FrameQueryableIndex, HashJoinSegmentCursorFactory, IncrementalIndex, IncrementalIndexCursorFactory, IncrementalIndexPhysicalSegmentInspector, IndexedTableColumnSelectorFactory, LookupColumnSelectorFactory, MultiColumnSelectorFactory, NoopQueryableIndex, OnHeapAggregateProjection, OnheapIncrementalIndex, QueryableIndexColumnSelectorFactory, QueryableIndexCursorFactory, QueryableIndexPhysicalSegmentInspector, QueryableIndexVectorColumnSelectorFactory, RemapColumnSelectorFactory, RemapVectorColumnSelectorFactory, RestrictedCursorFactory, RowBasedColumnSelectorFactory, RowBasedCursorFactory, RowFrameCursorFactory, RowSignature, SettableCursorColumnSelectorFactory, ShimColumnSelectorFactory, SimpleQueryableIndex, UnnestCursorFactory, VirtualizedColumnInspector, VirtualizedColumnSelectorFactory

public interface ColumnInspector
extends Expr.InputBindingInspector

Method Summary

Modifier and Type	Method	Description
ColumnCapabilities	getColumnCapabilities(String column)	Returns capabilities of a particular column.
default ExpressionType	getType(String name)	Get the ExpressionType from the backing store for a given identifier (this is likely a column, but could be other things depending on the backing adapter)

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

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

Method Details

getColumnCapabilities

@Nullable
ColumnCapabilities getColumnCapabilities(String column)

Returns capabilities of a particular column.

Parameters:

column - column name

Returns:

capabilities, or null

getType

@Nullable
default ExpressionType getType(String name)

Description copied from interface: Expr.InputBindingInspector

Get the ExpressionType from the backing store for a given identifier (this is likely a column, but could be other things depending on the backing adapter)

Specified by:

getType in interface Expr.InputBindingInspector