public class MapVirtualColumn extends Object implements VirtualColumn
Constructor and Description |
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MapVirtualColumn(String keyDimension,
String valueDimension,
String outputName) |
Modifier and Type | Method and Description |
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ColumnCapabilities |
capabilities(String columnName)
Returns the capabilities of this virtual column, which includes a type that corresponds to the best
performing base selector supertype (e.
|
boolean |
equals(Object o) |
byte[] |
getCacheKey()
Get a byte array used as a cache key.
|
String |
getKeyDimension() |
String |
getOutputName()
Output name of this column.
|
String |
getValueDimension() |
int |
hashCode() |
ColumnValueSelector<?> |
makeColumnValueSelector(String columnName,
ColumnSelectorFactory factory)
Build a selector corresponding to this virtual column.
|
DimensionSelector |
makeDimensionSelector(DimensionSpec dimensionSpec,
ColumnSelectorFactory factory)
Build a selector corresponding to this virtual column.
|
List<String> |
requiredColumns()
Returns a list of columns that this virtual column will access.
|
String |
toString() |
boolean |
usesDotNotation()
Indicates that this virtual column can be referenced with dot notation.
|
public DimensionSelector makeDimensionSelector(DimensionSpec dimensionSpec, ColumnSelectorFactory factory)
VirtualColumn
DimensionSpec.getDimension()
, which
is useful if this column uses dot notation. The virtual column is expected to apply any
necessary decoration from the dimensionSpec.makeDimensionSelector
in interface VirtualColumn
dimensionSpec
- the dimensionSpec this column was referenced withfactory
- column selector factorypublic ColumnValueSelector<?> makeColumnValueSelector(String columnName, ColumnSelectorFactory factory)
VirtualColumn
makeColumnValueSelector
in interface VirtualColumn
columnName
- the name this virtual column was referenced withfactory
- column selector factorypublic ColumnCapabilities capabilities(String columnName)
VirtualColumn
BaseLongColumnValueSelector
) of the object, returned from
VirtualColumn.makeColumnValueSelector(String, ColumnSelectorFactory)
. May vary based on columnName if this column uses
dot notation.capabilities
in interface VirtualColumn
columnName
- the name this virtual column was referenced withpublic List<String> requiredColumns()
VirtualColumn
requiredColumns
in interface VirtualColumn
public boolean usesDotNotation()
VirtualColumn
usesDotNotation
in interface VirtualColumn
public byte[] getCacheKey()
Cacheable
getCacheKey
in interface Cacheable
public String getKeyDimension()
public String getValueDimension()
public String getOutputName()
VirtualColumn
getOutputName
in interface VirtualColumn
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