Class LookupColumnSelectorFactory
- java.lang.Object
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- org.apache.druid.segment.join.lookup.LookupColumnSelectorFactory
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- All Implemented Interfaces:
Expr.InputBindingInspector
,ColumnInspector
,ColumnSelectorFactory
public class LookupColumnSelectorFactory extends Object implements ColumnSelectorFactory
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Field Summary
Fields Modifier and Type Field Description static String
KEY_COLUMN
static String
VALUE_COLUMN
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ColumnCapabilities
getColumnCapabilities(String column)
Returns capabilities of a particular column, if known.ColumnValueSelector
makeColumnValueSelector(String columnName)
Returns ColumnValueSelector corresponding to the given column name, orNilColumnValueSelector
if the column with such name is absent.DimensionSelector
makeDimensionSelector(DimensionSpec dimensionSpec)
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.druid.segment.ColumnInspector
getColumnCapabilitiesWithDefault, getType
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Methods inherited from interface org.apache.druid.segment.ColumnSelectorFactory
getRowIdSupplier
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Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector
areNumeric, areNumeric, areSameTypes, areSameTypes, areScalar, areScalar, canVectorize, canVectorize
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Field Detail
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KEY_COLUMN
public static final String KEY_COLUMN
- See Also:
- Constant Field Values
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VALUE_COLUMN
public static final String VALUE_COLUMN
- See Also:
- Constant Field Values
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Method Detail
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makeDimensionSelector
@Nonnull public DimensionSelector makeDimensionSelector(DimensionSpec dimensionSpec)
- Specified by:
makeDimensionSelector
in interfaceColumnSelectorFactory
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makeColumnValueSelector
@Nonnull public ColumnValueSelector makeColumnValueSelector(String columnName)
Description copied from interface:ColumnSelectorFactory
Returns ColumnValueSelector corresponding to the given column name, orNilColumnValueSelector
if the column with such name is absent.- Specified by:
makeColumnValueSelector
in interfaceColumnSelectorFactory
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getColumnCapabilities
@Nullable public ColumnCapabilities getColumnCapabilities(String column)
Description copied from interface:ColumnSelectorFactory
Returns capabilities of a particular column, if known. May be null if the column doesn't exist, or if the column does exist but the capabilities are unknown. The latter is possible with dynamically discovered columns.- Specified by:
getColumnCapabilities
in interfaceColumnInspector
- Specified by:
getColumnCapabilities
in interfaceColumnSelectorFactory
- Parameters:
column
- column name- Returns:
- capabilities, or null
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