How to use

supplierFromObjectSelector

method

in

org.apache.druid.segment.virtual.ExpressionSelectors

} else if (nativeType == null) {
 supplier = supplierFromObjectSelector(columnSelectorFactory.makeColumnValueSelector(columnName));
} else {

@Test
public void testSupplierFromObjectSelectorList()
{
 final SettableSupplier<List> settableSupplier = new SettableSupplier<>();
 final Supplier<Object> supplier = ExpressionSelectors.supplierFromObjectSelector(
   objectSelectorFromSupplier(settableSupplier, List.class)
 );
 // List can't be a number, so supplierFromObjectSelector should return null.
 Assert.assertNull(supplier);
}

@Test
public void testSupplierFromObjectSelectorString()
{
 final SettableSupplier<String> settableSupplier = new SettableSupplier<>();
 final Supplier<Object> supplier = ExpressionSelectors.supplierFromObjectSelector(
   objectSelectorFromSupplier(settableSupplier, String.class)
 );
 Assert.assertNotNull(supplier);
 Assert.assertEquals(null, supplier.get());
 settableSupplier.set("1.1");
 Assert.assertEquals("1.1", supplier.get());
 settableSupplier.set("1");
 Assert.assertEquals("1", supplier.get());
}

@Test
public void testSupplierFromObjectSelectorNumber()
{
 final SettableSupplier<Number> settableSupplier = new SettableSupplier<>();
 final Supplier<Object> supplier = ExpressionSelectors.supplierFromObjectSelector(
   objectSelectorFromSupplier(settableSupplier, Number.class)
 );
 Assert.assertNotNull(supplier);
 Assert.assertEquals(null, supplier.get());
 settableSupplier.set(1.1f);
 Assert.assertEquals(1.1f, supplier.get());
 settableSupplier.set(1L);
 Assert.assertEquals(1L, supplier.get());
}

@Test
public void testSupplierFromObjectSelectorObject()
{
 final SettableSupplier<Object> settableSupplier = new SettableSupplier<>();
 final Supplier<Object> supplier = ExpressionSelectors.supplierFromObjectSelector(
   objectSelectorFromSupplier(settableSupplier, Object.class)
 );
 Assert.assertNotNull(supplier);
 Assert.assertEquals(null, supplier.get());
 settableSupplier.set(1.1f);
 Assert.assertEquals(1.1f, supplier.get());
 settableSupplier.set(1L);
 Assert.assertEquals(1L, supplier.get());
 settableSupplier.set("1234");
 Assert.assertEquals("1234", supplier.get());
 settableSupplier.set("1.234");
 Assert.assertEquals("1.234", supplier.get());
}

} else if (nativeType == null) {
 supplier = supplierFromObjectSelector(columnSelectorFactory.makeColumnValueSelector(columnName));
} else {