```python
from typing import Optional


def say_hi(name: Optional[str]):
    print(f"Hey {name}!")
```

O parâmetro `name` é definido como `Optional[str]`, mas não é opcional; não é possível chamar a função sem o parâmetro:

```Python
say_hi()  # Ah, não, isso gera um erro! 😱
```

O parâmetro `name` continua obrigatório (não é opcional) porque não tem valor padrão. Ainda assim, `name` aceita `None` como valor:

```Python

  <!-- use the following if you're not using a snapshot version. -->
  <repository>
    <id>repo</id>
    <name>Repository Name</name>
    <url>scp://host/path/to/repo</url>
  </repository>
  <!-- use the following if you ARE using a snapshot version. -->
  <snapshotRepository>
    <id>repo</id>
    <name>Repository Name</name>
    <url>scp://host/path/to/repo</url>
  </snapshotRepository>
</distributionManagement>

    }

    public void setName_Equal(String name) {
        setName_Term(name, null);
    }

    public void setName_Equal(String name, ConditionOptionCall<TermQueryBuilder> opLambda) {
        setName_Term(name, opLambda);
    }

    public void setName_Term(String name) {
        setName_Term(name, null);
    }

    public void setName_Term(String name, ConditionOptionCall<TermQueryBuilder> opLambda) {

	if DB.Dialector.Name() != "sqlite" && DB.Dialector.Name() != "postgres" && DB.Dialector.Name() != "gaussdb" && DB.Dialector.Name() != "sqlserver" {
		return
	}

	companies := []Company{
		{Name: "delete-returning-1"},
		{Name: "delete-returning-2"},
		{Name: "delete-returning-3"},
	}
	DB.Create(&companies)

	var results []Company

    static Lifecycle.Phase phase(String name) {
        return new DefaultPhase(name, Collections.emptyList(), Collections.emptyList(), Collections.emptyList());
    }

    static Lifecycle.Phase phase(String name, Lifecycle.Phase... phases) {
        return new DefaultPhase(name, Collections.emptyList(), Collections.emptyList(), asList(phases));
    }

    static Lifecycle.Phase phase(String name, Lifecycle.Link link, Lifecycle.Phase... phases) {

    @Nonnull
    String id();

    /**
     * Returns the name of the tool option for this path. For example, if this path type
     * is {@link JavaPathType#MODULES}, then this method returns {@code "--module-path"}.
     * The option does not include the {@linkplain JavaPathType.Modular#moduleName() module name}
     * on which it applies.
     *
     * @return the name of the tool option for this path type
     */
    @Nonnull

			}
		}
		dst.KVS = append(dst.KVS, jstream.KV{
			Key:   elem.Name,
			Value: v,
		})
	}
	return dst, nil
}

// Set - sets the value for a column name.
func (r *Record) Set(name string, value *sql.Value) (sql.Record, error) {
	dst, err := r.CloneTo(nil)
	if err != nil {
		return nil, err
	}
	return dst.Set(name, value)
}

// WriteCSV - encodes to CSV data.

	} else if arr, ok := value.ToArray(); ok {
		v = arr
	} else {
		return nil, fmt.Errorf("unsupported sql value %v and type %v", value, value.GetTypeString())
	}

	name = strings.ReplaceAll(name, "*", "__ALL__")
	r.KVS = append(r.KVS, jstream.KV{Key: name, Value: v})
	return r, nil
}

// WriteCSV - encodes to CSV data.
func (r *Record) WriteCSV(writer io.Writer, opts sql.WriteCSVOpts) error {
	var csvRecord []string

    }

    public void setName_Count(ConditionOptionCall<ValueCountAggregationBuilder> opLambda) {
        setName_Count("name", opLambda);
    }

    public void setName_Count(String name, ConditionOptionCall<ValueCountAggregationBuilder> opLambda) {
        ValueCountAggregationBuilder builder = regCountA(name, "name");
        if (opLambda != null) {
            opLambda.callback(builder);
        }
    }

     */
    public static class Descriptor {
        private final String name;
        private final String className;
        private final String parent;

        private Descriptor(String name, String className, String parent) {
            this.name = name;
            this.className = className;
            this.parent = parent;
        }