twuebi commented on PR #605:
URL: https://github.com/apache/iceberg-go/pull/605#issuecomment-3450633489
@dttung2905, it's supported in nested types:
`org.apache.iceberg.TestSchema#testUnknownSupport`
```java
@Test
public void testUnknownSupport() {
// this needs a different schema because it cannot be used in required
fields
Schema schemaWithUnknown =
new Schema(
Types.NestedField.required(1, "id", Types.LongType.get()),
Types.NestedField.optional(2, "top", Types.UnknownType.get()),
Types.NestedField.optional(
3, "arr", Types.ListType.ofOptional(4,
Types.UnknownType.get())),
Types.NestedField.required(
5,
"struct",
Types.StructType.of(
Types.NestedField.optional(6, "inner_op",
Types.UnknownType.get()),
Types.NestedField.optional(
7,
"inner_map",
Types.MapType.ofOptional(
8, 9, Types.StringType.get(),
Types.UnknownType.get())),
Types.NestedField.optional(
10,
"struct_arr",
Types.StructType.of(
Types.NestedField.optional(11, "deep",
Types.UnknownType.get()))))));
assertThatThrownBy(() -> Schema.checkCompatibility(schemaWithUnknown, 2))
.isInstanceOf(IllegalStateException.class)
.hasMessage(
"Invalid schema for v%s:\n"
+ "- Invalid type for top: %s is not supported until v%s\n"
+ "- Invalid type for arr.element: %s is not supported until
v%s\n"
+ "- Invalid type for struct.inner_op: %s is not supported
until v%s\n"
+ "- Invalid type for struct.inner_map.value: %s is not
supported until v%s\n"
+ "- Invalid type for struct.struct_arr.deep: %s is not
supported until v%s",
2,
Types.UnknownType.get(),
MIN_FORMAT_VERSIONS.get(Type.TypeID.UNKNOWN),
Types.UnknownType.get(),
MIN_FORMAT_VERSIONS.get(Type.TypeID.UNKNOWN),
Types.UnknownType.get(),
MIN_FORMAT_VERSIONS.get(Type.TypeID.UNKNOWN),
Types.UnknownType.get(),
MIN_FORMAT_VERSIONS.get(Type.TypeID.UNKNOWN),
Types.UnknownType.get(),
MIN_FORMAT_VERSIONS.get(Type.TypeID.UNKNOWN));
assertThatCode(() -> Schema.checkCompatibility(schemaWithUnknown, 3))
.doesNotThrowAnyException();
}
```
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