ebyhr commented on code in PR #11755:
URL: https://github.com/apache/iceberg/pull/11755#discussion_r1881237568
##########
core/src/test/java/org/apache/iceberg/TestSchemaUpdate.java:
##########
@@ -731,6 +731,17 @@ public void testAmbiguousAdd() {
.hasMessageStartingWith("Cannot add column with ambiguous name:
preferences.booleans");
}
+ @Test
+ public void testAddStructTypeWithEmptyFields() {
+ assertThatThrownBy(
+ () -> {
+ UpdateSchema update = new SchemaUpdate(SCHEMA,
SCHEMA_LAST_COLUMN_ID);
+ update.addColumn("empty_struct", Types.StructType.of());
+ })
+ .isInstanceOf(IllegalArgumentException.class)
+ .hasMessageStartingWith("Cannot add struct with empty fields:
struct<>");
+ }
Review Comment:
Do we have a test that drops the last field from a column?
##########
core/src/main/java/org/apache/iceberg/SchemaUpdate.java:
##########
@@ -168,6 +168,17 @@ private void internalAddColumn(
fullName = name;
}
+ // when adding structs with empty fields, Parquet fails complaining
+ // Cannot write a schema with an empty group, so fail on add column
+ // More details: https://issues.apache.org/jira/browse/SPARK-20593
Review Comment:
What's the expected behavior when the nested field (not root type) is an
empty? e.g.
```java
Types.StructType.of(Types.NestedField.optional(1, "x",
Types.StructType.of()))
```
Can we add such a test?
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