SinghAsDev commented on a change in pull request #3774:
URL: https://github.com/apache/iceberg/pull/3774#discussion_r795249134
##########
File path:
parquet/src/main/java/org/apache/iceberg/parquet/ParquetTypeVisitor.java
##########
@@ -66,32 +66,52 @@
Preconditions.checkArgument(list.getFieldCount() == 1,
"Invalid list: does not contain single repeated field: %s", list);
- GroupType repeatedElement = list.getFields().get(0).asGroupType();
+ Type repeatedElement = list.getFields().get(0);
Preconditions.checkArgument(repeatedElement.isRepetition(Type.Repetition.REPEATED),
"Invalid list: inner group is not repeated");
- Preconditions.checkArgument(repeatedElement.getFieldCount() <= 1,
- "Invalid list: repeated group is not a single field: %s", list);
+
+ Type listElement = ParquetSchemaUtil.determineListElementType(list);
+ if (listElement.isRepetition(Type.Repetition.REPEATED)) {
+ return visitTwoLevelList(list, listElement, visitor);
+ } else {
+ return visitThreeLevelList(list, listElement, visitor);
+ }
+ }
+
+ private static <T> T visitTwoLevelList(GroupType list, Type listElement,
ParquetTypeVisitor<T> visitor) {
+ T elementResult = visitListElement(list, listElement, visitor);
+ return visitor.list(list, elementResult);
+ }
+
+ private static <T> T visitThreeLevelList(GroupType list, Type listElement,
ParquetTypeVisitor<T> visitor) {
+ Type repeatedElement = list.getFields().get(0);
visitor.beforeRepeatedElement(repeatedElement);
try {
- T elementResult = null;
- if (repeatedElement.getFieldCount() > 0) {
- Type elementField = repeatedElement.getType(0);
- visitor.beforeElementField(elementField);
- try {
- elementResult = visit(elementField, visitor);
- } finally {
- visitor.afterElementField(elementField);
- }
- }
+ T elementResult = visitListElement(list, listElement, visitor);
return visitor.list(list, elementResult);
-
} finally {
visitor.afterRepeatedElement(repeatedElement);
}
}
+ private static <T> T visitListElement(GroupType list, Type listElement,
ParquetTypeVisitor<T> visitor) {
+ Type repeatedElement = list.getFields().get(0);
+ T elementResult = null;
+
+ if (repeatedElement.isPrimitive() ||
repeatedElement.asGroupType().getFieldCount() > 0) {
Review comment:
Good point, updated
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