stevenzwu commented on code in PR #8803:
URL: https://github.com/apache/iceberg/pull/8803#discussion_r1373440573
##########
core/src/main/java/org/apache/iceberg/BaseFile.java:
##########
@@ -504,6 +508,27 @@ private static Map<Integer, ByteBuffer>
toReadableByteBufferMap(Map<Integer, Byt
}
}
+ private static <TypeT> Map<Integer, TypeT> filterColumnsStats(
+ Map<Integer, TypeT> map, Set<Integer> columnIds) {
+ if (columnIds == null || columnIds.isEmpty()) {
+ return SerializableMap.copyOf(map);
+ }
+
+ if (map == null) {
+ return null;
+ }
+
+ Map<Integer, TypeT> filtered =
Maps.newHashMapWithExpectedSize(columnIds.size());
+ for (Integer columnId : columnIds) {
+ TypeT value = map.get(columnId);
+ if (value != null) {
Review Comment:
thanks for the unit test code. I am still not comfortable of making the
assumption as the Iceberg spec clearly said null stats value is possible. what
if Trino parquet writer produces min/max stats with null value.
```
Lower bound for the non-null, non-NaN values in the partition field, or null
if all values are null or NaN [2]
```
As least, there is a mismatch in the Parquet writer implementation and the
spec. Unless we are going to clarify/update the spec, I feel it is safer to do
`map.containsKey(key)`.
Maybe @RussellSpitzer and @rdblue can chime in here.
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