RussellSpitzer commented on code in PR #11615:
URL: https://github.com/apache/iceberg/pull/11615#discussion_r1852396291
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spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
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@@ -248,6 +296,88 @@ protected Statistics estimateStatistics(Snapshot snapshot)
{
return new Stats(sizeInBytes, rowsCount, colStatsMap);
}
+ private Map<Integer, Long> calculateNullCount(
+ Map<String, Map<Integer, Long>> distinctDataFilesNullCount) {
+ Map<Integer, Long> nullCount;
+ // get the null counts from the manifest file
+ nullCount =
+ distinctDataFilesNullCount.values().stream() // Stream<Map<Integer,
Long>>
+ .flatMap(
+ innerMap ->
+ innerMap.entrySet().stream()) // Flatten to
Stream<Map.Entry<Integer, Long>>
+ .collect(
+ Collectors.toMap(
+ Map.Entry::getKey, // Key is the column id
+ Map.Entry::getValue,
+ Long::sum,
+ HashMap::new));
+ return nullCount;
+ }
+
+ private Object toSparkType(Type type, Object value) {
+ switch (type.typeId()) {
+ case DECIMAL:
+ return Decimal.apply((BigDecimal) value);
+ default:
+ }
+ return value;
+ }
+
+ // min/max are calculated for numeric, Date, and Timestamp only
+ private boolean isValidMinMaxType(Type type) {
+ switch (type.typeId()) {
+ case DATE:
+ case TIMESTAMP:
+ case INTEGER:
+ case LONG:
+ case FLOAT:
+ case DOUBLE:
+ case DECIMAL:
+ case BOOLEAN:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ // extract min/max values from the manifests
+ private Map<Integer, Object> calculateMinMax(
Review Comment:
This may have errors if any delete files are present or if there are any non
file covering predicates in the query
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