bryanck commented on code in PR #18148:
URL: https://github.com/apache/iceberg/pull/18148#discussion_r4166412057
##########
spark/v4.2/spark/src/main/java/org/apache/iceberg/spark/source/SparkChangelogScanBuilder.java:
##########
@@ -35,11 +43,45 @@
public class SparkChangelogScanBuilder extends BaseSparkScanBuilder
implements SupportsPushDownV2Filters, SupportsPushDownRequiredColumns,
SupportsPushDownLimit {
+ private static final Set<String> CHANGELOG_METADATA_COLUMNS =
+ ImmutableSet.of(
+ MetadataColumns.CHANGE_TYPE.name(),
+ MetadataColumns.CHANGE_ORDINAL.name(),
+ MetadataColumns.COMMIT_SNAPSHOT_ID.name());
+
SparkChangelogScanBuilder(
SparkSession spark, Table table, Schema schema, CaseInsensitiveStringMap
options) {
super(spark, table, schema, options);
}
+ @Override
+ public Predicate[] pushPredicates(Predicate[] predicates) {
+ List<Predicate> changelogPredicates = Lists.newArrayList();
+ List<Predicate> pushable = Lists.newArrayList();
+
+ for (Predicate predicate : predicates) {
+ if (isChangelogColumnPredicate(predicate)) {
+ changelogPredicates.add(predicate);
+ } else {
+ pushable.add(predicate);
+ }
+ }
+
+ Predicate[] remainingPredicates =
super.pushPredicates(pushable.toArray(new Predicate[0]));
+
+ return Stream.concat(Arrays.stream(remainingPredicates),
changelogPredicates.stream())
+ .toArray(Predicate[]::new);
+ }
+
+ // changelog metadata columns are generated by ChangelogRowReader, not part
of the table's
+ // real schema, so leave them for Spark to evaluate after the scan instead
of pushing them
+ // down to Iceberg.
+ private static boolean isChangelogColumnPredicate(Predicate predicate) {
+ return Arrays.stream(predicate.references())
+ .flatMap(ref -> Arrays.stream(ref.fieldNames()))
Review Comment:
I think we just want to check top level names and not nested types? If so,
perhaps get rid of the flat map and just check the first name element
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