rdsr commented on a change in pull request #111: Split files when planning scan
tasks
URL: https://github.com/apache/incubator-iceberg/pull/111#discussion_r260430004
##########
File path: core/src/main/java/com/netflix/iceberg/BaseTableScan.java
##########
@@ -231,4 +234,69 @@ public String toString() {
.add("filter", rowFilter)
.toString();
}
+
+ private CloseableIterable<FileScanTask> planSplits(long splitSize) {
+ final CloseableIterable<FileScanTask> fileScanTasks = planFiles();
+ final Iterable<FileScanTask> splitTasks = FluentIterable
+ .from(fileScanTasks)
+ .transformAndConcat(input -> getSplits(input, splitSize));
+ // Capture manifests which can be closed after scan planning
+ final CloseableIterable<FileScanTask> closeableSplitTasks =
CloseableIterable
+ .combine(splitTasks, ImmutableList.of(fileScanTasks));
+ return closeableSplitTasks;
+ }
+
+ private static Iterable<FileScanTask> getSplits(FileScanTask fileScanTask,
long splitSize) {
+ return () -> new Iterator<FileScanTask>() {
+ long offset = 0;
+ long remainingLen = fileScanTask.length();
+
+ @Override
+ public boolean hasNext() {
+ return remainingLen > 0;
+ }
+
+ @Override
+ public FileScanTask next() {
+ long len = Math.min(splitSize, remainingLen);
+ final FileScanTask splitTask = splitTask(offset, len, fileScanTask);
+ offset += len;
+ remainingLen -= len;
+ return splitTask;
Review comment:
I've commented specific asserts under `TestFilteredScan` which rely on the
assumption that each task processes a single file. These changes are part of
the PR.
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