rdblue commented on a change in pull request #4060:
URL: https://github.com/apache/iceberg/pull/4060#discussion_r804861208
##########
File path:
flink/v1.14/flink/src/main/java/org/apache/iceberg/flink/source/DataIterator.java
##########
@@ -41,16 +42,59 @@
private final FileScanTaskReader<T> fileScanTaskReader;
private final InputFilesDecryptor inputFilesDecryptor;
+ private final CombinedScanTask combinedTask;
+
private Iterator<FileScanTask> tasks;
private CloseableIterator<T> currentIterator;
+ private int fileOffset;
+ private long recordOffset;
public DataIterator(FileScanTaskReader<T> fileScanTaskReader,
CombinedScanTask task,
FileIO io, EncryptionManager encryption) {
this.fileScanTaskReader = fileScanTaskReader;
this.inputFilesDecryptor = new InputFilesDecryptor(task, io, encryption);
+ this.combinedTask = task;
+
this.tasks = task.files().iterator();
this.currentIterator = CloseableIterator.empty();
+
+ // fileOffset starts at -1 because we started
+ // from an empty iterator that is not from the split files.
+ this.fileOffset = -1;
+ // record offset points to the record that next() should return when called
+ this.recordOffset = 0L;
+ }
+
+ /**
+ * (startingFileOffset, startingRecordOffset) points to the next row that
reader should resume from.
+ * E.g., if the seek position is (file=0, record=1), seek moves the iterator
position to the 2nd row
+ * in file 0. When next() is called after seek, 2nd row from file 0 should
be returned.
+ */
+ public void seek(int startingFileOffset, long startingRecordOffset) {
+ Preconditions.checkState(fileOffset == -1,
+ "Seek should be called before any other iterator actions");
+ // skip files
+ Preconditions.checkState(startingFileOffset < combinedTask.files().size(),
+ "Invalid startingFileOffset %d for CombinedScanTask with %d files: %s",
+ startingFileOffset, combinedTask.files().size(), combinedTask);
+ for (long i = 0L; i < startingFileOffset; ++i) {
+ tasks.next();
+ }
+
+ updateCurrentIterator();
+ // skip records within the file
+ for (long i = 0; i < startingRecordOffset; ++i) {
+ if (currentFileHasNext() && hasNext()) {
+ next();
+ } else {
+ throw new IllegalStateException(String.format("Invalid
startingRecordOffset %d for file %d " +
+ "from CombinedScanTask: %s", startingRecordOffset,
startingFileOffset, combinedTask));
Review comment:
We usually like to use plain language rather than variable or class
names.
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