feat: add fragment range read to Java API#6490
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bryanck wants to merge 3 commits intolance-format:mainfrom
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feat: add fragment range read to Java API#6490bryanck wants to merge 3 commits intolance-format:mainfrom
bryanck wants to merge 3 commits intolance-format:mainfrom
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added 2 commits
April 12, 2026 18:45
bryanck
commented
Apr 13, 2026
| public class FragmentMetadata implements Serializable { | ||
| private static final long serialVersionUID = -5886811251944130460L; | ||
| private final int id; | ||
| private final int id; // FIXME: change to long |
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Fragment ID should be a long but that is a fairly significant change so left that for a follow up.
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I opened this follow up to move fragment ID to long... #6498
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This PR exposes a fragment range read method in the Java API. It adds a new
readRangemethod to the JavaFragmentclass that calls a new JNI native method. Currently the only way to read a range from a fragment is to use the dataset scanner, however the dataset scanner always callscount_all_rowson the dataset when bounds checking a range. That adds overhead to the operation.An alternative approach would be to add an option to disable the bounds check when using dataset scanner, but I felt this solution reflects the native API more closely.
Here's a CPU profile using dataset scanner (first) and fragment range read (second)...
