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Posted to commits@pinot.apache.org by "Jackie-Jiang (via GitHub)" <gi...@apache.org> on 2026/04/14 02:22:08 UTC
[PR] Push element length and ASCII stats into Dictionary implementations [pinot]
Jackie-Jiang opened a new pull request, #18189:
URL: https://github.com/apache/pinot/pull/18189
## Summary
- Move incremental computation of `getLengthOfShortestElement`, `getLengthOfLongestElement`, `isAscii`, and `getSortedValues` out of `MutableColumnStatistics` and into the `Dictionary` hierarchy, eliminating the segment-scan TODO
- Add `BaseConstantValueDictionary` as abstract base for all constant-value dictionaries, providing default implementations for stats methods
- Track element length and ASCII stats incrementally during `index()` in all `MutableDictionary` implementations (Int/Long/Float/Double/BigDecimal/String/Bytes × OnHeap/OffHeap)
- Simplify `MutableColumnStatistics` to delegate stats to `Dictionary` instead of computing them via segment scan
- Remove `getSortedValues()` from `Dictionary` SPI (no longer needed)
- Rewrite `MutableColumnStatisticsTest` to use real dictionary implementations instead of mocks, covering onHeap mutable, offHeap mutable, and constant-value dictionaries
## Test plan
- [ ] Existing unit tests pass (`MutableColumnStatisticsTest` rewritten with real dictionaries)
- [ ] Verify `MutableDictionaryTest` still passes
- [ ] Run `pinot-segment-local` and `pinot-segment-spi` module tests
- [ ] Verify no downstream compile breaks in `startree-pinot` modules
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.6 <no...@anthropic.com>
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Re: [PR] Push element length and ASCII stats into Dictionary implementations [pinot]
Posted by "Jackie-Jiang (via GitHub)" <gi...@apache.org>.
Jackie-Jiang commented on code in PR #18189:
URL: https://github.com/apache/pinot/pull/18189#discussion_r3082865455
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/DocIdDictionary.java:
##########
@@ -47,12 +52,7 @@ public int insertionIndexOf(String stringValue) {
@Override
public int indexOf(int value) {
- return insertionIndexOf(Integer.toString(value));
- }
-
- @Override
- public DataType getValueType() {
- return DataType.INT;
+ return (value >= 0 && value < _numDocs) ? value : NULL_VALUE_INDEX;
Review Comment:
This is actually a bugfix
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Re: [PR] Push element length and ASCII stats into Dictionary implementations [pinot]
Posted by "Copilot (via GitHub)" <gi...@apache.org>.
Copilot commented on code in PR #18189:
URL: https://github.com/apache/pinot/pull/18189#discussion_r3076815312
##########
pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/reader/Dictionary.java:
##########
@@ -138,13 +138,39 @@ default int indexOf(ByteArray bytesValue) {
*/
Comparable getMaxVal();
- /**
- * Returns a sorted array of all values in the dictionary. For type INT/LONG/FLOAT/DOUBLE, primitive type array will
- * be returned; for type BIG_DECIMAL, {@code BigDecimal[]} will be returned; for type STRING, {@code String[]} will be
- * returned; for type BYTES, {@code ByteArray[]} will be returned.
- * This method is for the stats collection phase when sealing the consuming segment.
- */
- Object getSortedValues();
+ /// Returns a sorted array of all values in the dictionary. For type INT/LONG/FLOAT/DOUBLE, primitive type array
+ /// will be returned; for type BIG_DECIMAL, `BigDecimal[]` will be returned; for type STRING, `String[]` will be
+ /// returned; for type BYTES, `ByteArray[]` will be returned.
+ ///
+ /// This method is for the stats-collection phase when sealing the consuming segment. It should be overridden when
+ /// the dictionary is used in a mutable segment.
+ default Object getSortedValues() {
+ throw new UnsupportedOperationException();
+ }
Review Comment:
PR description says `getSortedValues()` is removed from the `Dictionary` SPI, but the method is still present (now as a default method) and is still used by `MutableColumnStatistics#getUniqueValuesSet()`. Please either update the PR description to match the implementation, or follow through on the removal and adjust callers/tests accordingly.
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Re: [PR] Push element length and ASCII stats into Dictionary implementations [pinot]
Posted by "Jackie-Jiang (via GitHub)" <gi...@apache.org>.
Jackie-Jiang merged PR #18189:
URL: https://github.com/apache/pinot/pull/18189
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Re: [PR] Push element length and ASCII stats into Dictionary implementations [pinot]
Posted by "codecov-commenter (via GitHub)" <gi...@apache.org>.
codecov-commenter commented on PR #18189:
URL: https://github.com/apache/pinot/pull/18189#issuecomment-4241088613
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>
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>|------|------|------|
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<details><summary>Additional details and impacted files</summary>
```diff
@@ Coverage Diff @@
## master #18189 +/- ##
============================================
- Coverage 63.31% 55.21% -8.10%
+ Complexity 1627 837 -790
============================================
Files 3229 2535 -694
Lines 196705 145729 -50976
Branches 30408 23433 -6975
============================================
- Hits 124544 80465 -44079
+ Misses 62183 58324 -3859
+ Partials 9978 6940 -3038
```
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</details>
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Re: [PR] Push element length and ASCII stats into Dictionary implementations [pinot]
Posted by "xiangfu0 (via GitHub)" <gi...@apache.org>.
xiangfu0 commented on code in PR #18189:
URL: https://github.com/apache/pinot/pull/18189#discussion_r3078226210
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/DocIdDictionary.java:
##########
@@ -47,12 +52,7 @@ public int insertionIndexOf(String stringValue) {
@Override
public int indexOf(int value) {
- return insertionIndexOf(Integer.toString(value));
- }
-
- @Override
- public DataType getValueType() {
- return DataType.INT;
+ return (value >= 0 && value < _numDocs) ? value : NULL_VALUE_INDEX;
Review Comment:
This is behavior change, worth to confirm the usage of `indexOf` and `insertionIndexOf` are not mixed.
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