emkornfield commented on a change in pull request #7276:
URL: https://github.com/apache/arrow/pull/7276#discussion_r567487571
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File path:
java/vector/src/main/java/org/apache/arrow/vector/util/MapWithOrdinalImpl.java
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@@ -105,12 +105,18 @@ public boolean put(K key, V value, boolean override) {
public V remove(Object key) {
final Entry<Integer, V> oldPair = primary.remove(key);
if (oldPair != null) {
- final int lastOrdinal = secondary.size();
+ final int lastOrdinal = secondary.size() - 1;
final V last = secondary.get(lastOrdinal);
// normalize mappings so that all numbers until primary.size() is
assigned
// swap the last element with the deleted one
secondary.put(oldPair.getKey(), last);
- primary.put((K) key, new
AbstractMap.SimpleImmutableEntry<>(oldPair.getKey(), last));
+ secondary.remove(lastOrdinal);
+ primary.entrySet()
Review comment:
This seems like it might be a performance regression, would it be better
to keep a datastructure that tracks unused ordinals?
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