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https://issues.apache.org/jira/browse/CALCITE-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14206142#comment-14206142
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Vladimir Sitnikov commented on CALCITE-460:
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Agreed.
So using {{ImmutableBitSet}} just for immutability and breaking the API works
for me.
> Add ImmutableBitSet and replace uses of BitSet
> ----------------------------------------------
>
> Key: CALCITE-460
> URL: https://issues.apache.org/jira/browse/CALCITE-460
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Calcite makes heavy use of bit sets. java.util.BitSet has a convenient API
> but (a) is mutable, (b) uses quite a lot of memory, (c) is not iterable.
> Propose to implement ImmutableBitSet, which addresses those deficiencies.
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