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https://issues.apache.org/jira/browse/CALCITE-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14206854#comment-14206854
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Vladimir Sitnikov commented on CALCITE-460:
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That's a big change.
{code:sql}
+ if (builder.wouldEqual(bitSet)) {
+ return bitSet;
+ }
+ return builder.build();
{code}
What if {{Builder(ImmutableBitSet)}} remembers the input bitset and returns
that in the build method if the result is the same?
> 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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