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Posted to dev@calcite.apache.org by "Haisheng Yuan (Jira)" <ji...@apache.org> on 2020/06/22 22:09:00 UTC
[jira] [Created] (CALCITE-4083) RelTraitSet failed to canonize
traits
Haisheng Yuan created CALCITE-4083:
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Summary: RelTraitSet failed to canonize traits
Key: CALCITE-4083
URL: https://issues.apache.org/jira/browse/CALCITE-4083
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Haisheng Yuan
RelTraitSet#plus uses FlatLists and ImmutableList. They have different hash algorithms, and they are all different classes from RelTraitSet. The RelTraitSet equality requires the other object must be RelTraitSet too, and the HashMap#get(key) uses key.equals() to check equality, instead of the other way. In case we pass RelTraitSet as the search key to cache, but the cached entry has key with FlatLists or ImmutableList, we may fail to find the cached RelTraitSet. Due to this, using == to check traitSet equality may fail, even they have same traits.
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