[SPARK-51268][SQL] Make TreeNode lock-free
#50019
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cc @JoshRosen and @cloud-fan |
zhengruifeng
commented
Feb 21, 2025
| @@ -67,15 +67,16 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]] | |||
| def outputOrdering: Seq[SortOrder] = Nil | |||
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| // Override `treePatternBits` to propagate bits for its expressions. | |||
| override lazy val treePatternBits: BitSet = { | |||
| private val _treePatternBits = new BestEffortLazyVal[BitSet](() => { | |||
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treePatternBits was kept lazy val in previous PR, do you @cloud-fan remember it was intended or not?
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Curiously, Since the treePatternBits only init once, how it keep the correctness if the expressions transformed with rules?
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What changes were proposed in this pull request?
Make
TreeNodelock-free, by replacelazy valwithBestEffortLazyValWhy are the changes needed?
In several deadlock issues, we observed that the lock of
TreeNode._hashCodeis the root cause.Does this PR introduce any user-facing change?
no
How was this patch tested?
ci
Was this patch authored or co-authored using generative AI tooling?
no