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Commit bdde010e authored by Josh Rosen's avatar Josh Rosen Committed by Wenchen Fan
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[SPARK-14863][SQL] Cache TreeNode's hashCode by default 

Caching TreeNode's `hashCode` can lead to orders-of-magnitude performance improvement in certain optimizer rules when operating on huge/complex schemas.

Author: Josh Rosen <joshrosen@databricks.com>

Closes #12626 from JoshRosen/cache-treenode-hashcode.
parent 39a77e15
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