laurentgo opened a new pull request #1229: [CALCITE-3085] Remove RelShuttleImpl#stack protected field URL: https://github.com/apache/calcite/pull/1229 org.apache.calcite.rel.RelShuttleImpl class has a protected stack field used to capture parent node when visiting children, but content of the stack is never accessed by subclasses. If visiting a deep tree, the size of the stack can grow quite large and be non-negligible. Remove the field to reduce memory pressure and simplify code.
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