IvanVergiliev commented on issue #24068: [SPARK-27105][SQL] Optimize away exponential complexity in ORC predicate conversion URL: https://github.com/apache/spark/pull/24068#issuecomment-474501284 `ExpressionTree` is a public class, but it doesn’t expose any public constructors so we can’t instantiate it without reflection or the like. The way I understand this is: - some parts of the hive codebase work with the ExpressionTree directly so the class is public; - however, the builder performs a bunch of optimizations on the tree, which appears to be the reason one can’t just directly create an `ExpressionTree` (so that the SearchArgument always has the builder transformations).
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