case class ExpressionStats(expr: Expression)(useCount: Int = 1) extends Product with Serializable
A wrapper in place of using Seq[Expression] to record a group of equivalent expressions.
This saves a lot of memory when there are a lot of expressions in a same equivalence group. Instead of appending to a mutable list/buffer of Expressions, just update the "flattened" useCount in this wrapper in-place.
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- new ExpressionStats(expr: Expression)(useCount: Int = 1)
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