class SubExprEvaluationRuntime extends AnyRef
This class helps subexpression elimination for interpreted evaluation
such as InterpretedUnsafeProjection. It maintains an evaluation cache.
This class wraps ExpressionProxy around given expressions. The ExpressionProxy
intercepts expression evaluation and loads from the cache first.
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- new SubExprEvaluationRuntime(cacheMaxEntries: Int)
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def
proxyExpressions(expressions: Seq[Expression]): Seq[Expression]
Finds subexpressions and wraps them with
ExpressionProxy. -
def
setInput(input: InternalRow = null): Unit
Sets given input row as current row for evaluating expressions.
Sets given input row as current row for evaluating expressions. This cleans up the cache too as new input comes.
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