trait NoThrow extends AnyRef
Trait to indicate the expression does not throw an exception by itself when they are evaluated. For example, UDFs, AssertTrue, etc can throw an exception when they are executed. In such case, it is necessary to call Expression.eval, and the optimization rule should not ignore it.
This trait can be used in an optimization rule such as
org.apache.spark.sql.catalyst.optimizer.ConstantFolding to fold the expressions that
do not need to execute, for example, size(array(c0, c1, c2)).
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