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metric_boundary.as("m").join(alert.as("a"), $"a.boundary_id" === $"m.boundary_id") Scala is sometimes dangerously syntax-sweet, but Spark does some things righ

metric_boundary.as("m").join(alert.as("a"), $"a.boundary_id" === $"m.boundary_id") Scala is sometimes dangerously syntax-sweet, but Spark does some things right.