https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/Aggregate.scala#L85
I can't understand this code, it seems to be a "bug", but group by of
SparkSQL just works fine.
with code below, some expressions are mapping to AttributeReferences, then
"bindReference" method will find there references. But resultAttribute's
exprId is new, I don't think it can find the true reference(But it does,
Why? How?)
private[this] val resultExpressions = aggregateExpressions.map { agg =>
agg.transform {
case e: Expression if resultMap.contains(e) => resultMap(e)
}
}
I'm trying to write a DSL with Catalyst
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