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[FEATURE] Calcite Engine Framework: pushdown aggregation with non-reference expression #3386

@qianheng-aws

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@qianheng-aws

Is your feature request related to a problem?
Calcite Engine Framework: pushdown aggregation with non-reference expression

What solution would you like?
Use script API to do push down. And we also need to match aggregate-project-scan pattern to do this optimization since Calcite aggregate only supports reference expression as its arguments.

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