Hi, ignite guys

I thought that Apache Ignite does what apache drill does[1], but it makes
me surprised that Ignite uses a top-down calcite optimizer [2]. But I
believe some issues blocks top-down [3].

Except for apace drill, both hazelcast[4] and Flink[5] split optimization
into two independent phases - logical and physical.

Why did Ignite make such a technical decision?

Thanks
- Chang

[1]
https://cwiki.apache.org/confluence/display/IGNITE/IEP-37%3A+New+query+execution+engine
[2] https://issues.apache.org/jira/browse/IGNITE-13117
[3] https://issues.apache.org/jira/browse/CALCITE-4052
[4] https://github.com/hazelcast/hazelcast
[5] https://github.com/apache/flink

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