tuichenchuxin commented on code in PR #4228:
URL: https://github.com/apache/calcite/pull/4228#discussion_r1988310846
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mongodb/src/test/java/org/apache/calcite/adapter/mongodb/MongoAdapterTest.java:
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@@ -605,12 +607,7 @@ private CalciteAssert.AssertThat assertModel(URL url) {
+ " ]\n"
+ " }\n"
+ "}",
- "{$project: {CITY: '$city', STATE: '$state'}}",
- "{$group: {_id: {CITY: '$CITY', STATE: '$STATE'}}}",
- "{$project: {_id: 0, CITY: '$_id.CITY', STATE: '$_id.STATE'}}",
- "{$group: {_id: '$STATE', CDC: {$sum: {$cond: [ {$eq: ['CITY',
null]}, 0, 1]}}}}",
- "{$project: {STATE: '$_id', CDC: '$CDC'}}",
- "{$sort: {STATE: 1}}"));
+ "{$project: {STATE: '$state', CITY: '$city'}}"));
Review Comment:
I found the implementation of group and count distinct is not implemented by
mongo statements, but through code and API
https://github.com/apache/calcite/blob/618e601b136e92db933523f77dd7af3c1dfe2779/mongodb/src/main/java/org/apache/calcite/adapter/mongodb/MongoToEnumerableConverter.java#L113-L116
https://github.com/apache/calcite/blob/618e601b136e92db933523f77dd7af3c1dfe2779/mongodb/src/main/java/org/apache/calcite/adapter/mongodb/MongoTable.java#L131-L153
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