Katerina Bletsch

Support simple query pushdown

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# Description This is analysis PR for #2, we won't merge it. Select queries of the form `{_id: }`. PR scope is `{_id: }` where `` is `ObjectID`. ## Tigris...

Support simple query pushdown for Postgres

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## Support simple query pushdown The goal of this task is to enable simple query pushdown for querier that look like `{_id: }`. Only that field name (`_id`) is supported,...

The goal of this task is to enable a simple query pushdown for querier that looks like `{_id: }`. Only that field name (`_id`) is supported, and only that value...

A test case: ```go "SetMalformedDoc": { id: "string", update: bson.D{{"$set", bson.D{{"$k", "key"}}}}, err: &mongo.WriteError{ Code: 52, Message: "The dollar ($) prefixed field '$k' in '$k' is not allowed in the...

Add update expression checks

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- [ ] Update document must contain key beginning with '$ - [ ] An empty update path is not valid Details # Update document must contain key beginning with...

Refs #644 ### Test case ```go "SetSet": { filter: bson.D{{"_id", "test"}}, update: bson.D{ {"$set", bson.D{{"foo", int32(12)}}}, {"$set", bson.D{{"value", math.NaN()}}}, }, res: bson.D{{"_id", "test"}, {"foo", int32(12)}, {"value", math.NaN()}}, }, ``` When...

**Is your feature request related to a problem? Please describe.** It's a feature request to let know the collection size **Describe the solution you'd like** * Approximate or precise size...