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David Overton 346804fc67 Support nested object fields in DC API and use this to implement nest… 
## Description

This change adds support for nested object fields in HGE IR and Schema Cache, the Data Connectors backend and API, and the MongoDB agent.

### Data Connector API changes

- The `/schema` endpoint response now includes an optional set of GraphQL type definitions. Table column types can refer to these definitions by name.
- Queries can now include a new field type `object` which contains a column name and a nested query. This allows querying into a nested object within a field.

### MongoDB agent changes

- Add support for querying into nested documents using the new `object` field type.

### HGE changes

- The `Backend` type class has a new type family `XNestedObjects b` which controls whether or not a backend supports querying into nested objects. This is currently enabled only for the `DataConnector` backend.
- For backends that support nested objects, the `FieldInfo` type gets a new constructor `FINestedObject`, and the `AnnFieldG` type gets a new constructor `AFNestedObject`.
- If the DC `/schema` endpoint returns any custom GraphQL type definitions they are stored in the `TableInfo` for each table in the source.
- During schema cache building, the function `addNonColumnFields` will check whether any column types match custom GraphQL object types stored in the `TableInfo`. If so, they are converted into `FINestedObject` instead of `FIColumn` in the `FieldInfoMap`.
- When building the `FieldParser`s from `FieldInfo` (function `fieldSelection`) any `FINestedObject` fields are converted into nested object parsers returning `AFNestedObject`.
- The `DataConnector` query planner converts `AFNestedObject` fields into `object` field types in the query sent to the agent.

## Limitations

### HGE not yet implemented:
- Support for nested arrays
- Support for nested objects/arrays in mutations
- Support for nested objects/arrays in order-by
- Support for filters (`where`) in nested objects/arrays
- Support for adding custom GraphQL types via track table metadata API
- Support for interface and union types
- Tests for nested objects

### Mongo agent not yet implemented:

- Generate nested object types from validation schema
- Support for aggregates
- Support for order-by
- Configure agent port
- Build agent in CI
- Agent tests for nested objects and MongoDB agent

PR-URL: https://github.com/hasura/graphql-engine-mono/pull/7844
GitOrigin-RevId: aec9ec1e4216293286a68f9b1af6f3f5317db423
2023-04-11 01:30:37 +00:00
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src Support nested object fields in DC API and use this to implement nest… 2023-04-11 01:30:37 +00:00
package.json Support nested object fields in DC API and use this to implement nest… 2023-04-11 01:30:37 +00:00
README.md Move Typescript types for Data Connector agent into their own package 2022-09-05 06:09:23 +00:00
tsconfig.json Move Typescript types for Data Connector agent into their own package 2022-09-05 06:09:23 +00:00

README.md

Hasura GraphQL Engine Data Connector Agent API Types

This package contains TypeScript types that Data Connector agents implemented in TypeScript could use to correctly implement the API required.

The Data Connector Reference agent can be used as an example of these types being used in practice to implement a Data Connector agent.