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Document that adjusting the auto-discovered schema is required #18784

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mosabua merged 1 commit into from
Aug 28, 2023
Merged

Document that adjusting the auto-discovered schema is required #18784

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16 changes: 10 additions & 6 deletions docs/src/main/sphinx/connector/mongodb.md
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Expand Up @@ -210,9 +210,10 @@ This property is optional; the default is `0`.
MongoDB maintains table definitions on the special collection where `mongodb.schema-collection` configuration value specifies.

:::{note}
There's no way for the plugin to detect a collection is deleted.
You need to delete the entry by `db.getCollection("_schema").remove( { table: deleted_table_name })` in the Mongo Shell.
Or drop a collection by running `DROP TABLE table_name` using Trino.
The plugin cannot detect that a collection has been deleted. You must
delete the entry by executing `db.getCollection("_schema").remove( { table:
deleted_table_name })` in the MongoDB Shell. You can also drop a collection in
Trino by running `DROP TABLE table_name`.
:::

A schema collection consists of a MongoDB document for a table.
Expand All @@ -230,9 +231,12 @@ A schema collection consists of a MongoDB document for a table.
}
```

The connector quotes the fields for a row type when auto-generating the schema.
However, if the schema is being fixed manually in the collection then
the fields need to be explicitly quoted. `row("UpperCase" varchar)`
The connector quotes the fields for a row type when auto-generating the schema;
however, the auto-generated schema must be corrected manually in the collection
to match the information in the tables.

Manually altered fields must be explicitly quoted, for example, `row("UpperCase"
varchar)`.

| Field | Required | Type | Description |
| -------- | -------- | ------ | ------------------------------------------------------------------------------------------- |
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