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docs: Clarify that proto2 and proto3 are supported

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#2369
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Leopold Schabel 2019-02-28 10:45:30 +00:00 committed by GitHub
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docs/en/interfaces/formats.md
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@ -597,6 +597,8 @@ See also [Format Schema](#formatschema).
Protobuf - is a [Protocol Buffers](https://developers.google.com/protocol-buffers/) format. Protobuf - is a [Protocol Buffers](https://developers.google.com/protocol-buffers/) format.
ClickHouse supports both `proto2` and `proto3`. Repeated/optional/required fields are supported.
This format requires an external format schema. The schema is cached between queries. This format requires an external format schema. The schema is cached between queries.
Usage examples: Usage examples:
@ -642,7 +644,7 @@ message MessageType {
ClickHouse tries to find a column named `x.y.z` (or `x_y_z` or `X.y_Z` and so on). ClickHouse tries to find a column named `x.y.z` (or `x_y_z` or `X.y_Z` and so on).
Nested messages are suitable to input or output a [nested data structures](../data_types/nested_data_structures/nested/). Nested messages are suitable to input or output a [nested data structures](../data_types/nested_data_structures/nested/).
Default values defined in the protobuf schema like this Default values defined in a `proto2` protobuf schema like this
``` ```
message MessageType { message MessageType {