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