DOCSUP-16819: Add CapnProto output format #31405
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Задокументировал формат CapnProto.
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gyuton
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Nov 19, 2021
Co-authored-by: gyuton <40863448+gyuton@users.noreply.github.com>
Добавил ссылку.
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@Avogar Please, review this PR. |
Avogar
reviewed
Nov 22, 2021
docs/en/interfaces/formats.md
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| Unsupported CapnProto data types: `TIME32`, `FIXED_SIZE_BINARY`, `JSON`, `UUID`. | ||
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| Data types of ClickHouse table columns can differ from the corresponding fields of the Parquet data inserted. When inserting data, ClickHouse interprets data types according to the table above and then [cast](../sql-reference/functions/type-conversion-functions/#type_conversion_function-cast) the data to that data type which is set for the ClickHouse table column. |
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It's about Parquet format, it's not true for CapnProto. Remove it
Avogar
reviewed
Nov 22, 2021
docs/en/interfaces/formats.md
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| ``` bash | ||
| $ cat capnproto_messages.bin | clickhouse-client --query "INSERT INTO test.hits FORMAT CapnProto SETTINGS format_schema='schema:Message'" | ||
| $ cat capnproto_messages.bin | clickhouse-client --query "INSERT INTO {some_table} FORMAT CapnProto SETTINGS format_schema = 'schema:Message'" |
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We should remain table test.hits, because we also show an examle of using the schema with fields from this table
Avogar
reviewed
Nov 22, 2021
docs/en/interfaces/formats.md
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| @@ -1109,9 +1147,13 @@ struct Message { | |||
| } | |||
| ``` | |||
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| Deserialization is effective and usually does not increase the system load. | |||
| To insert data into [Nested](../sql-reference/data-types/nested-data-structures/nested.md) columns as an array of structs values you must enable the [input_format_parquet_import_nested](../operations/settings/settings.md#input_format_parquet_import_nested) setting. | |||
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It's not connected with CapnProto format at all, remove it
Avogar
reviewed
Nov 22, 2021
docs/en/interfaces/formats.md
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| You can select data from a ClickHouse table and save them into some file in the CapnProto format by the following command: | ||
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| ``` bash | ||
| $ clickhouse-client --query = "SELECT * FROM capnp_tuples FORMAT CapnProto SETTINGS format_schema = '$CLIENT_SCHEMADIR/02030_capnp_tuples:Message'" |
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Suggested change
| $ clickhouse-client --query = "SELECT * FROM capnp_tuples FORMAT CapnProto SETTINGS format_schema = '$CLIENT_SCHEMADIR/02030_capnp_tuples:Message'" | |
| $ clickhouse-client --query = "SELECT * FROM test.hits FORMAT CapnProto SETTINGS format_schema = 'schema:Message'" |
Let's use an example with test.hits and corresponding schema from the previous example.
Avogar
reviewed
Nov 22, 2021
Avogar
reviewed
Nov 22, 2021
Avogar
reviewed
Nov 22, 2021
Поправил согласно комментариям разработчика.
…-DOCSUP-16819-add_capnproto_output_format
Avogar
approved these changes
Nov 22, 2021
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