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docs/en/sql-reference/data-types/data-types-binary-encoding.md
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@ -7,6 +7,11 @@ sidebar_label: Data types binary encoding specification.
# Data types binary encoding specification
This specification describes the binary format that can be used for binary encoding and decoding of ClickHouse data types. This format is used in `Dynamic` column [binary serialization](dynamic.md#binary-output-format) and can be used in input/output formats [RowBinaryWithNamesAndTypes](../../interfaces/formats.md#rowbinarywithnamesandtypes) and [Native](../../interfaces/formats.md#native) under corresponding settings.
The table below describes how each data type is represented in bunary format. Each data type encoding consist of 1 byte that indicates the type and some optional additional information.
`var_uint` in the binary encoding means that the size is encoded using Variable-Length Quantity compression.
| ClickHouse data type | Binary encoding |
|--------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `Nothing` | `0x00` |
@ -61,6 +66,8 @@ sidebar_label: Data types binary encoding specification.
### Interval kind binary encoding
The table below describes how different interval kinds of `Interval` data type are endoced.
| Interval kind | Binary encoding |
|---------------|-----------------|
| `Nanosecond` | `0x00` |
@ -77,6 +84,9 @@ sidebar_label: Data types binary encoding specification.
### Aggregate function parameter binary encoding
The table below describes how parameters of `AggragateFunction` and `SimpleAggregateFunction` are encoded.
The encoding of a parameter consists of 1 byte indicating the type of the parameter and the value itself.
| Parameter type | Binary encoding |
|--------------------------|--------------------------------------------------------------------------------------------------------------------------------|
| `Null` | `0x00` |