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Update formats.md

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docs/en/interfaces/formats.md
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@ -1385,8 +1385,9 @@ Below is a comparison of the formats `RawBLOB` and [TabSeparatedRaw](#tabseparat
The following is a comparison of the `RawBLOB` and [RowBinary](#rowbinary) formats.
`RawBLOB`:
- strings are output without their length.
- strings are represented as length in varint format (unsigned [LEB128] (https://en.wikipedia.org/wiki/LEB128)), followed by the bytes of the string.
- String fields are output without being prefixed by length.
`RowBinary`:
- String fields are represented as length in varint format (unsigned [LEB128] (https://en.wikipedia.org/wiki/LEB128)), followed by the bytes of the string.
When an empty data is passed to the `RawBLOB` input, ClickHouse throws an exception: