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# Changelog for odc
## 1.6.0
* Add a new LongConstantString codec which permits encoding constant columns where the constant is a string > 8 characters in length.
* This saves 1 byte per row compared the previous way these columns were encoded.
* A python implementation has been added to pyodc at the same time, version 1.5.0
* Decoding data using this codec will work straight away.
* Encoding data with the new codec is disabled by default and can be enabled with the environment variable "ODC_ENABLE_WRITING_LONG_STRING_CODEC=1".
* At some point in a future release, encoding will be enabled by default.
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