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105 lines
6.8 KiB
Markdown
105 lines
6.8 KiB
Markdown
---
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toc_priority: 70
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toc_title: Third-Party Libraries Used
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---
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# Third-Party Libraries Used {#third-party-libraries-used}
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The list of third-party libraries can be obtained by the following query:
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``` sql
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SELECT library_name, license_type, license_path FROM system.licenses ORDER BY library_name COLLATE 'en';
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```
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[Example](https://gh-api.clickhouse.tech/play?user=play#U0VMRUNUIGxpYnJhcnlfbmFtZSwgbGljZW5zZV90eXBlLCBsaWNlbnNlX3BhdGggRlJPTSBzeXN0ZW0ubGljZW5zZXMgT1JERVIgQlkgbGlicmFyeV9uYW1lIENPTExBVEUgJ2VuJw==)
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| library_name | license_type | license_path |
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|:-|:-|:-|
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| abseil-cpp | Apache | /contrib/abseil-cpp/LICENSE |
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| AMQP-CPP | Apache | /contrib/AMQP-CPP/LICENSE |
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| arrow | Apache | /contrib/arrow/LICENSE.txt |
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| avro | Apache | /contrib/avro/LICENSE.txt |
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| aws | Apache | /contrib/aws/LICENSE.txt |
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| aws-c-common | Apache | /contrib/aws-c-common/LICENSE |
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| aws-c-event-stream | Apache | /contrib/aws-c-event-stream/LICENSE |
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| aws-checksums | Apache | /contrib/aws-checksums/LICENSE |
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| base64 | BSD 2-clause | /contrib/base64/LICENSE |
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| boost | Boost | /contrib/boost/LICENSE_1_0.txt |
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| boringssl | BSD | /contrib/boringssl/LICENSE |
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| brotli | MIT | /contrib/brotli/LICENSE |
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| capnproto | MIT | /contrib/capnproto/LICENSE |
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| cassandra | Apache | /contrib/cassandra/LICENSE.txt |
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| cctz | Apache | /contrib/cctz/LICENSE.txt |
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| cityhash102 | MIT | /contrib/cityhash102/COPYING |
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| cppkafka | BSD 2-clause | /contrib/cppkafka/LICENSE |
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| croaring | Apache | /contrib/croaring/LICENSE |
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| curl | Apache | /contrib/curl/docs/LICENSE-MIXING.md |
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| cyrus-sasl | BSD 2-clause | /contrib/cyrus-sasl/COPYING |
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| double-conversion | BSD 3-clause | /contrib/double-conversion/LICENSE |
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| dragonbox | Apache | /contrib/dragonbox/LICENSE-Apache2-LLVM |
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| fast_float | Apache | /contrib/fast_float/LICENSE |
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| fastops | MIT | /contrib/fastops/LICENSE |
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| flatbuffers | Apache | /contrib/flatbuffers/LICENSE.txt |
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| fmtlib | Unknown | /contrib/fmtlib/LICENSE.rst |
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| gcem | Apache | /contrib/gcem/LICENSE |
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| googletest | BSD 3-clause | /contrib/googletest/LICENSE |
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| grpc | Apache | /contrib/grpc/LICENSE |
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| h3 | Apache | /contrib/h3/LICENSE |
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| hyperscan | Boost | /contrib/hyperscan/LICENSE |
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| icu | Public Domain | /contrib/icu/icu4c/LICENSE |
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| icudata | Public Domain | /contrib/icudata/LICENSE |
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| jemalloc | BSD 2-clause | /contrib/jemalloc/COPYING |
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| krb5 | MIT | /contrib/krb5/src/lib/gssapi/LICENSE |
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| libc-headers | LGPL | /contrib/libc-headers/LICENSE |
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| libcpuid | BSD 2-clause | /contrib/libcpuid/COPYING |
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| libcxx | Apache | /contrib/libcxx/LICENSE.TXT |
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| libcxxabi | Apache | /contrib/libcxxabi/LICENSE.TXT |
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| libdivide | zLib | /contrib/libdivide/LICENSE.txt |
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| libfarmhash | MIT | /contrib/libfarmhash/COPYING |
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| libgsasl | LGPL | /contrib/libgsasl/LICENSE |
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| libhdfs3 | Apache | /contrib/libhdfs3/LICENSE.txt |
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| libmetrohash | Apache | /contrib/libmetrohash/LICENSE |
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| libpq | Unknown | /contrib/libpq/COPYRIGHT |
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| libpqxx | BSD 3-clause | /contrib/libpqxx/COPYING |
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| librdkafka | MIT | /contrib/librdkafka/LICENSE.murmur2 |
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| libunwind | Apache | /contrib/libunwind/LICENSE.TXT |
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| libuv | BSD | /contrib/libuv/LICENSE |
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| llvm | Apache | /contrib/llvm/llvm/LICENSE.TXT |
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| lz4 | BSD | /contrib/lz4/LICENSE |
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| mariadb-connector-c | LGPL | /contrib/mariadb-connector-c/COPYING.LIB |
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| miniselect | Boost | /contrib/miniselect/LICENSE_1_0.txt |
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| msgpack-c | Boost | /contrib/msgpack-c/LICENSE_1_0.txt |
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| murmurhash | Public Domain | /contrib/murmurhash/LICENSE |
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| NuRaft | Apache | /contrib/NuRaft/LICENSE |
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| openldap | Unknown | /contrib/openldap/LICENSE |
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| orc | Apache | /contrib/orc/LICENSE |
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| poco | Boost | /contrib/poco/LICENSE |
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| protobuf | BSD 3-clause | /contrib/protobuf/LICENSE |
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| rapidjson | MIT | /contrib/rapidjson/bin/jsonschema/LICENSE |
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| re2 | BSD 3-clause | /contrib/re2/LICENSE |
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| replxx | BSD 3-clause | /contrib/replxx/LICENSE.md |
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| rocksdb | BSD 3-clause | /contrib/rocksdb/LICENSE.leveldb |
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| s2geometry | Apache | /contrib/s2geometry/LICENSE |
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| sentry-native | MIT | /contrib/sentry-native/LICENSE |
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| simdjson | Apache | /contrib/simdjson/LICENSE |
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| snappy | Public Domain | /contrib/snappy/COPYING |
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| sparsehash-c11 | BSD 3-clause | /contrib/sparsehash-c11/LICENSE |
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| stats | Apache | /contrib/stats/LICENSE |
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| thrift | Apache | /contrib/thrift/LICENSE |
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| unixodbc | LGPL | /contrib/unixodbc/COPYING |
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| xz | Public Domain | /contrib/xz/COPYING |
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| zlib-ng | zLib | /contrib/zlib-ng/LICENSE.md |
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| zstd | BSD | /contrib/zstd/LICENSE |
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## Guidelines for adding new third-party libraries and maintaining custom changes in them {#adding-third-party-libraries}
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1. All external third-party code should reside in the dedicated directories under `contrib` directory of ClickHouse repo. Prefer Git submodules, when available.
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2. Fork/mirror the official repo in [Clickhouse-extras](https://github.com/ClickHouse-Extras). Prefer official GitHub repos, when available.
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3. Branch from the branch you want to integrate, e.g., `master` -> `clickhouse/master`, or `release/vX.Y.Z` -> `clickhouse/release/vX.Y.Z`.
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4. All forks in [Clickhouse-extras](https://github.com/ClickHouse-Extras) can be automatically synchronized with upstreams. `clickhouse/...` branches will remain unaffected, since virtually nobody is going to use that naming pattern in their upstream repos.
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5. Add submodules under `contrib` of ClickHouse repo that refer the above forks/mirrors. Set the submodules to track the corresponding `clickhouse/...` branches.
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6. Every time the custom changes have to be made in the library code, a dedicated branch should be created, like `clickhouse/my-fix`. Then this branch should be merged into the branch, that is tracked by the submodule, e.g., `clickhouse/master` or `clickhouse/release/vX.Y.Z`.
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7. No code should be pushed in any branch of the forks in [Clickhouse-extras](https://github.com/ClickHouse-Extras), whose names do not follow `clickhouse/...` pattern.
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8. Always write the custom changes with the official repo in mind. Once the PR is merged from (a feature/fix branch in) your personal fork into the fork in [Clickhouse-extras](https://github.com/ClickHouse-Extras), and the submodule is bumped in ClickHouse repo, consider opening another PR from (a feature/fix branch in) the fork in [Clickhouse-extras](https://github.com/ClickHouse-Extras) to the official repo of the library. This will make sure, that 1) the contribution has more than a single use case and importance, 2) others will also benefit from it, 3) the change will not remain a maintenance burden solely on ClickHouse developers.
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9. When a submodule needs to start using a newer code from the original branch (e.g., `master`), and since the custom changes might be merged in the branch it is tracking (e.g., `clickhouse/master`) and so it may diverge from its original counterpart (i.e., `master`), a careful merge should be carried out first, i.e., `master` -> `clickhouse/master`, and only then the submodule can be bumped in ClickHouse.
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