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Update roadmap.md

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- JOIN syntax compatible with SQL standard: - JOIN syntax compatible with SQL standard:
- Mutliple `JOIN`s in single `SELECT` - Mutliple `JOIN`s in single `SELECT`
- Protobuf and Parquet input and output formats
## Q1 2019
- Import/export from HDFS and S3
- Lower metadata size in ZooKeeper
- Adaptive index granularity for MergeTree engine family
## Q2 2019
- JOIN execution improvements: - JOIN execution improvements:
- Distributed join not limited by memory - Distributed join not limited by memory
- Protobuf and Parquet input and output formats
- Resource pools for more precise distribution of cluster capacity between users - Resource pools for more precise distribution of cluster capacity between users
## Q3 2019
- Fine-grained authorization
- Integration with external authentication services
[Original article](https://clickhouse.yandex/docs/en/roadmap/) <!--hide--> [Original article](https://clickhouse.yandex/docs/en/roadmap/) <!--hide-->