BM25 是一种用于信息检索的排名函数，用于衡量查询与文档的相关性。它基于词频（t）和文档长度进行加权计算，同时考虑逆文档频率（IDF）以惩罚常见词。在整个公式中，需重点关注总文档数 N 和文档频率 DF 等全局统计信息，这些信息直接影响实现的难度。（更多信息可自行搜索查阅） ...

京东白条使用 Apache ShardingSphere 解决了千亿数据存储和扩容的问题，为大促活动奠定了基础。 2014 年初，“京东白条”作为业内互联网信用支付产品，数据量爆发式的增长，每一次大促备战都是对技术人员的考验，每一次的战略转型驱动着数据架构的成长。

The open source, massively parallel processing (MPP) analytical database will take on the likes of ClickHouse, MariaDB, Apache Druid, Apache Pinot, and hyperscaler services such as Google BigQuery, ...

Apache Phoenix is a relatively new open source Java project that provides a JDBC driver and SQL access to Hadoop’s NoSQL database: HBase. It was created as an internal project at Salesforce, open ...

Unlock the full InfoQ experience by logging in! Stay updated with your favorite authors and topics, engage with content, and download exclusive resources. Vivek Yadav, an engineering manager from ...

谷歌承诺为机器学习和数据分析提供单一笔记本环境，将SQL、Python和Apache Spark集成在一个平台中。 读者可能会注意到，数据 ...

Google is promising a single notebook environment for machine learning and data analytics, integrating SQL, Python, and Apache Spark in one place.… Readers might note that other prominent vendors in ...

Today, at its annual Data + AI Summit, Databricks announced that it is open-sourcing its core declarative ETL framework as Apache Spark Declarative Pipelines, making it available to the entire Apache ...

We list the best SQL online courses, to make it simple and easy to learn how to mange, code, and run databases, covering everything from beginner to advanced users. The Structured Query Language or ...