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"How Query Engines Work" by Andy Grove, you build one in Kotlin: https://leanpub.com/how-query-engines-work

The author also made it available for free at https://howqueryengineswork.com/00-introduction.html

On implementation, my favourite is "Database Design and Implementation" by Ed Sciore, you write a relational DB in Java, including the parser.

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> "How Query Engines Work" by Andy Grove, you build one in Kotlin: https://leanpub.com/how-query-engines-work

I have come across this, but unfortunately it feels like a book written for someone who already knows the topic. For example, the logical plans did not even bother explaining what logical plans are, where it fits into the whole picture etc https://howqueryengineswork.com/05-logical-plan.html

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