Moreover, is it typical to have an implementation like VDBE in other databases as well?
This is a common approach and has been used for a very long time. For example we used it in products produced during the 1980s because producing a virtual machine and a compiler for its application-specific instruction set was a far better solution than masses of procedural logic. At that time it was a time honored technique and not at all innovative.
Look at how PostgreSQL compiles and stores SQL statements for background information on the concept.
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