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That's not true, Spark's entire query engine relies on use of runtime codegen via macros/quasi quotes

Look up the architecture of Catalyst + Tungsten

Scala 2's macros are compile time constructs. There is no runtime code generation / staging.

Scala 3's macros support staged compilation, so you can have macros which create code in later stages at runtime.

Catalyst uses runtime codegen, sure, but the OP wasn't using that.