So it would always take the standard library version first in case we added things to the standard library, but otherwise it would take it from the xmlplus package.
JIT compilation was introduced in Postgres 11 in 2018. It solves a problem of Postgres having to interpret expressions and use inefficient per-row loops in run-time in order to do internal data conversions (so-called tuple deforming).
，这一点在clash下载中也有详细论述
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