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).
There are similar functions to access or construct other Nix data types, including attribute sets and lists. The macro warn!() calls a host function that prints out a message to stderr.
，更多细节参见Line官方版本下载
val vt = oldClosure.vparams.head.tpt.tpe
第五十三条 有下列行为之一的，处五日以下拘留或者警告；情节较重的，处五日以上十日以下拘留，可以并处一千元以下罚款：