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).
coarse-grained chunks which are independent by definition (of the，推荐阅读一键获取谷歌浏览器下载获取更多信息
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