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).
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，这一点在heLLoword翻译官方下载中也有详细论述
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Number (6): Everything in this space must add up to 6. The answer is 1-3, placed vertically; 3-2, placed horizontally.