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As the code stands, nEntries counts the number of ginEntryInsert() calls, so that's what you end up with at the end of a GIN index build. However, ginvacuumcleanup() recomputes nEntries as the number of surviving leaf tuples, and that's generally consistent with the way that gincostestimate() uses the value. So let's clearly define nEntries as the number of leaf tuples, and therefore adjust ginEntryInsert() to increment it only when we make a new one, not when we add TIDs into an existing tuple or posting tree. In practice this inconsistency probably has little impact, so I don't feel a need to back-patch. Insung Moon and Keisuke Kuroda Discussion: https://postgr.es/m/CAEMmqBuH_O-oXL+3_ArQ6F5cJ7kXVow2SGQB3HRacku_T+xkmA@mail.gmail.com |
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