neon/revisions.json at eeabecd89f89a24fa8ee642c916efd97b4e8fa06 - neon - Gitea: Git with a cup of tea

rust/neon

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Matthias van de Meent 597125e124 Disable readstream's reliance on seqscan readahead (#9860 )

Neon doesn't have seqscan detection of its own, so stop read_stream from
trying to utilize that readahead, and instead make it issue readahead of
its own.

## Problem

@knizhnik noticed that we didn't issue smgrprefetch[v] calls for
seqscans in PG17 due to the move to the read_stream API, which assumes
that the underlying IO facilities do seqscan detection for readahead.
That is a wrong assumption when Neon is involved, so let's remove the
code that applies that assumption.

## Summary of changes
Remove the cases where seqscans are detected and prefetch is disabled as
a consequence, and instead don't do that detection.

PG PR: https://github.com/neondatabase/postgres/pull/532

2024-12-11 00:51:05 +00:00

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Raw Blame History

 {
   "v17": [
     "17.2",
     "01fa3c48664ca030cfb69bb4a350aa9df4691d88"
   ],
   "v16": [
     "16.6",
     "81428621f7c04aed03671cf80a928e0a36d92505"
   ],
   "v15": [
     "15.10",
     "8736b10c1d93d11b9c0489872dd529c4c0f5338f"
   ],
   "v14": [
     "14.15",
     "13ff324150fceaac72920e01742addc053db9462"
   ]
 }