From: drh <>
Date: Wed, 29 May 2024 15:08:20 +0000 (+0000)
Subject: Use a heuristic of artifically lowering the cost of fact tables in a
X-Git-Tag: version-3.47.0~370
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c327bd0354f253d105f029d5b81590342236838d;p=thirdparty%2Fsqlite.git

Use a heuristic of artifically lowering the cost of fact tables in a
star-schema query in order to prevent plans where the fact tables are
in outer loops from being trimmed by the path limiter.  This helps to
generate better (faster) query plans in those particular cases.

FossilOrigin-Name: 38db9b5c83dfb3021333365b2f6b11e3b54afd7033e9f4dadf0c0df1d4b082d8
---

c327bd0354f253d105f029d5b81590342236838d
diff --cc manifest
index ada3a3fbf8,87b3f96cd0..21fc713357
--- a/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C [forum:/forumpost/c9b8d923d5|Fix\ssqldiff\sout-of-bounds\schar\sclassification\serror\smentioned\sin\sthe\sforum.]
- D 2024-05-29T03:35:40.577
 -C Change\san\sassert()\s(incorrectly)\sadded\sby\sthe\sprevious\scheck-in\sinto\sa\ntestcase().
 -D 2024-05-29T14:32:22.539
++C Use\sa\sheuristic\sof\sartifically\slowering\sthe\scost\sof\sfact\stables\sin\sa\nstar-schema\squery\sin\sorder\sto\sprevent\splans\swhere\sthe\sfact\stables\sare\nin\souter\sloops\sfrom\sbeing\strimmed\sby\sthe\spath\slimiter.\s\sThis\shelps\sto\ngenerate\sbetter\s(faster)\squery\splans\sin\sthose\sparticular\scases.
++D 2024-05-29T15:08:20.872
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+ U drh
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  # Remove this line to create a well-formed Fossil manifest.
diff --cc manifest.uuid
index 9d57e9af9c,4b2f92a750..0234c23118
--- a/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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