In partial index scans, if the WHERE clause implies a constant value for a table...

FossilOrigin-Name: 8d4160910d6512469cb0a060b89c2509dde1c8e33d9358034d7fb39cd494eabe

diff --cc manifest
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--- 1/manifest
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- C Enable\s-Wall\sfor\sthe\scompiler\son\s--enable-debug\sbuilds.
- D 2023-09-25T14:20:07.380
 -C Another\svery\sminor\stweak\sto\scode\son\sthis\sbranch\sto\ssave\scycles.
 -D 2023-09-25T17:21:53.474
++C In\spartial\sindex\sscans,\sif\sthe\sWHERE\sclause\simplies\sa\sconstant\svalue\sfor\sa\stable\scolumn,\sreplace\soccurences\sof\sthat\stable\scolumn\swith\sthe\sconstant.\sThis\sincreases\sthe\slikelihood\sof\sthe\spartial\sindex\sbeing\sa\scovering\sindex.
++D 2023-09-25T17:46:02.262
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diff --cc manifest.uuid
index b8d5e01fa43ed12b02e22d54c4b4f8d516ad08ed,4fb2645b3c403b78168043a9b488b93e51cf6bed..2213ddb52f0a49ce635d22197ea09228542829c1
--- 1/manifest.uuid
--- 2/manifest.uuid
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