Enhancements to covering-index prediction. In particular, avoid the

false-positive prediction described by
[forum:/forumpost/e60e4c295d22f8ce|forum post e60e4c295d22f8ce].
Add early detection of over-prediction of covering-indexes so that
sqlite3_prepare() will return an error rather than just generate bad
bytecode.

FossilOrigin-Name: f0b671183f44d0ae294956e7651a1653f47bd6219f9636872d15993f30f28dfb

diff --cc manifest
index 6a5cc4cb817f4e3e5b5ae164d58fd0054d7c6707,9e972f428b6e3706a1586a294cc2504e05d21c9d..8f752559c5358017fa3907d1db38ff144a54667e
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Add\san\sassert()\sto\sfix\sa\sharmless\scompiler\swarning\sin\sthe\srecovery\nextension.
- D 2024-08-10T09:56:36.016
 -C Import\sthe\ssecond\sALTER\sTABLE\sfix\sfrom\strunk.
 -D 2024-08-09T18:53:02.857
++C Enhancements\sto\scovering-index\sprediction.\s\sIn\sparticular,\savoid\sthe\nfalse-positive\sprediction\sdescribed\sby\n[forum:/forumpost/e60e4c295d22f8ce|forum\spost\se60e4c295d22f8ce].\nAdd\searly\sdetection\sof\sover-prediction\sof\scovering-indexes\sso\sthat\nsqlite3_prepare()\swill\sreturn\san\serror\srather\sthan\sjust\sgenerate\sbad\nbytecode.
++D 2024-08-10T10:05:22.244
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -2204,8 -2204,8 +2204,9 @@@ F vsixtest/vsixtest.tcl 6195aba1f12a5e1
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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 -R a3984f1bb6f081096bb3871ebe43a6fd
++P 2502339339f3c831966479a400c2b1a531fb4d990b1776b4dc4870cf734c3fcd 1de3e5883613ff6093203720f3cdcf6b3a3e626c99735284fae95a438e1ce24f
++R aaaa5a801913afe54fe71ced56170454
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  U drh
- Z fb95dff972d2b07ca88b4d892cd693f5
 -Z 4b72616d18b38c73609a43a2c780b02c
++Z ad30efef8eafa3ff536c4ae2785bb388
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 9adeda1d93ef42526e97ba49110796fcdb498371,21dade1b68260be7bd8a102c1d3e1f4385a3a80d..e7d37495c74bc828d106b27e0c77f7afca4612c3
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 2502339339f3c831966479a400c2b1a531fb4d990b1776b4dc4870cf734c3fcd
 -1de3e5883613ff6093203720f3cdcf6b3a3e626c99735284fae95a438e1ce24f
++f0b671183f44d0ae294956e7651a1653f47bd6219f9636872d15993f30f28dfb