Improve the automatic-index decision such that no attempt is made to create

an automatic index on a column that is known to be non-selective because if
its use in other indexes that have been analyzed.  See
[src:/tktview/8ff324e120|ticket 8ff324e120] and
[forum:/forumpost/b21c2101a559be0a|forum post b21c2101a559be0a].

FossilOrigin-Name: 2a7603c327d11d5e6bc4d40c29151fea544d650f51200ff76efb921adb0c38df

diff --cc manifest
index bd1edcd5708333b5ff099142ae91af535b23b264,d844021f66db5e0b90142cab26333b3ca8552917..b3acb600f91ce0e53b282ce8a3dba2e5790e0354
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Query\splanner\stuning:\s\sIncrease\sthe\smaximum\snumber\sof\ssimultaneous\ssolutions\nto\strack\sint\seh\ssolver\sfrom\s10\sto\s12.
- D 2024-05-28T00:01:07.835
 -C Avoid\screating\san\sautomatic\sindex\son\sa\scolumn\sthat\sis\sknown\sto\sbe\snot\svery\nselective.
 -D 2024-05-27T21:55:01.258
++C Improve\sthe\sautomatic-index\sdecision\ssuch\sthat\sno\sattempt\sis\smade\sto\screate\nan\sautomatic\sindex\son\sa\scolumn\sthat\sis\sknown\sto\sbe\snon-selective\sbecause\sif\nits\suse\sin\sother\sindexes\sthat\shave\sbeen\sanalyzed.\s\sSee\n[src:/tktview/8ff324e120|ticket\s8ff324e120]\sand\n[forum:/forumpost/b21c2101a559be0a|forum\spost\sb21c2101a559be0a].
++D 2024-05-28T00:16:52.505
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -840,7 -840,7 +840,7 @@@ F src/vxworks.h d2988f4e5a61a4dfe82c652
  F src/wal.c 887fc4ca3f020ebb2e376f222069570834ac63bf50111ef0cbf3ae417048ed89
  F src/wal.h ba252daaa94f889f4b2c17c027e823d9be47ce39da1d3799886bbd51f0490452
  F src/walker.c 7c7ea0115345851c3da4e04e2e239a29983b61fb5b038b94eede6aba462640e2
- F src/where.c dd7d9eb570c35caf94797814f9d54b187175bd21966f7f4dfd36b0c1f63aa501
 -F src/where.c 555c75e91b44b8f575579eea4f2cf86c419ab4e79e44ce546e399a60cd3020e2
++F src/where.c ad4866c036a9d64f0c79ccf2ec60ac65bb64cb81b9facce453b0a920caac7a1d
  F src/whereInt.h 82a13766f13d1a53b05387c2e60726289ef26404bc7b9b1f7770204d97357fb8
  F src/wherecode.c d5184620bcb5265d59072cb66e1386bfe0331a9ce7614286f9ab79a4fcd00fb8
  F src/whereexpr.c 67d15caf88a1a9528283d68ff578e024cf9fe810b517bb0343e5aaf695ad97dd
@@@ -2193,8 -2193,11 +2193,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
--P 1b6d1fbcdecf14bc79dc7b5df50e585d2fcc1484a9987b863c190e8f7ba2c39f
- R 81c36ec13694e48008fb110fd73a5f00
 -R 33d42e8c7f39f01a63aa7a9a3cae7431
 -T *branch * auto-index-improvements
 -T *sym-auto-index-improvements *
 -T -sym-trunk *
++P fe2e1dadbacbe6392ceed44fd287a2ed82189cb8055f35631d37967d9a7a5d1d 70409763f70faa2a0f4f072fd318a687b109a0905cc57906ad7f80d2885fe6d9
++R a2e2cddff59ec6ba73015ce8c07a73b7
++T +closed 70409763f70faa2a0f4f072fd318a687b109a0905cc57906ad7f80d2885fe6d9
  U drh
- Z 108dc3aeba08b8d2b68875bf68eaf849
 -Z ae3dc9b91b8cb58bdaacbf4b44d36f22
++Z 8ce1e608e60c39ba63116e451ee082d8
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 49840006bbbee48c2058e6689a5b38a65b42f6e1,0233074f46942f546feda60351561f27423991f4..57d33a3566719727900da13c8a9d783e1e2bce19
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- fe2e1dadbacbe6392ceed44fd287a2ed82189cb8055f35631d37967d9a7a5d1d
 -70409763f70faa2a0f4f072fd318a687b109a0905cc57906ad7f80d2885fe6d9
++2a7603c327d11d5e6bc4d40c29151fea544d650f51200ff76efb921adb0c38df

diff --cc src/where.c
Simple merge