When the same index is used for all OR-terms in a WHERE clause, then try to

use that index as a covering index.

FossilOrigin-Name: 62678be3df35cdcb09172ba8c860f7b73517f1ea

diff --cc manifest
index 09414718bc0cf9ee7dc5bf0f0b25d8c4a7f104bb,2bf121ccfb38b80e24744e647ed2804f72254fe4..f48746c07cb9628762d4788aa8789687d8ae2ed9
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Merge\sthe\snested\saggregate\squery\senhancements\sinto\strunk.
- D 2012-08-24T01:07:52.214
 -C Move\sfield\sWhereLevel.pCovidx\sinside\sthe\sunion\sto\sWhereLevel.u.pCovidx.
 -D 2012-08-24T23:24:15.128
++C When\sthe\ssame\sindex\sis\sused\sfor\sall\sOR-terms\sin\sa\sWHERE\sclause,\sthen\stry\sto\nuse\sthat\sindex\sas\sa\scovering\sindex.
++D 2012-08-24T23:56:19.679
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in abd5c10d21d1395f140d9e50ea999df8fa4d6376
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -1012,7 -1013,7 +1013,7 @@@ F tool/vdbe-compress.tcl d70ea6d8a19e35
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
  F tool/win/sqlite.vsix 67d8a99aceb56384a81b3f30d6c71743146d2cc9
- P 20f184f2d5908badd9d44d4fe2ad7c9e182c8803 00b1dc71be4c3420730b5f7840af824ea86165e7
- R c1fab8e17aa8935c76d7626b4d7fe139
 -P 5499af53ebcdc21ae288aa2347aa21f6891d79ef
++P d4cd6017c9875947a05b1dc36538d4272fb18739 b722143d075979ba3d92b7b29e576ce2307187d1
+ R d51bc6dccf316fa29f046fa529eea646
  U drh
- Z 3e9a3890be18a0a197379668b716e1a3
 -Z cc4f76d0f6e610d4f3bf10f9821bb4e6
++Z 88e4cd6b2ce7efc36bc2db59aa6b0ac5

diff --cc manifest.uuid
index 78d216df97d750a6266e9cb207f59b368acebba1,8a0b944a2970e44ab40eaa408b7cb1faf927b4ed..100c67b276c997f9c6adea44085952c3c7755e90
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- d4cd6017c9875947a05b1dc36538d4272fb18739
 -b722143d075979ba3d92b7b29e576ce2307187d1
++62678be3df35cdcb09172ba8c860f7b73517f1ea