Only consider AS names from the result set as candidates for resolving

identifiers in the WHERE clause if there are no other matches.
In the ORDER BY clause, AS names take priority over any column names.
Fix for ticket [2500cdb9be].

FossilOrigin-Name: d0d5af79a005de30194863c57c5018ee75e03581

diff --cc manifest
index c4d5a473e13dc59f9ebbd50673d7e6be1936a254,3a4b72859e35792c95395b337289b9d62f623220..2c5683ef6b349e9bba032187b5dcb22432906041
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Add\sa\stest\scase\sfor\sdetaching\sa\sdatabase\sreferenced\sby\san\sfts4aux\stable\screated\sin\sthe\stemp\sschema.
- D 2013-04-12T16:53:19.544
 -C Only\sconsider\sAS\snames\sfrom\sthe\sresult\sset\sas\scandidates\sfor\sresolving\nidentifiers\sin\sthe\sWHERE\sclause\sif\sthere\sare\sno\sother\smatches.\s\sIn\sthe\nORDER\sBY\sclause,\sAS\snames\stake\spriority\sover\sany\scolumn\snames.\nCandidate\sfix\sfor\sticket\s[2500cdb9be].
 -D 2013-04-13T19:59:58.676
++C Only\sconsider\sAS\snames\sfrom\sthe\sresult\sset\sas\scandidates\sfor\sresolving\nidentifiers\sin\sthe\sWHERE\sclause\sif\sthere\sare\sno\sother\smatches.\nIn\sthe\sORDER\sBY\sclause,\sAS\snames\stake\spriority\sover\sany\scolumn\snames.\nFix\sfor\sticket\s[2500cdb9be].
++D 2013-04-14T23:51:27.821
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in 3dd3fcb87b70c78d99b2c8a03e44ec86d6ca9ce2
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -1050,7 -1051,10 +1051,7 @@@ F tool/vdbe-compress.tcl f12c884766bd14
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
  F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
- P 546a187f1361dad340ed8f6c28dd89e6c19f9c33
- R 05383c39b4618f3bdf18eec38f2fc283
- U dan
- Z db66ae2fc0950c0cd2f83a29d6b2c3f8
 -P 6d6f0592abe237256dbdf30ab0ba0bb0c365dd95
++P 6d6f0592abe237256dbdf30ab0ba0bb0c365dd95 ad53924dcadffb95c6497c46c228c67e8f5370e4
+ R b0858137a1ee08b4782056449cba9377
 -T *branch * tkt-2500cdb9be
 -T *sym-tkt-2500cdb9be *
 -T -sym-trunk *
+ U drh
 -Z 489735ec39077e65a3d08cafc2217189
++Z c608eb98c484fd069203789a0c999b98

diff --cc manifest.uuid
index d1d8020d4cf669ed748bfab23d65323de130a836,ac4feed793a3c7f0021ee220eadaea427fcf03f1..1cbd0dc9a240b44dd419355f3f5d2b52ec14702b
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 6d6f0592abe237256dbdf30ab0ba0bb0c365dd95
 -ad53924dcadffb95c6497c46c228c67e8f5370e4
++d0d5af79a005de30194863c57c5018ee75e03581