Omit tables from the FROM clause of a join if their presence makes no difference

in the final output.

FossilOrigin-Name: 6505e2ab0200736c525b5cfcf1cb62c0bd4d18ee

diff --cc manifest
index 57254857ae971e43defda5220b886cc9a24bc848,1bb860ddcd466aceb433ac83e65845e4f9a81355..7c428a8726b52496911340022965b51cf6e390b4
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Cut\sover\sthe\snext\sgeneration\squery\splanner.\s\sIncrease\sthe\sversion\snumber\nto\s3.8.0.
- D 2013-06-26T11:43:18.908
 -C Add\sthe\sability\sto\sdisable\sthe\somit-join-table\soptimization\sfor\stesting\npurposes.
 -D 2013-06-22T15:44:26.893
++C Omit\stables\sfrom\sthe\sFROM\sclause\sof\sa\sjoin\sif\stheir\spresence\smakes\sno\sdifference\nin\sthe\sfinal\soutput.
++D 2013-06-26T11:49:45.741
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -1097,7 -1096,7 +1097,7 @@@ F tool/warnings-clang.sh f6aa929dc20ef1
  F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
  F tool/wherecosttest.c f407dc4c79786982a475261866a161cd007947ae
  F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
- P 096ae1d8f9a08f92daedece6b0615f4d22b05023 19ab4811d542ba781aeb6a4eb3c74642677225e1
- R f73808040fac6ead247f9d2a50c342d8
 -P d7a25cc79794817504ca1a4262008a68b2a4dece
 -R ca6216e1e7f1e0a7cea14bc87e274a42
++P 0fe31f60cadc5fe5a9d87e110bfaed5fd026cba1 d929df9b1ba214c27d8c437099a53ee9b07aa169
++R ecf2ce720691ade8fe3e2ee9fb8dd238
  U drh
- Z e52529fd895183a80c4903c58cf391c1
 -Z 6a72a8bdf1b2e20868f42b8b65540410
++Z ab0b31ee952c7e0dabeb8c9962096a79

diff --cc manifest.uuid
index de60777b86f9916b5153e8fa951d97eae79cec90,f7dd8d6565b97d3195e035e79b2b582d142adbd5..99bda3b211ca5b5897055de4cfcbbf3f5f1da7cc
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 0fe31f60cadc5fe5a9d87e110bfaed5fd026cba1
 -d929df9b1ba214c27d8c437099a53ee9b07aa169
++6505e2ab0200736c525b5cfcf1cb62c0bd4d18ee