Add the union-vtab extension - still experimental and under active

development.

FossilOrigin-Name: 948f95046b7eaa8c68617b36625a7500dd0e69e52425ac6d748f2a311eb2474a

diff --cc manifest
index d3d4326371ab0fbbbf183ba471e521ac6710acf1,b7bfbbc7dd7754cf6268eab6264c4ad82cb9f24e..60c57e70884f8f020ba5abb6b60006841c69c27e
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,6 -1,6 +1,6 @@@
- C Do\snot\suse\sthe\sflattening\soptimization\sfor\sa\ssub-query\son\sthe\sRHS\sof\sa\sLEFT\nJOIN\sif\sthat\ssubquery\sreads\sdata\sfrom\sa\svirtual\stable.\sBecause\sit\sprevents\sthe\nplanner\sfrom\screating\san\sautomatic\sindex\son\sthe\sresults\sof\sthe\ssub-query,\sthe\nflattening\soptimization\ssometimes\sslows\sthings\sdown\sin\sthis\scase.
- D 2017-07-18T17:34:41.909
- F Makefile.in eda8bedf08c4c93e2137ef1218b3d3302488c68c2774918de0335a1133aab157
 -C Add\stest\scases\sto\stest/unionvtab.test.
 -D 2017-07-17T21:03:13.376
++C Add\sthe\sunion-vtab\sextension\s-\sstill\sexperimental\sand\sunder\sactive\ndevelopment.
++D 2017-07-18T18:19:35.178
+ F Makefile.in d9873c9925917cca9990ee24be17eb9613a668012c85a343aef7e5536ae266e8
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc 20850e3e8d4d4791e0531955852d768eb06f24138214870d543abb1a47346fba
  F README.md f5c87359573c4d255425e588a56554b50fdcc2afba4e017a2e02a43701456afd
@@@ -1633,7 -1635,7 +1635,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P d2f0b2e859a8a413ee4e4bd7040e450ccd604069e4ea8dbc9ff924718c2b14d7
- R 3c4759ced4ce8b0061743bb6c4533a26
 -P 9c3f1b9a82e500e015deb0cc669fbb32e7f0cdc69f926ceff383ab946f8d8d18
 -R 6402ecef7e1ef347a2198f92e57df782
--U dan
- Z 85b03bc1ee316c41d181881cd7406dfe
 -Z 341cfe880d68a3cd0fd3e9a065c71b11
++P 9dbae1df75219e2accd8993015ce0ffc21966d7e69d04178b1a2cc46207fe260 f2c4a584e83ffcc1cedd39460eb06d6f231a1a87f269bb3e75055232a866067e
++R 22688c3ff114a75547dc23b352f32b8f
++T +closed f2c4a584e83ffcc1cedd39460eb06d6f231a1a87f269bb3e75055232a866067e
++U drh
++Z 795d41abc0655f6af75662d51713271a

diff --cc manifest.uuid
index 16976f905b9f1e08cff9240800863913f33c089b,1cd063335322f92c527072f9ea6ad78e9fc36691..e3ce600c158091ee4af23fb338c1d8aa78900c74
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 9dbae1df75219e2accd8993015ce0ffc21966d7e69d04178b1a2cc46207fe260
 -f2c4a584e83ffcc1cedd39460eb06d6f231a1a87f269bb3e75055232a866067e
++948f95046b7eaa8c68617b36625a7500dd0e69e52425ac6d748f2a311eb2474a