Mark a single branch within sqlite3SelectExpand() as an optimization.

FossilOrigin-Name: 3a4ffb21d0ee2326c31b9ddc512d79d4ebf3a249a2840e88e99165978eec31fd

manifest

@@ -1,5 +1,5 @@
-C Simplification\sto\ssqlite3SelectPrep()\sfor\simproved\stestability.
-D 2017-10-02T23:30:45.503
+C Mark\sa\ssingle\sbranch\swithin\ssqlite3SelectExpand()\sas\san\soptimization.
+D 2017-10-02T23:50:08.350
 F Makefile.in 4bc36d913c2e3e2d326d588d72f618ac9788b2fd4b7efda61102611a6495c3ff
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 6033b51b6aea702ea059f6ab2d47b1d3cef648695f787247dd4fb395fe60673f
@@ -458,7 +458,7 @@ F src/printf.c 40aee47ae9be4bd3dbdc8968bd07fddc027be8edec8daddf24d3391d36698a1c
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 4324a94573b1e29286f8121e4881db59eaedc014afeb274c8d3e07ed282e0e20
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
-F src/select.c c12d9b45c31182921c2aea5ab11bc0add480c6e3b47cb3400edecbbf97000fd0
+F src/select.c 3e3fb2e45e26fe5f12d1765e6c40c57762977f36a2436aaa7463b82eb5ed760f
 F src/shell.c c1206a23d9239f8f51751d3be9b8c3b02fa4103546bea1add7f864d84a8276ab
 F src/shell.c.in bb9720a8c5c98d3984b16ab7540e7142bcae959666ecf248bfc523a1d44220ee
 F src/sqlite.h.in ab4f8a29d1580dfaeb6891fa1b83cff8229ba0daa56994707ceaca71495d9ab7
@@ -1655,7 +1655,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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+P 5bf2ccb908dc6ebf7e063014b0a4bed7e3e9e0a555f78c6b4f6647adfb7209e4
+R eefaca2ea58aad260c29aab3ab787ea1
 U drh
-Z edd3956faff3d872b10136acafe045b5
+Z 1bd2e271ce965a5407b85612faa9a389

manifest.uuid

@@ -1 +1 @@
-5bf2ccb908dc6ebf7e063014b0a4bed7e3e9e0a555f78c6b4f6647adfb7209e4
+3a4ffb21d0ee2326c31b9ddc512d79d4ebf3a249a2840e88e99165978eec31fd

src/select.c

@@ -4645,7 +4645,7 @@ static void sqlite3SelectExpand(Parse *pParse, Select *pSelect){
   Walker w;
   w.xExprCallback = sqlite3ExprWalkNoop;
   w.pParse = pParse;
-  if( pParse->hasCompound ){
+  if( OK_IF_ALWAYS_TRUE(pParse->hasCompound) ){
     w.xSelectCallback = convertCompoundSelectToSubquery;
     w.xSelectCallback2 = 0;
     sqlite3WalkSelect(&w, pSelect);