Query planner tuning: When deciding between two plans with the same cost,

bias the selection toward the one that does not use the sorter.

FossilOrigin-Name: f0ec36d479ac4efaa0efd0594d032dd7b8ccdf84a4dc3644cd688762186fbcca

manifest

@@ -1,5 +1,5 @@
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-D 2017-06-24T13:31:40.345
+C Query\splanner\stuning:\s\sWhen\sdeciding\sbetween\stwo\splans\swith\sthe\ssame\scost,\nbias\sthe\sselection\stoward\sthe\sone\sthat\sdoes\snot\suse\sthe\ssorter.
+D 2017-06-24T16:03:18.634
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 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
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@@ -486,7 +486,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
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-F src/where.c d4f329d9055dbdb475d697f205db1104af886aad4400168fb9b957f6251ea926
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 F src/whereInt.h 2a4b634d63ce488b46d4b0da8f2eaa8f9aeab202bc25ef76f007de5e3fba1f20
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 F src/whereexpr.c a2fe3811d45af45a5c6667caabc15e01054fe6228c64e86e1f7d2ba5ef5284f9
@@ -1583,7 +1583,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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manifest.uuid

@@ -1 +1 @@
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+f0ec36d479ac4efaa0efd0594d032dd7b8ccdf84a4dc3644cd688762186fbcca

src/where.c

@@ -3972,6 +3972,7 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
                rUnsorted, rCost));
         }else{
           rCost = rUnsorted;
+          rUnsorted -= 2;  /* TUNING:  Slight bias in favor of no-sort plans */
         }
 
         /* Check to see if pWLoop should be added to the set of