The IN-early-out optimization: When doing a look-up on a multi-column index

and an IN operator is used on a column other than the left-most column, then
if no rows match against the first IN value, check to make sure there exist
rows that match the columns to the right before continuing with the next IN
value.

FossilOrigin-Name: 09fffbdf9f2f6ce31a22d5a6df7a45f19a16628da622f12d6e33171cce09fb21

diff --cc manifest
index ae7fdac9376cfb54fab9b77a7828fdfd45e00b3f,660acafd9adb42f9d912f1e6776656592187bfad..f31ac5a47bb76cee1046065b6dce4795b76c9923
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Avoid\susing\sa\sprepared\sstatement\sfor\s".stats\son"\safter\sit\shas\sbeen\sclosed\nby\sthe\s".eqp\sfull"\slogic.\s\sFix\sfor\sticket\s[7be932dfa60a8a6b3b26bcf76].
- D 2018-06-07T15:23:43.571
 -C Fix\sthe\sassert()s\sin\sthe\sbyte-code\sengine\sthat\sprove\sthat\scursors\nare\sunidirectional.
 -D 2018-06-07T18:01:21.263
++C The\sIN-early-out\soptimization:\s\sWhen\sdoing\sa\slook-up\son\sa\smulti-column\sindex\nand\san\sIN\soperator\sis\sused\son\sa\scolumn\sother\sthan\sthe\sleft-most\scolumn,\sthen\nif\sno\srows\smatch\sagainst\sthe\sfirst\sIN\svalue,\scheck\sto\smake\ssure\sthere\sexist\nrows\sthat\smatch\sthe\scolumns\sto\sthe\sright\sbefore\scontinuing\swith\sthe\snext\sIN\nvalue.
++D 2018-06-07T18:13:49.091
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F Makefile.in bfc40f350586923e0419d2ea4b559c37ec10ee4b6e210e08c14401f8e340f0da
@@@ -1730,7 -1731,7 +1731,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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+ R fe7d026f8be3134e2723fc39eeec5ed5
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  U drh
- Z 107f8808affc9ffe8154c296896c4113
 -Z 8c642b57392b756fd19e94b953870085
++Z 8a623af2a2288d1935dd9b3507daa5d8

diff --cc manifest.uuid
index c4bf873456af5c8361430382ef46c57cf997d546,9c15183170e832e99d7a465b642c0ffee3e64667..9bc93f1fe039621cf3bf7daf6beadc94e8277033
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- bb87c054b1b76959e46258ac66b24027f468b390a4148ac67f208a1fbeda4060
 -4b0b4e14039469b656662312a5f80f086ede293e9ad04c7bc99a202b683a1e55
++09fffbdf9f2f6ce31a22d5a6df7a45f19a16628da622f12d6e33171cce09fb21