Small simplification to the query flattener logic.

FossilOrigin-Name: cbfe3f0c84eecef4308e1904cce4fe013ee1986ab6c85e82f92736fc80c0a358

diff --cc manifest
index 70fdddadfc8216d2bfdd4580507079b3fb23ce92,084f2b2f1778ad73f020d0b631031ddbeee6f812..6562db4cff8f0bbf33af04a97adb3078fdc56cfa
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\scksumvfs\stest\scase\sadded\sby\s[e3bd1feccaee8ff2]\sso\sthat\sit\sworks\nwith\svarying\spage\ssizes.\s\sTest\scase\schange\sonly\s-\sno\schanges\sto\scode.
- D 2025-08-23T11:09:53.644
 -C Experimental\sminor\ssimplification\sof\sthe\squery\sflattener.
 -D 2025-08-22T16:34:55.559
++C Small\ssimplification\sto\sthe\squery\sflattener\slogic.
++D 2025-08-23T18:18:03.949
  F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@@ -741,7 -741,7 +741,7 @@@ F src/printf.c 5f0c957af9699e849d786e8f
  F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
  F src/resolve.c f8d1d011aba0964ff1bdccd049d4d2c2fec217efd90d202a4bb775e926b2c25d
  F src/rowset.c 8432130e6c344b3401a8874c3cb49fefe6873fec593294de077afea2dce5ec97
- F src/select.c 5cf61d7633a0f94772f8b06484f23745d7dcd58ef8eabe944d0cc4c8bd06d235
 -F src/select.c 68b8a11c81ddf1e74f85350d4766c3ac454be22bbf9df8b06293328e47760809
++F src/select.c 62855ca3335dfb1fec366b5b646a9e98bd920aa4d6499698d74520cec08986a6
  F src/shell.c.in 0636915df0dbac6c780f04959f5d1055f206fb281b2c8fc8b113fe7bfc7d44ef
  F src/sqlite.h.in ebfc0358de0e18aabee7fa918f2f846894e23bebc74160fbe265c99046ee61b8
  F src/sqlite3.rc 015537e6ac1eec6c7050e17b616c2ffe6f70fca241835a84a4f0d5937383c479
@@@ -2169,8 -2169,11 +2169,9 @@@ F tool/version-info.c 3b36468a90faf1bbd
  F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
  F tool/warnings.sh 1ad0169b022b280bcaaf94a7fa231591be96b514230ab5c98fbf15cd7df842dd
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P a4107c947c03ed48de3ab3f516cec8a3c092cec8ee19145fb564152e5cd16c85
- R 7bb8ae11370c4eb3328c3ab20cdb528a
 -P 9ada44eb6d26532e45cdd2ed8d5707f1734d0177a13b493ff9cf070e0a992522
 -R 18f04a3f1190add04a7dcfda2fc1cbb0
 -T *branch * simplify-flattener
 -T *sym-simplify-flattener *
 -T -sym-trunk *
++P b6f8f086dacd11f57bdb0eef79f25bce209816a0748f16009372c62dc3edd5ae 953ea637d51192a6fb9c2ae84e097ae14e8a9c7fa7c98db90a39819b5f97f60e
++R 28e8a355765b7de9dedf350dc172fb64
++T +closed 953ea637d51192a6fb9c2ae84e097ae14e8a9c7fa7c98db90a39819b5f97f60e
  U drh
- Z 51b73666e6bb82bd74288a44304c3efe
 -Z 80d8e3061b1db9479a1cf58c856482da
++Z d899009af7c6cd5eeaf562d9512dda24
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 27eab5541b2ce6ee3e0868a6868def3073334183,3f16570aaa5f1f11f407ec7eadd21bee1dce3366..3cd7a4ab755fa671046cbfc580af20b05aaf9f19
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- b6f8f086dacd11f57bdb0eef79f25bce209816a0748f16009372c62dc3edd5ae
 -953ea637d51192a6fb9c2ae84e097ae14e8a9c7fa7c98db90a39819b5f97f60e
++cbfe3f0c84eecef4308e1904cce4fe013ee1986ab6c85e82f92736fc80c0a358

diff --cc src/select.c
Simple merge