Merge the latest trunk enhancements into the begin-concurrent-pnu-wal2 branch.

FossilOrigin-Name: 1336d2f23fcee5bc969cd5ca9e3be1458915e79365e21566ca2ba438f6df260b

diff --cc manifest
index 6d64325b77329dc47e9b5320286b6260564f6f58,6b26e5ac0129af1f19a2c32503d3f354f0f7ab45..7f523bfb226d258a3a29e248a293fd997d379e96
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Merge\srecent\strunk\schanges\sinto\sthe\sbegin-concurrent-pnu-wal2\sbranch.
- D 2022-02-04T18:02:39.279
 -C Merge\srecent\strunk\senhancements\sinto\sthe\swal2\sbranch.
 -D 2022-02-15T20:37:36.975
++C Merge\sthe\slatest\strunk\senhancements\sinto\sthe\sbegin-concurrent-pnu-wal2\sbranch.
++D 2022-02-15T20:47:54.960
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -497,12 -492,12 +497,12 @@@ F src/analyze.c 7518b99e07c5494111fe3bd
  F src/attach.c f26d400f3ffe2cdca01406bca70e5f58c5488bf165b4fc37c228136dfcf1b583
  F src/auth.c f4fa91b6a90bbc8e0d0f738aa284551739c9543a367071f55574681e0f24f8cf
  F src/backup.c a2891172438e385fdbe97c11c9745676bec54f518d4447090af97189fd8e52d7
 -F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d
 +F src/bitvec.c 3907fcbe8a0c8c2db58d97087d15cdabbf2842adb9125df9ab9ff87d3db16775
  F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
- F src/btree.c a7f304a0c872b6d1f1fc162123b5b0a43dd1874b30ecdf26a77956f2e3e12c7f
 -F src/btree.c f7a4f869f4414ebbd72abf257a461cc89d41c6a885fccdc807051d99f52ec981
 -F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22
 -F src/btreeInt.h ee9348c4cb9077243b049edc93a82c1f32ca48baeabf2140d41362b9f9139ff7
 -F src/build.c b59ff41525c10b429adc277d3bca6e433b09d055b0df8c1529385763cea8bb04
++F src/btree.c 0b782485675f2d7923a11ea1354f708940c6edf2069aef3a3477df869263cde9
 +F src/btree.h 900067641b64d619e6e2a93bd115c952a52f41d3bee32e551e2a4ceee05fc431
 +F src/btreeInt.h 3f19f0be5af0b68cff55e58df4b11e7a0692d9e8a820ceaeba4084659a86cf28
- F src/build.c 38cffd6b81ecdd464c73a75d0b8bd9f71d769bbb6279b2f8dc8de05dc3d712f2
++F src/build.c 40098e1bdd51c674f01a2e4210f593bd4c4aa6ce419388f9a790fd73e426261c
  F src/callback.c 4c19af69835787bfe790ac560f3071a824eb629f34e41f97b52ce5235c77de1c
  F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
  F src/ctime.c 2cce39df1a13e05b7633e6d21b651f21492471f991dd7b323a4ee4e7b7f0b7f1
@@@ -510,11 -505,11 +510,11 @@@ F src/date.c 1fcc64294b0e81cc9fa05cf8f7
  F src/dbpage.c 8a01e865bf8bc6d7b1844b4314443a6436c07c3efe1d488ed89e81719047833a
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- F src/expr.c 31d23e6b57827b4cb8f0054f44e2ed86feb1dfcaa9b0c4d6c960b42536a17ca0
+ F src/expr.c b90a029105a93a93a0ed5e5f8c5eaed8f19043a3b62e4c4d235a4611d9ada178
  F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
  F src/fkey.c 06e4ac33031b02dde7130c12e79cddf4dc5cfa72b23d8e63a3c26878fc9c1d3c
- F src/func.c 1c25ea71ccfa323e713306755d8d757404c93b8291867ec3a93550fcae23aa51
- F src/global.c 1f56aead86e8a18c4415638f5e6c4d0a0550427f4b3f5d065ba5164cc09c22e8
 -F src/func.c f801c6bc8b30afea51817d86a6c46259d3cca180c612cfa0a30b18d661e9c8df
++F src/func.c 64e37fded60afe8af2ccea05ab7217dfee55100c0b0a9d777ba34111c0c5b6eb
+ F src/global.c a3daa18a1696aadd94f18d37cbbdebf0bbdb827b8397a534f021cd56c15cd0f9
  F src/hash.c 8d7dda241d0ebdafb6ffdeda3149a412d7df75102cecfc1021c98d6219823b19
  F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
  F src/hwtime.h cb1d7e3e1ed94b7aa6fde95ae2c2daccc3df826be26fc9ed7fd90d1750ae6144
@@@ -523,7 -518,7 +523,7 @@@ F src/insert.c 1eea44389de3768ac98588c1
  F src/json.c 225b00422112ecd7094a555f3ace16b25d7d5894062b823269ed03899907c2a2
  F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
  F src/loadext.c aa919a6a7884f8b34d7b791841b24d14b1b0ab43f45b3940f4851043b2855c0c
- F src/main.c 4806307e415189bbf91df6467d6ff923643fdeb84e782ef0d5451a14465db935
 -F src/main.c 0840cee6984034c7e73cc747a1562c7eaed4673694bf20b00980aaa0672c0405
++F src/main.c 4fa5379ff5981bc1e35bc988dc908e5bb9b84f820cd7eebae88ce6ae8617b624
  F src/malloc.c fec841aa0a0400a6f7d20706178a5d8e8219a6bf562b6fe712c17f6c26813266
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  F src/mem1.c c12a42539b1ba105e3707d0e628ad70e611040d8f5e38cf942cee30c867083de
@@@ -543,33 -538,33 +543,33 @@@ F src/os.c b1c4f2d485961e9a5b6b648c3668
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 -F src/os_unix.c f5ad51cfd024116db8531feab9efd831c2621436dca1464e4ff1e8af9bf3252e
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  F src/os_win.c 77d39873836f1831a9b0b91894fec45ab0e9ca8e067dc8c549e1d1eca1566fe9
  F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
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++F src/pager.c 5522acd0b90e8016caa149f6eefe7653351b0b29c6933321671d045ae92d8ff2
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- F src/printf.c 975f1f5417f2526365b6e6d7f22332e3e11806dad844701d92846292b654ba9a
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++F src/select.c 9f660188fffb63b7fa5db8fcee791277a6307e43922d7765c26e8a0754b6423e
+ F src/shell.c.in b5b44c2ebfd3942e60dbcc47b94a74337a482a5f1c3766fbfb9f578a605ecf50
 -F src/sqlite.h.in 7047c4b60fa550264d6363bb1d983540e7828fb19d2d1e5aa43b52ca13144807
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  F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
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  F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
  F src/tclsqlite.c 48f291e1a7e672a7204884d4c164a8ed3a522ff087c361ada2991f5d54e987f6
- F src/test1.c 5d39b01f7ce4c0d50e1e83c574e1693de2e88036aa298bc156a03b7d388f6ca1
 -F src/test1.c 87fda59eea3ac1eba1baef37c1967565cb1b8d6d264649f2e57f252ca5989914
++F src/test1.c 85b55c1154f0568856f7c8a93c8549613595b7d861803a7dca7b056383ba2ace
  F src/test2.c 3efb99ab7f1fc8d154933e02ae1378bac9637da5
  F src/test3.c 61798bb0d38b915067a8c8e03f5a534b431181f802659a6616f9b4ff7d872644
  F src/test4.c 7c4420e01c577b5c4add2cb03119743b1a357543d347773b9e717195ea967159
@@@ -623,19 -618,19 +623,19 @@@ F src/test_windirent.h 90dfbe95442c9762
  F src/test_window.c cdae419fdcea5bad6dcd9368c685abdad6deb59e9fc8b84b153de513d394ba3f
  F src/test_wsd.c 41cadfd9d97fe8e3e4e44f61a4a8ccd6f7ca8fe9
  F src/threads.c 4ae07fa022a3dc7c5beb373cf744a85d3c5c6c3c
- F src/tokenize.c b74d878aa7c82ec8460779468061a96185e22257f68ab785b69abce354b70446
- F src/treeview.c 9dfdb7ff7f6645d0a6458dbdf4ffac041c071c4533a6db8bb6e502b979ac67bc
- F src/trigger.c 692972e4393dfc8017a1a527c1ea1b96ce3d101e84584cd832fcfb83d22b50b2
+ F src/tokenize.c 6661a9fa660ecbd3ac0df1acd2ec788b3a8122b4316022bcdaf476ea6754a8de
+ F src/treeview.c a84b57d15e46007d8b1ae249344b3f0b7f3c62def908b98baaa54935a57c8476
+ F src/trigger.c 19fc6fe696a2409b04496df1ff044e6a942dad6ed3b6e897b1c9093b88cc2c62
 -F src/update.c f875b0d59da5c3055a0b2ac20560e1650229c6787e78de5e9836267b5cbb8359
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  F src/upsert.c 8789047a8f0a601ea42fa0256d1ba3190c13746b6ba940fe2d25643a7e991937
  F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
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  F src/vdbeInt.h b45599a2b59f1ce042512ab6786b0b82a8cf3002f6b0fa60b4834e2cd3ac61d8
- F src/vdbeapi.c 06bff35393ca5daa3e02e38fb516df320bd52720a2781eb70c2db23ea1c746dd
- F src/vdbeaux.c 312d57e71e6e152243867390308aec667e05a4e7e676a674114a33f6687d3702
+ F src/vdbeapi.c 8863ffb5a7bac42fe9a68aaa3526ee29fc18fb02a9b27188b756de41e33856e9
 -F src/vdbeaux.c 0d7659fe8cb38ce86092b9bc5131c99a834a04eb78745e54acb77d79d7af2fb5
++F src/vdbeaux.c d0fed930f5c63fd49c0e0f4e576e3fa03078614497154ebeb2e7aa2cdd144802
  F src/vdbeblob.c 5e61ce31aca17db8fb60395407457a8c1c7fb471dde405e0cd675974611dcfcd
  F src/vdbemem.c eb6042667c02c3ef1f968235b4a170e31b23a4b6a57f65a8454eab4d36f14b7f
  F src/vdbesort.c 43756031ca7430f7aec3ef904824a7883c4ede783e51f280d99b9b65c0796e35
@@@ -643,13 -638,13 +643,13 @@@ F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1
  F src/vdbevtab.c f99b275366c5fc5e2d99f734729880994ab9500bdafde7fae3b02d562b9d323c
  F src/vtab.c e0eaf5b8f7f8929088485a76bea2ff6124adb12e0eb5c0997287ff5e0e4c0517
  F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 -F src/wal.c a9cc35881efbb97e568b654dffa2716cf4c5d3fd15489980ab96e48fc5bc60a7
 -F src/wal.h d01234e828943e002040c22a7e017642962f9fd9b2dc142fa599769ae4e459e9
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  F src/walker.c f890a3298418d7cba3b69b8803594fdc484ea241206a8dfa99db6dd36f8cbb3b
- F src/where.c 31bc1f43b0bf679e93c3e7a7d67cbcaddc7ae746694b149b282427d337b06caa
+ F src/where.c 0d75d7514764726409ea945520fe9fb515e7d9ae52a5a3c0a136142cfaa19087
  F src/whereInt.h 15d2975c3b4c193c78c26674400a840da8647fe1777ae3b026e2d15937b38a03
- F src/wherecode.c 4a0dd0403e1c9b628a420eefbe1d60da0003356de6ee18e6707480c9b995bae7
- F src/whereexpr.c 2da56404a024dc8dc41a31d8b498eed2c7c6b0bb412150d88cb3327516aa3b9f
+ F src/wherecode.c 6150f51c0368be941fad90a736ce37cc1e2a719876750a3183a516ed256a4cbb
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  F src/window.c dfaec4abc6012cbc18e4a202ca3a5d5a0efcc4011d86a06d882ddaab8aedee4d
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@@@ -1746,11 -1731,10 +1747,11 @@@ F test/vtab_err.test dcc8b7b9cb67522b3f
  F test/vtab_shared.test 5253bff2355a9a3f014c15337da7e177ab0ef8ad
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  F test/vtabdrop.test 65d4cf6722972e5499bdaf0c0d70ee3b8133944a4e4bc31862563f32a7edca12
- F test/vtabrhs1.test c138346be341916ecc9d918dcfc2657d27bce211a350a82b01d62d224b167b56
+ F test/vtabrhs1.test 9b5ecbc74a689500c33a4b2b36761f9bcc22fcc4e3f9d21066ee0c9c74cf5f6c
  F test/wal.test 07d61ee522bc203235a7979645d6c5d84f86882afad5b678532ee37b5b85b133
 -F test/wal2.test 31f6e2c404b9f2cdf9ca19b105a1742fdc19653c2c936da39e3658c617524046
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  F test/wal2big.test 0b4ec526f9ca4bbabc355042c38045ae2e253fb46eb327bb7693d0122bc6968b
 +F test/wal2concurrent.test 7fc3e570073683a2a28f42bda46ecf516f5bc82afd703c1fbf4aa38e18fb3361
  F test/wal2fault.test 2e8e60cacd5bcd451618aeffd05f676894d17202d3e2986e288d36e2c5993249
  F test/wal2lock.test 0ef98d72dc6bcf7711dedd684760488400d9a9a6eec0dc5d3822060437793552
  F test/wal2openclose.test 2b26be723ea7f4263c8d5d70b37efd1c359561a0526e39466c45fe8e6478daee
@@@ -1975,8 -1957,8 +1976,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 3d949775e3029c6bf7cb06946ce52e2dfab451a3f7e685d654807cb5ac750b02 d2de02f372a07b10e21f56fc49755545e7c8c889a9527bf3818e5e65cb33bb80
- R a35f8800ac59556679bc56c1dc07ba6a
 -P d2de02f372a07b10e21f56fc49755545e7c8c889a9527bf3818e5e65cb33bb80 9edaeed56f2282fd4da935454178c38ab49d259aed96d4e720aae09050a53006
 -R b0a602b2f5215e680c54c851c61eb1c4
++P cb045aba7c7f73ca4ad33f77a1ad0c3196eb4db0b2792a1bbbe079593c4f8f56 7dba818893fb898e4556bb7ed9cb0dc5667b19a3d7969c7d35c902d2bf5450b1
++R 4d6a15ecf0edc505953e6f6e67fd0db6
  U drh
- Z 4dd875bec6e8112fb20ffa75a1523aae
 -Z 92a3bf61cd054960abfabd4577b6b1d3
++Z 3505be00cc13a8dd4495e2144cb045ba
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index d15b7ce5cadc4d576be4e623dc69f8f618015c76,a5dc21e54c56a9c1f6e2bea34d70696634976103..aab57ca95e4138a2eaa0935bea292d6588a94558
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- cb045aba7c7f73ca4ad33f77a1ad0c3196eb4db0b2792a1bbbe079593c4f8f56
 -7dba818893fb898e4556bb7ed9cb0dc5667b19a3d7969c7d35c902d2bf5450b1
++1336d2f23fcee5bc969cd5ca9e3be1458915e79365e21566ca2ba438f6df260b

diff --cc src/btree.c
index ea267a2a27556c82a46bc71092d799a3c5f5a234,7c830311c46460566916758e3c91c4345fc6e245..01aec6d4d6cd5722307855aa060e0f5ce93e7456
--- 1/src/btree.c
--- 2/src/btree.c
+++ b/src/btree.c
@@@ -10084,9 -9621,8 +10090,9 @@@ static int clearDatabasePage
    }
    rc = getAndInitPage(pBt, pgno, &pPage, 0, 0);
    if( rc ) return rc;
 +  setMempageRoot(pPage, pgnoRoot);
    if( (pBt->openFlags & BTREE_SINGLE)==0 
-    && sqlite3PagerPageRefcount(pPage->pDbPage)!=1
+    && sqlite3PagerPageRefcount(pPage->pDbPage) != (1 + (pgno==1))
    ){
      rc = SQLITE_CORRUPT_BKPT;
      goto cleardatabasepage_out;

diff --cc src/build.c
Simple merge

diff --cc src/func.c
Simple merge

diff --cc src/main.c
Simple merge

diff --cc src/pager.c
Simple merge

diff --cc src/parse.y
Simple merge

diff --cc src/select.c
Simple merge

diff --cc src/sqlite.h.in
Simple merge

diff --cc src/sqliteInt.h
Simple merge

diff --cc src/test1.c
Simple merge

diff --cc src/vdbeaux.c
Simple merge