Infrastructure for the DISTINCT keyword in aggregate functions. But it does

not work yet.  If you try to use it you get an error message. (CVS 2680)

FossilOrigin-Name: 4d62e36fe3819c2a1412737c2ec8a91ddc5e1777

manifest

@@ -1,5 +1,5 @@
-C Defend\sagainst\sdisk\sI/O\serrors\sthat\shappen\sduring\san\ssqlite3OsSeek().\s(CVS\s2679)
-D 2005-09-09T01:32:06
+C Infrastructure\sfor\sthe\sDISTINCT\skeyword\sin\saggregate\sfunctions.\s\sBut\sit\sdoes\nnot\swork\syet.\s\sIf\syou\stry\sto\suse\sit\syou\sget\san\serror\smessage.\s(CVS\s2680)
+D 2005-09-09T01:33:19
 F Makefile.in 12784cdce5ffc8dfb707300c34e4f1eb3b8a14f1
 F Makefile.linux-gcc 06be33b2a9ad4f005a5f42b22c4a19dab3cbb5c7
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -40,7 +40,7 @@ F src/complete.c 4de937dfdd4c79a501772ab2035b26082f337a79
 F src/date.c 7444b0900a28da77e57e3337a636873cff0ae940
 F src/delete.c 16a0e19460b14d219f39ff5c7a9eef808aa1969c
 F src/experimental.c 50c1e3b34f752f4ac10c36f287db095c2b61766d
-F src/expr.c 38f1e135aa80dfc62e253c1e22dd6e194efd2d61
+F src/expr.c 208f8258d5f56c8da7be3e21cce4d3c34ff3e45c
 F src/func.c f63d417248808ff2632a3b576536abffcc21d858
 F src/hash.c 2b1b13f7400e179631c83a1be0c664608c8f021f
 F src/hash.h 1b0c445e1c89ff2aaad9b4605ba61375af001e84
@@ -58,7 +58,7 @@ F src/os_win.c 5771f4b7d20b03b26ae332404cc58c088ef1b010
 F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
 F src/pager.c 2b48db1cc6073a6d2577100866db6ae039d20940
 F src/pager.h 17b13225abd93c1e9f470060f40a21b9edb5a164
-F src/parse.y 4c0cf6b0646166b232693249b89e32a75c6f87d7
+F src/parse.y 13c3d16e999184cb5fba39e44f133cdf01288e3e
 F src/pragma.c 69413fbdc0c6aaa493a776ea52c1b3e6cf35dfb2
 F src/prepare.c 86f0d8e744b8d956eff6bc40e29049efee017610
 F src/printf.c c01e9ad473d79463fb1f483b1eca5c3cbed2a4e5
@@ -66,7 +66,7 @@ F src/random.c 90adff4e73a3b249eb4f1fc2a6ff9cf78c7233a4
 F src/select.c 2bba89bb64cd41991e5843617e2851c29661638d
 F src/shell.c b21daba017b8feef2fdc65ecde57f70209494217
 F src/sqlite.h.in 461b2535550cf77aedfd44385da11ef7d63e57a2
-F src/sqliteInt.h b72e8dfa8c3beb329e8c488384572c127f228f1c
+F src/sqliteInt.h f5d20d26b71a3a3e7672c1363545df2015647361
 F src/table.c 25b3ff2b39b7d87e8d4a5da0713d68dfc06cbee9
 F src/tclsqlite.c ac94682f9e601dd373912c46414a5a842db2089a
 F src/test1.c b569b60e35f0e3ea20e5ebfaf6e522a01c08d481
@@ -306,7 +306,7 @@ F www/tclsqlite.tcl 3df553505b6efcad08f91e9b975deb2e6c9bb955
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl a99cf5f6d8bd4d5537584a2b342f0fb9fa601d8b
 F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
-P 6281859425d39c11d82875301fefafad1f08416d
-R b07aee02e83584082249023aa692499c
+P 461e3a0a27ff083b0bae10c9880e3b41bb85ee31
+R e9d330cbdb5258f307f8eacbc6e8d07f
 U drh
-Z 11dbc78d82810ff4ae0a68e460fdaf1a
+Z f4c62c7887509e5c752378d8e7e6ab95