Rename SQLITE_FUNC_VARYING to SQLITE_FUNC_SLOCHNG - a more descriptive name

for what that bit means.

FossilOrigin-Name: ff5137a6dd8cb2a9b629b3a244f52665e9c9ebce

manifest

@@ -1,5 +1,5 @@
-C Remove\sunreachable\sbranches.
-D 2015-09-01T00:42:52.453
+C Rename\sSQLITE_FUNC_VARYING\sto\sSQLITE_FUNC_SLOCHNG\s-\sa\smore\sdescriptive\sname\nfor\swhat\sthat\sbit\smeans.
+D 2015-09-01T13:17:17.375
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in f85066ce844a28b671aaeeff320921cd0ce36239
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -335,14 +335,14 @@ F src/pragma.h 631a91c8b0e6ca8f051a1d8a4a0da4150e04620a
 F src/prepare.c 82e5db1013846a819f198336fed72c44c974e7b1
 F src/printf.c 2bc439ff20a4aad0e0ad50a37a67b5eae7d20edc
 F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
-F src/resolve.c 203146a9adfed08c94cdb4bd59421b066a00e03f
+F src/resolve.c 47c00ca0ab24d4b8113c6c05aa07bc6cf6eac9af
 F src/rowset.c eccf6af6d620aaa4579bd3b72c1b6395d9e9fa1e
 F src/select.c b52c80f2b1bdb62491f9ce40eea0c5f80c78d105
 F src/shell.c 6332ef06db1390ef812cfdff1fc97b4fd76cdd42
 F src/sqlite.h.in 378bebc8fe6a88bade25e5f23b7e6123fdc64b00
 F src/sqlite3.rc 992c9f5fb8285ae285d6be28240a7e8d3a7f2bad
 F src/sqlite3ext.h f700e6a9dd1fdcccc9951ab022b366fb66b9e413
-F src/sqliteInt.h fde5d96c3d547084f7c9ba85b87bad3e4a9a613f
+F src/sqliteInt.h e7e92112a71aeb214c66ebdea1366560535614d1
 F src/sqliteLimit.h 216557999cb45f2e3578ed53ebefe228d779cb46
 F src/status.c f266ad8a2892d659b74f0f50cb6a88b6e7c12179
 F src/table.c 51b46b2a62d1b3a959633d593b89bab5e2c9155e
@@ -1381,7 +1381,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 5a2c0e90a1933545b4768d91d8f7c42c8f391019
-R 43c7fa01f20234523219b9eb18641ef8
+P fd4da2318cc032d7c355376e440d4a05d7ab8793
+R 56bc6d7502c6fcf5fea0759746df8b8f
 U drh
-Z e43aaed9b864f00cd6aff5655ab5ae6d
+Z 5fd0e1fb2f0e68b5cb95600541b3c11a

manifest.uuid

@@ -1 +1 @@
-fd4da2318cc032d7c355376e440d4a05d7ab8793
+ff5137a6dd8cb2a9b629b3a244f52665e9c9ebce

src/resolve.c

@@ -729,15 +729,16 @@ static int resolveExprStep(Walker *pWalker, Expr *pExpr){
           return WRC_Prune;
         }
 #endif
-        if( pDef->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_VARYING) ){
+        if( pDef->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_SLOCHNG) ){
           /* For the purposes of the EP_ConstFunc flag, date and time
           ** functions and other functions that change slowly are considered
           ** constant because they are constant for the duration of one query */
           ExprSetProperty(pExpr,EP_ConstFunc);
         }
         if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){
-          /* DATETIME functions are considered non-deterministic because of
-          ** the 'now' capability */
+          /* Date/time functions that use 'now', and other functions like
+          ** sqlite_version() that might change over time cannot be used
+          ** in an index. */
           notValid(pParse, pNC, "non-deterministic functions", NC_IdxExpr);
         }
       }

src/sqliteInt.h

@@ -1396,7 +1396,8 @@ struct FuncDestructor {
 #define SQLITE_FUNC_UNLIKELY 0x0400 /* Built-in unlikely() function */
 #define SQLITE_FUNC_CONSTANT 0x0800 /* Constant inputs give a constant output */
 #define SQLITE_FUNC_MINMAX   0x1000 /* True for min() and max() aggregates */
-#define SQLITE_FUNC_VARYING  0x2000 /* Function that change in the long term */
+#define SQLITE_FUNC_SLOCHNG  0x2000 /* "Slow Change". Value constant during a
+                                    ** single query - might change over time */
 
 /*
 ** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
@@ -1414,7 +1415,7 @@ struct FuncDestructor {
 **
 **   DFUNCTION(zName, nArg, iArg, bNC, xFunc)
 **     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag and
-**     adds the SQLITE_FUNC_VARYING flag.  Used for date & time functions
+**     adds the SQLITE_FUNC_SLOCHNG flag.  Used for date & time functions
 **     and functions like sqlite_version() that can change, but not during
 **     a single query.
 **
@@ -1439,13 +1440,13 @@ struct FuncDestructor {
   {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
    SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
 #define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
-  {nArg, SQLITE_FUNC_VARYING|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
+  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
    SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
 #define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
   {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
    SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0, 0}
 #define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
-  {nArg, SQLITE_FUNC_VARYING|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
+  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
    pArg, 0, xFunc, 0, 0, #zName, 0, 0}
 #define LIKEFUNC(zName, nArg, arg, flags) \
   {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
@@ -2131,7 +2132,7 @@ struct Expr {
 #define EP_MemToken  0x010000 /* Need to sqlite3DbFree() Expr.zToken */
 #define EP_NoReduce  0x020000 /* Cannot EXPRDUP_REDUCE this Expr */
 #define EP_Unlikely  0x040000 /* unlikely() or likelihood() function */
-#define EP_ConstFunc 0x080000 /* A SQLITE_FUNC_CONSTANT or _VARYING function */
+#define EP_ConstFunc 0x080000 /* A SQLITE_FUNC_CONSTANT or _SLOCHNG function */
 #define EP_CanBeNull 0x100000 /* Can be null despite NOT NULL constraint */
 #define EP_Subquery  0x200000 /* Tree contains a TK_SELECT operator */