Improved error messages when an ALTER TABLE RENAME COLUMN fails due to a

duplicate column name.

FossilOrigin-Name: 37d11b8e8224a8b241ff57b9c4b9499db39dde4ddcb56ff8b03a3d08091a4c11

src/sqliteInt.h

@@ -3329,8 +3329,14 @@ typedef struct {
   char **pzErrMsg;    /* Error message stored here */
   int iDb;            /* 0 for main database.  1 for TEMP, 2.. for ATTACHed */
   int rc;             /* Result code stored here */
+  u32 mInitFlags;     /* Flags controlling error messages */
 } InitData;
 
+/*
+** Allowed values for mInitFlags
+*/
+#define INITFLAG_AlterTable   0x0001  /* This is a reparse after ALTER TABLE */
+
 /*
 ** Structure containing global configuration data for the SQLite library.
 **
@@ -3801,7 +3807,7 @@ void sqlite3ExprListDelete(sqlite3*, ExprList*);
 u32 sqlite3ExprListFlags(const ExprList*);
 int sqlite3Init(sqlite3*, char**);
 int sqlite3InitCallback(void*, int, char**, char**);
-int sqlite3InitOne(sqlite3*, int, char**);
+int sqlite3InitOne(sqlite3*, int, char**, u32);
 void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);
 #ifndef SQLITE_OMIT_VIRTUALTABLE
 Module *sqlite3PragmaVtabRegister(sqlite3*,const char *zName);