Attempt to speed up sqlite3VdbeRecordCompare() by various means. This code is in an interim state.

FossilOrigin-Name: 85206e0bbac29adab52bef795f6d1479f2ae2c0e

src/sqliteInt.h

@@ -1590,15 +1590,10 @@ struct KeyInfo {
 struct UnpackedRecord {
   KeyInfo *pKeyInfo;  /* Collation and sort-order information */
   u16 nField;         /* Number of entries in apMem[] */
-  u8 flags;           /* Boolean settings.  UNPACKED_... below */
+  char default_rc;    /* Comparison result if keys are equal */
   Mem *aMem;          /* Values */
 };
 
-/*
-** Allowed values of UnpackedRecord.flags
-*/
-#define UNPACKED_INCRKEY       0x01  /* Make this key an epsilon larger */
-#define UNPACKED_PREFIX_MATCH  0x02  /* A prefix match is considered OK */
 
 /*
 ** Each SQL index is represented in memory by an