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Comment changes that attempt to better explain the behavior of the "seekResult"

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field on VdbeCursor objects and the seekResult parameter to
sqlite3BtreeInsert() and the OPFLAG_USESEEKRESULT flag on insert opcodes.
No changes to code.

FossilOrigin-Name: 345b46be75bdf6f9fb7367a6164d89bae11995a6
This commit is contained in:
drh
2016-11-09 20:14:34 +00:00
parent 7405fa745e
commit eaf6ae2992
5 changed files with 34 additions and 32 deletions
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5
src/vdbeInt.h
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@@ -96,7 +96,10 @@ struct VdbeCursor {
} uc;
Btree *pBt; /* Separate file holding temporary table */
KeyInfo *pKeyInfo; /* Info about index keys needed by index cursors */
int seekResult; /* Result of previous sqlite3BtreeMoveto() */
int seekResult; /* Result of previous sqlite3BtreeMoveto() or 0
** if there have been no prior seeks on the cursor. */
/* NB: seekResult does not distinguish between "no seeks have ever occurred
** on this cursor" and "the most recent seek was an exact match". */
i64 seqCount; /* Sequence counter */
i64 movetoTarget; /* Argument to the deferred sqlite3BtreeMoveto() */
VdbeCursor *pAltCursor; /* Associated index cursor from which to read */