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For UPDATE and DELETE, use OP_DeferredSeek always. If the seek must later

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be resolved, add the OP_FinishSeek opcode after all WHERE clause terms have
been processed.  This obviates the need for the WHERE_SEEK_TABLE and
WHERE_SEEK_UNIQ_TABLE flags to sqlite3WhereBegin() and the ensuing
complication, and it allows the covering index optimization to be used
further into WHERE clause processing.

FossilOrigin-Name: a495f60d315e34b1a1bc5fb1336e05047add52c8fb2710b577c97b10a5e734f6
This commit is contained in:
drh
2020-08-14 20:04:26 +00:00
parent 5e6d90fe15
commit 68c0c71065
6 changed files with 23 additions and 38 deletions
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4
src/sqliteInt.h
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@@ -2953,9 +2953,9 @@ struct SrcList {
#define WHERE_DISTINCTBY 0x0080 /* pOrderby is really a DISTINCT clause */
#define WHERE_WANT_DISTINCT 0x0100 /* All output needs to be distinct */
#define WHERE_SORTBYGROUP 0x0200 /* Support sqlite3WhereIsSorted() */
#define WHERE_SEEK_TABLE 0x0400 /* Do not defer seeks on main table */
/* 0x0400 not currently used */
#define WHERE_ORDERBY_LIMIT 0x0800 /* ORDERBY+LIMIT on the inner loop */
#define WHERE_SEEK_UNIQ_TABLE 0x1000 /* Do not defer seeks if unique */
/* 0x1000 not currently used */
/* 0x2000 not currently used */
#define WHERE_USE_LIMIT 0x4000 /* Use the LIMIT in cost estimates */
/* 0x8000 not currently used */