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Comment tweaks in where.c. No changes to code.

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FossilOrigin-Name: cecc5fdd5d8fbad7d9e8c275b9ba9ade3dbee8ef
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drh
2013-06-14 13:27:01 +00:00
parent b8916be945
commit f003076032
3 changed files with 12 additions and 14 deletions
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12
src/where.c
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@@ -65,7 +65,7 @@ typedef struct WhereScan WhereScan;
typedef unsigned short int WhereCost;
/*
** This object contains information needed to implement a single nestd
** This object contains information needed to implement a single nested
** loop in WHERE clause.
**
** Contrast this object with WhereLoop. This object describes the
@@ -5944,12 +5944,10 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
}
}
/* If this scan uses an index, make code substitutions to read data
** from the index in preference to the table. Sometimes, this means
** the table need never be read from. This is a performance boost,
** as the vdbe level waits until the table is read before actually
** seeking the table cursor to the record corresponding to the current
** position in the index.
/* If this scan uses an index, make VDBE code substitutions to read data
** from the index instead of from the table where possible. In some cases
** this optimization prevents the table from ever being read, which can
** yield a significant performance boost.
**
** Calls to the code generator in between sqlite3WhereBegin and
** sqlite3WhereEnd will have created code that references the table