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Overview
Comment:Very small performance increase in sqlite3VdbeSetNumCols().
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SHA3-256: 8885b4461044ae8ecdfe1b9aa47f4aad65efabc98e3fcd9e307a06504fab34c6
User & Date: drh 2017-05-31 11:24:13.659
Context
2017-05-31
13:27
Remove a completely unnecessary memset() from the INSERT code generator. (check-in: 7d58836b9d user: drh tags: trunk)
11:24
Very small performance increase in sqlite3VdbeSetNumCols(). (check-in: 8885b44610 user: drh tags: trunk)
03:20
Reorder fields in the PgHdr object for a performance increase. (check-in: 326e63d71e user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/vdbeaux.c.
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/*
** Set the number of result columns that will be returned by this SQL
** statement. This is now set at compile time, rather than during
** execution of the vdbe program so that sqlite3_column_count() can
** be called on an SQL statement before sqlite3_step().
*/
void sqlite3VdbeSetNumCols(Vdbe *p, int nResColumn){
  Mem *pColName;
  int n;
  sqlite3 *db = p->db;


  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
  sqlite3DbFree(db, p->aColName);

  n = nResColumn*COLNAME_N;
  p->nResColumn = (u16)nResColumn;
  p->aColName = pColName = (Mem*)sqlite3DbMallocRawNN(db, sizeof(Mem)*n );
  if( p->aColName==0 ) return;
  initMemArray(p->aColName, n, p->db, MEM_Null);
}

/*
** Set the name of the idx'th column to be returned by the SQL statement.
** zName must be a pointer to a nul terminated string.
**
** This call must be made after a call to sqlite3VdbeSetNumCols().








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2156
2157
2158
2159
2160
2161
2162

2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181

/*
** Set the number of result columns that will be returned by this SQL
** statement. This is now set at compile time, rather than during
** execution of the vdbe program so that sqlite3_column_count() can
** be called on an SQL statement before sqlite3_step().
*/
void sqlite3VdbeSetNumCols(Vdbe *p, int nResColumn){

  int n;
  sqlite3 *db = p->db;

  if( p->nResColumn ){
    releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
    sqlite3DbFree(db, p->aColName);
  }
  n = nResColumn*COLNAME_N;
  p->nResColumn = (u16)nResColumn;
  p->aColName = (Mem*)sqlite3DbMallocRawNN(db, sizeof(Mem)*n );
  if( p->aColName==0 ) return;
  initMemArray(p->aColName, n, db, MEM_Null);
}

/*
** Set the name of the idx'th column to be returned by the SQL statement.
** zName must be a pointer to a nul terminated string.
**
** This call must be made after a call to sqlite3VdbeSetNumCols().
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