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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:Smaller and faster vdbeSorterCompareText().
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SHA3-256: 542dc4c5eb87017fe03b6c181e779993aa84564785e1177ccf937d52f985593b
User & Date: drh 2017-05-27 22:42:36
Context
2017-05-29
03:48
Improve shell help text for the '.open' command. check-in: 7cc940a9 user: mistachkin tags: trunk
2017-05-27
22:42
Smaller and faster vdbeSorterCompareText(). check-in: 542dc4c5 user: drh tags: trunk
2017-05-25
21:35
Small performance increase and size decrease in the btreeInitPage() routine. check-in: 6f415833 user: drh tags: trunk
Changes
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Changes to src/vdbesort.c.

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  const u8 * const v1 = &p1[ p1[0] ];   /* Pointer to value 1 */
  const u8 * const v2 = &p2[ p2[0] ];   /* Pointer to value 2 */

  int n1;
  int n2;
  int res;

  getVarint32(&p1[1], n1); n1 = (n1 - 13) / 2;
  getVarint32(&p2[1], n2); n2 = (n2 - 13) / 2;
  res = memcmp(v1, v2, MIN(n1, n2));
  if( res==0 ){
    res = n1 - n2;
  }

  if( res==0 ){
    if( pTask->pSorter->pKeyInfo->nField>1 ){
      res = vdbeSorterCompareTail(







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  const u8 * const v1 = &p1[ p1[0] ];   /* Pointer to value 1 */
  const u8 * const v2 = &p2[ p2[0] ];   /* Pointer to value 2 */

  int n1;
  int n2;
  int res;

  getVarint32(&p1[1], n1);
  getVarint32(&p2[1], n2);
  res = memcmp(v1, v2, (MIN(n1, n2) - 13)/2);
  if( res==0 ){
    res = n1 - n2;
  }

  if( res==0 ){
    if( pTask->pSorter->pKeyInfo->nField>1 ){
      res = vdbeSorterCompareTail(