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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:Another micro-optimization in accessPayload(). Slightly smaller and faster.
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SHA1: c012619b65d70b4ef6cf33532ef57d7f8ba42d74
User & Date: drh 2017-01-27 01:25:00
Context
2017-01-27
01:52
In the command-line shell, enhance the ".mode" command so that it restores the default column and row separators for modes "line", "list", "column", and "tcl". check-in: 58f02e6e user: drh tags: trunk
01:25
Another micro-optimization in accessPayload(). Slightly smaller and faster. check-in: c012619b user: drh tags: trunk
01:13
Performance optimization in accessPayload(). check-in: ebb1fd98 user: drh tags: trunk
Changes
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Changes to src/btree.c.

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            nextPage = get4byte(aPayload);
            rc = copyPayload(&aPayload[offset+4], pBuf, a, eOp, pDbPage);
            sqlite3PagerUnref(pDbPage);
            offset = 0;
          }
        }
        amt -= a;

        pBuf += a;
      }
      if( amt==0 ) break;
      if( rc ) break;
      iIdx++;
    }
  }

  if( rc==SQLITE_OK && amt>0 ){
    return SQLITE_CORRUPT_BKPT;
  }
  return rc;
}

/*
** Read part of the payload for the row at which that cursor pCur is currently
** pointing.  "amt" bytes will be transferred into pBuf[].  The transfer







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            nextPage = get4byte(aPayload);
            rc = copyPayload(&aPayload[offset+4], pBuf, a, eOp, pDbPage);
            sqlite3PagerUnref(pDbPage);
            offset = 0;
          }
        }
        amt -= a;
        if( amt==0 ) return rc;
        pBuf += a;
      }

      if( rc ) break;
      iIdx++;
    }
  }

  if( rc==SQLITE_OK && amt>0 ){
    return SQLITE_CORRUPT_BKPT; /* Overflow chain ends prematurely */
  }
  return rc;
}

/*
** Read part of the payload for the row at which that cursor pCur is currently
** pointing.  "amt" bytes will be transferred into pBuf[].  The transfer