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Performance: use first 1000 rows only for calculating the CSV export size, and interpolate the rest. Closes #804

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This commit is contained in:
Ansgar Becker
2020-01-21 20:39:38 +01:00
parent 4497cb2d91
commit feeb17e7d4
1 changed files with 9 additions and 1 deletions
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10
source/exportgrid.pas
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@ -413,7 +413,7 @@ var
Node: PVirtualNode;
Col, ExcludeCol: TColumnIndex;
RowNum: PInt64;
SelectionSize, AllSize: Int64;
SelectionSize, AllSize, RowsCalculated: Int64;
begin
GridData := Mainform.GridResult(Grid);
AllSize := 0;
@ -424,6 +424,7 @@ begin
ExcludeCol := GridData.AutoIncrementColumn;
Node := GetNextNode(Grid, nil, False);
RowsCalculated := 0;
while Assigned(Node) do begin
RowNum := Grid.GetNodeData(Node);
GridData.RecNo := RowNum^;
@ -436,8 +437,15 @@ begin
end;
Col := Grid.Header.Columns.GetNextVisibleColumn(Col);
end;
// Performance: use first rows only, and interpolate the rest, see issue #804
Inc(RowsCalculated);
if RowsCalculated >= 1000 then
Break;
Node := GetNextNode(Grid, Node, False);
end;
if GridData.RecordCount > RowsCalculated then begin
AllSize := Round(AllSize / RowsCalculated * GridData.RecordCount);
end;
grpSelection.Items[0] := f_('Selection (%s rows, %s)', [FormatNumber(Grid.SelectedCount), FormatByteNumber(SelectionSize)]);
grpSelection.Items[1] := f_('Complete (%s rows, %s)', [FormatNumber(Grid.RootNodeCount), FormatByteNumber(AllSize)]);
end;