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Perf: EuiDataGrid don't recreate columns on every change #2676

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merged 4 commits into from
Dec 17, 2019
Merged

Perf: EuiDataGrid don't recreate columns on every change #2676

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bddba43
perf: dont recreate columns on every change
mbondyra Dec 13, 2019
4ce3bc5
Update CHANGELOG.md
mbondyra Dec 17, 2019
82f078a
revert: the big table size
mbondyra Dec 17, 2019
9aeed67
Merge branch 'master' into perf-data-grid-take-2
mbondyra Dec 17, 2019
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
**Bug fixes**

- Reverted removal of `toggleOpen` method from `EuiNavDrawer` ([#2682](https://github.com/elastic/eui/pull/2682))
- Improved `EuiDataGrid` update performance ([#2676](https://github.com/elastic/eui/pull/2676))

## [`17.2.1`](https://github.com/elastic/eui/tree/v17.2.1)

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20 changes: 14 additions & 6 deletions src/components/datagrid/column_selector.tsx
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@@ -1,6 +1,7 @@
import React, {
Fragment,
useState,
useMemo,
ReactChild,
ReactElement,
ChangeEvent,
Expand Down Expand Up @@ -199,11 +200,18 @@ export const useColumnSelector = (
</EuiPopover>
);

const orderedVisibleColumns = visibleColumns
.map<EuiDataGridColumn>(
columnId =>
availableColumns.find(({ id }) => id === columnId) as EuiDataGridColumn // cast to avoid `undefined`, it filters those out next
)
.filter(column => column != null);
const orderedVisibleColumns = useMemo(
() =>
visibleColumns
.map<EuiDataGridColumn>(
columnId =>
availableColumns.find(
({ id }) => id === columnId
) as EuiDataGridColumn // cast to avoid `undefined`, it filters those out next
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Why not filter first?

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@mbondyra mbondyra Dec 17, 2019 •
edited
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I think (although I am not sure, I just wrapped it with useMemo but that's how I understand the comment) that the find returns nulls in case it won't find the id === columnId and after that we're getting rid of the nulls with filter 🤔

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Indeed, this looks like whitespace-only changes with the additional useMemo wrapping. I set originally set it up to filter second. No real reason, didn't occur to me to filter first 🤷‍♀

)
.filter(column => column != null),
[availableColumns, visibleColumns]
);

return [columnSelector, orderedVisibleColumns];
};