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Refactor copying query result to clipboard #25152

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serhat359
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@serhat359 serhat359 commented Dec 27, 2023

Closes the issue #24901
Makes copying table result to clipboard faster by using a StringBuilder (JS/TS implementation).

I've locally tested before and after versions of the function with different inputs to make sure the new function behaves the same as before.

You can see the performance results comparing before and after below. Each data row contains 4 columns ('foo', 'bar', 'baz', row index). SkipNewLine means the variable shouldSkipNewLineAfterTrailingLineBreak config setting in the code.

Row Count SkipNewLine Before (millis) After (millis)
10 true 0.0029 0.0013
10 false 0.0021 0.0013
100 true 0.0115 0.0051
100 false 0.0115 0.0051
1000 true 0.8231 0.0499
1000 false 0.7725 0.0449
10000 true 238.3471 0.5279
10000 false 238.4657 0.4919
20000 true 1448.4772 1.1383
20000 false 1449.1719 1.1553
50000 true 9376.8284 3.0909
50000 false 9385.3372 3.1018

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@microsoft-github-policy-service agree

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Pull Request Test Coverage Report for Build 7342499286

  • 0 of 13 (0.0%) changed or added relevant lines in 1 file are covered.
  • 1 unchanged line in 1 file lost coverage.
  • Overall coverage decreased (-0.002%) to 41.607%

Changes Missing Coverage Covered Lines Changed/Added Lines %
src/sql/workbench/services/query/common/gridDataProvider.ts 0 13 0.0%
Files with Coverage Reduction New Missed Lines %
src/sql/workbench/services/connection/browser/connectionDialogWidget.ts 1 73.44%
Totals Coverage Status
Change from base Build 7292826141: -0.002%
Covered Lines: 30839
Relevant Lines: 69426

💛 - Coveralls

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@Charles-Gagnon Charles-Gagnon left a comment

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I'm pretty surprised that using reduce has that much of an impact. What kind of timing improvements were you seeing? i.e. with the same result data what was the time to copy with the original implementation vs what you have now?

@@ -133,7 +133,7 @@ export async function copySelectionToClipboard(clipboardService: IClipboardServi
const getMessageText = (): string => {
return nls.localize('gridDataProvider.loadingRowsInProgress', "Loading the rows to be copied ({0}/{1})...", processedRows, rowCount);
};
let resultString = '';
let headerString = '';
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nit: Instead of making a whole separate var and copying that into the array you create below I'd suggest just creating the array here and push the header to it directly on line 145.

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Yeah, I guess I could do that but I wanted the logic of string-join to be separated from the logic of creating the data rows.

@alanrenmsft
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@serhat359 thanks for the PR, could you please update the PR description to include the perf improvements? e.g.

rows, columns, time taken before, time taken after

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@alanrenmsft I added a table to the description that shows the performance improvements.

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@serhat359 thanks!

@serhat359
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When would this fix be merged to the main branch?

@cheenamalhotra cheenamalhotra merged commit d0e9e30 into microsoft:main Jan 15, 2024
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@serhat359 serhat359 deleted the make-copy-to-clipboard-faster branch January 20, 2024 11:41
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5 participants