Closed realtebo closed 5 months ago
After digging into the rabbit hole for half a day, one genius, a coworker, found the trigger, the root cause of the bug
All starts because we have to export a strange csv file where _the first column of the first line is an empty cell. AND we have no headings in the csv
When your (excellent and unreplaceable) code try to understand if there are data already exported, read the 'a1' cell and checks if it's populated. So it's a false negative, in this case, and the code thinks there are no already exported data, and so, restart from 'a1' and override in the Sheet class the whole already exported data.
Here again to add another detail.
We had success adding WithStrictNullComparision
concern.
Using this workaround, the performance are a bit worse than without using it, but we can succesfully export all rows, without using headers, in a situation when a1 cell is always empty
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Is the bug applicable and reproducable to the latest version of the package and hasn't it been reported before?
What version of Laravel Excel are you using?
3.1.55
What version of Laravel are you using?
10.46.0
What version of PHP are you using?
8.1.3
Describe your issue
I hopw this issue will find you well.
I am exporting a huge amount of data, more than 10.000 rows
If we DO NOT use the concern "WIthHeadings", the output file is only 1.000 rows.
We think the problem is thiscode block: https://github.com/SpartnerNL/Laravel-Excel/blob/3.1/src/Sheet.php#L658-L676
Because when the code estabilish if the first line is not empty, actually is returning always false. So the export restart overwriting, at each 1000 rows of chunk, as per your code, from first line.
This behaviour doesn't happens if using an heading row.
But we absolutely need to do not have heading rows in our file.
How can the issue be reproduced?
Try to export a csv with a few of thousands of rows without
WithHeadings
ConcernsWhat should be the expected behaviour?
Every rows should be saved into file, not last 1.000