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Keeping no columns with Table.keep_only_columns results in an empty Table with a row count above 0 #318

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Marsmaennchen221 opened this issue May 24, 2023 · 2 comments · Fixed by #386
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Keeping no columns with Table.keep_only_columns results in an empty Table with a row count above 0 #318

Marsmaennchen221 opened this issue May 24, 2023 · 2 comments · Fixed by #386
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@alex-senger @patrikguempel
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@Marsmaennchen221
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Marsmaennchen221 commented May 24, 2023 •
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Describe the bug

If you use the method Table.keep_only_columns with an empty list on a table that contains at least one row, you get an empty table with a row count above 0.

The methods Table.remove_columns has the same bug if you remove all columns.

To Reproduce

from safeds.data.tabular.containers import Table

table = Table({"Column1": [1, 2, 3], "Column2": [4, 5, 6]})
table = table.keep_only_columns([])

print(table)
print(table.number_of_rows)

The print statement returns 3 but the table is empty

Expected behavior

The row count should be 0 if the table is empty

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Additional Context (optional)

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@Marsmaennchen221 Marsmaennchen221 added the bug 🪲 Something isn't working label May 24, 2023
@lars-reimann
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lars-reimann commented May 24, 2023 •
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Related to #123.

@Marsmaennchen221 Marsmaennchen221 mentioned this issue May 24, 2023
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@alex-senger alex-senger mentioned this issue Jun 23, 2023
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@alex-senger alex-senger linked a pull request Jun 23, 2023 that will close this issue
fix: Keeping no columns with Table.keep_only_columns results in an empty Table with a row count above 0 #386
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alex-senger added a commit that referenced this issue Jun 24, 2023
@alex-senger @patrikguempel
@megalinter-bot @sibre28
fix: Keeping no columns with Table.keep_only_columns results in an em…
15dab06 
…pty Table with a row count above 0 (#386)

Closes #318 

Fixes Bug:

If you use the method Table.keep_only_columns with an empty list on a
table that contains at least one row, you get an empty table with a row
count above 0.

### Summary of Changes

<!-- Please provide a summary of changes in this pull request, ensuring
all changes are explained. -->

---------

Co-authored-by: patrikguempel <patrikguempel@gmail.com>
Co-authored-by: megalinter-bot <129584137+megalinter-bot@users.noreply.github.com>
Co-authored-by: Simon Breuer <86068340+sibre28@users.noreply.github.com>
lars-reimann pushed a commit that referenced this issue Jun 30, 2023
@semantic-release-bot
chore(release): 0.14.0 [skip ci]
d6f012c 
## [0.14.0](v0.13.0...v0.14.0) (2023-06-30)

### Features

* 290 properties for width-height of image ([#359](#359)) ([d9ebdc1](d9ebdc1)), closes [#290](#290)
* Add `find_edges` method to `Image` class ([#383](#383)) ([d14b6ce](d14b6ce)), closes [#288](#288)
* Add `StandardScaler` transformer ([#316](#316)) ([57b0572](57b0572)), closes [#142](#142)
* Add docstrings to the getter methods for hyperparameters in Regression and Classification models ([#371](#371)) ([9073f04](9073f04)), closes [#313](#313)
* Added `Table.group_by` to group a table by a given key ([#343](#343)) ([afb98be](afb98be)), closes [#160](#160)
* Added and improved errors and warnings in the table transformers ([#372](#372)) ([544e307](544e307)), closes [#152](#152)
* added crop() method in image and tests ([#365](#365)) ([eba8163](eba8163))
* added invert_colors method ([#367](#367)) ([1e4d110](1e4d110))
* adjust brightness and contrast of image ([#368](#368)) ([1752feb](1752feb)), closes [#289](#289) [#291](#291)
* blur Image method ([#363](#363)) ([c642176](c642176))
* check that methods of table can handle an empty table ([#314](#314)) ([686c2e7](686c2e7)), closes [#123](#123)
* convert image to grayscale ([#366](#366)) ([1312fe7](1312fe7)), closes [#287](#287)
* enhance `replace_column` to accept a list of new columns ([#312](#312)) ([d50c5b5](d50c5b5)), closes [#301](#301)
* Explicitly throw `UnknownColumnNameError` in `TaggedTable._from_table` ([#334](#334)) ([498999f](498999f)), closes [#333](#333)
* flip images / eq method for image ([#360](#360)) ([54f4ae1](54f4ae1)), closes [#280](#280)
* improve `table.summary`. Catch `ValueError` thrown by `column.stability` ([#390](#390)) ([dbbe0e3](dbbe0e3)), closes [#320](#320)
* improve error handling of `column.stability` when given a column that contains only None ([#388](#388)) ([1da2499](1da2499)), closes [#319](#319)
* Improve Error Handling of classifiers and regressors ([#355](#355)) ([66f5f64](66f5f64)), closes [#153](#153)
* Resize image ([#354](#354)) ([3a971ca](3a971ca)), closes [#283](#283)
* rotate_left and rotate_right added to Image ([#361](#361)) ([c877530](c877530)), closes [#281](#281)
* set kernel of support vector machine ([#350](#350)) ([1326f40](1326f40)), closes [#172](#172)
* sharpen image ([#364](#364)) ([3444700](3444700)), closes [#286](#286)

### Bug Fixes

* Keeping no columns with Table.keep_only_columns results in an empty Table with a row count above 0 ([#386](#386)) ([15dab06](15dab06)), closes [#318](#318)
* remove default value of `positive_class` parameter of classifier metrics ([#382](#382)) ([58fc09e](58fc09e))
* remove default value of `radius` parameter of `blur` ([#378](#378)) ([7f07f29](7f07f29))
@lars-reimann
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🎉 This issue has been resolved in version 0.14.0 🎉

The release is available on:

Your semantic-release bot 📦🚀

@lars-reimann lars-reimann added the released Included in a release label Jun 30, 2023
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@lars-reimann @Marsmaennchen221 @alex-senger @patrikguempel