Use IsBlank and Trim to check for any empty or whitespace strings.

IsBlank(Trim(Column2))

Trim will remove any whitespace and IsBlank will return a true/false if the string is empty or not after the trim.

IsBlank

Trim

UPDATE: Check only for IsBlank where Column2 is evaluated, the way you wrote it it's checking if Column2 = bool which will have a type mismatch since it's checking a string vs a bool, change to this:

ClearCollect(Test,LookUp(Table1,Column1=DataCardValue6.Text && IsBlank(Trim(Column2))))
Answer from kshkarin on Stack Overflow
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Code SharePoint
codesharepoint.com › PowerPlatform › check-table-is-empty
PowerApps Check if table or collection is empty and has no records - Code SharePoint
The IsEmpty function in Power Apps is used to determine whether a table or collection is empty, meaning it contains no records. This function is particularly useful for validating data, checking if results are returned from a query, or ensuring ...
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › Checking-if-record-is-empty › td-p › 923532
Solved: Checking if record is empty - Power Platform Community
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Dynamics Community
community.dynamics.com › blogs › post
How to check if a collection is empty in Power Apps canvas apps
Hello everyone and welcome to my blog. In today’s blog, I will show how can you check if a collection is empty in Power Apps. There are primarily two ways you can check if a collection is empty. The first is using the IsEmpty function.
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › Checking-for-empty-field-values-in-records-in-gallery › td-p › 365345
Checking for empty field values in records in gallery
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › How-to-check-if-table-is-empty-for-each-record-and-records › td-p › 351359
Solved: How to check if table is empty for each record and...
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Microsoft Learn
learn.microsoft.com › en-us › power-platform › power-fx › reference › function-isblank-isempty
Blank, Coalesce, IsBlank, and IsEmpty functions - Power Platform | Microsoft Learn
The IsEmpty function tests whether a table contains any records. It's equivalent to using the CountRows function and checking for zero. You can check for data-source errors by combining IsEmpty with the Errors function.
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Reddit
reddit.com › r/powerapps › what is the best way to show only records with empty collumns from sp list in gallery
r/PowerApps on Reddit: What is the best way to show only records with empty collumns from SP list in Gallery
January 24, 2023 -

Hello,

so the exact question is:
How to display only filtered records in the gallery, filtered by condition that one of the collumns is empty (has no value in it).

So let's imagine I have a Sharepoint list 'X', and in it i have many collumns and one of them is called 'C'. In the powerapps I want to have a vertical gallery, which would only show the records from the list X that have the collumn C empty.

If I use the IsBlank() or other conditions I get delegation warning, what is the correct way to do it, or what is the workaround?

I even made a view of the sharepoint list, but views apparently can't be used inside powerapps.

Any pro tips? ;)

Find elsewhere
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YouTube
youtube.com › zbigniew lukowski - tutorials
Check if Record exists in PowerApps #52 - YouTube
Today we'll create a button to check whether or not a record exists in our context (Gallery.Selected). This solution will work for either Sharepoint or Datav...
Published   August 31, 2023
Views   4K
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Code SharePoint
codesharepoint.com › PowerPlatform › check-value-is-blank-or-not
PowerApps Check if value is blank or not - Code SharePoint
The IsBlank function in Power Apps is used to determine whether a value is blank or not. This function is particularly useful for checking whether fields are empty, whether controls contain data, or for validating user input.
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › Validate-or-show-a-message-in-label-if-field-is-empty › td-p › 449721
Validate or show a message in label, if field is empty
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › Set-variable-if-collection-has-empty-record › td-p › 583105
Solved: Set variable if collection has empty record
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › Check-if-the-collection-is-empty › td-p › 466956
Solved: Check if the collection is empty - Power Platform Community
June 8, 2024 - If you look under the example section in the document linked below it shows that checking the collection directly IsEmpty(CollectionName) should work, but it doesn't, as I have run into the same issue you did. https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-isblank-isempty
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › Unsure-how-to-check-if-a-value-is-empty-and-use-an-IF-statement › td-p › 163643
Forums | Microsoft Power Platform Community
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Debajmecrm
debajmecrm.com › home › how to check null values in power apps canvas apps
How to check NULL values in Power Apps Canvas Apps - Debajit's Power Apps & Dynamics 365 Blog
July 14, 2021 - Check NULL condition in Canvas app, Check for empty value in Power Apps, Compare with NULL value in Canvas apps.
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › IsEmpty-Returns-FALSE-on-an-LookUp-of-an-Empty-Collection › td-p › 1578939
Solved: IsEmpty() Returns FALSE on an LookUp of an Empty C...
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Brent Thrasher
brentthrasher.com › home › blog › how to check if a record exists in a database for power apps
How to Check If a Record Exists in a Database for Power Apps - Brent Thrasher
October 28, 2023 - I have found the most efficient method is using the First and Filter functions. These are built-in functions in power apps that allow you to return the first record or an empty table based on a filter condition.
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Microsoft Power Platform Community
powerusers.microsoft.com › t5 › Building-Power-Apps › check-is-a-collection-field-empty › td-p › 332984
check is a collection field empty - Power Platform Community
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Stack Exchange
sharepoint.stackexchange.com › questions › 309153 › using-isblank-in-formula-for-date-time-picker-field-on-power-apps
sharepoint online - Using IsBlank in formula for Date Time Picker field on Power Apps - SharePoint Stack Exchange
Pretty new to SharePoint and Power Apps so would like to ask if what I am trying to do is feasible. I have a Date Time Picker field in my formula in Power Apps and currently, its default value is s...