Is Fabric pipeline copy activity dynamic mapping support copying only partial source data to sink?

[Winnie2024]

I have some template files, each with different column names. And users may need to customize new files with exsting tempaltes by combination randomly. Here is my design:

I create a delta table containing all the columns of all template fiels and define all the columns mapping  in one file like below:

{
"type": "TabularTranslator",
"mappings": [
{
"source": {
"name": "T1_F1",
"type": "String",
"physicalType": "String"
},
"sink": {
"name": "A_1",
"physicalType": "string"
}
},
{
"source": {
"name": "T1_F2",
"type": "String",
"physicalType": "String"
},
"sink": {
"name": "A_2",
"physicalType": "string"
}
},
{
"source": {
"name": "T2_F1",
"type": "String",
"physicalType": "String"
},
"sink": {
"name": "B_1",
"physicalType": "string"
}
},
{
"source": {
"name": "T2_F2",
"type": "String",
"physicalType": "String"
},
"sink": {
"name": "B_2",
"physicalType": "string"
}
}

],
"typeConversion": true,
"typeConversionSettings": {
"allowDataTruncation": true,
"treatBooleanAsNumber": false
}
}

and put it in the paramtere for the Fabric pipeline with parameter key"mapping" as below

And define the dynamic mapping as below:

I can copy the files with ALL columns defined in the prediffined-mapping. But failed with any file with only partial columns. 

Take the example above, I can copy copy files with columns "T1_F1" ,"T1_F2","T2_F1" and "T2_F2".

But I CAN NOT copy file with only "T1_F1"  and "T1_F2"

How to do solve this?

[v-nikhilan-msft]

Hi @Winnie2024 
Thanks for using Fabric Community.
At this time, we are reaching out to the internal team to get some help on this. We will update you once we hear back from them.
Thanks 

[v-nikhilan-msft]

Hi @Winnie2024 
Can you please confirm what is the error you are getting? A screenshot would help.
Thanks

[v-nikhilan-msft]

Hi @Winnie2024 
We haven’t heard from you on the last response and was just checking back to see if you can provide the details asked above.

Thanks

[v-nikhilan-msft]

Hi @Winnie2024 
We haven’t heard from you on the last response and was just checking back to see if you can provide the details asked above.