throwing an error if input tuple is not of type (str, str)

[ahmadnazeri]

Description

@local.df_transformation(
    variant="v1",
    inputs=[(compute_user_age, "v1")]
)

threw a useless error but now throws an error

TypeError: input tuple must be of type (str, str); got (LocalSource, str)

Type of change

Does this correspond to an open issue?

Closes #779

Select type(s) of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have fixed any merge conflicts

[codecov]

Codecov Report

Merging #780 (7c34d25) into main (6f7b498) will decrease coverage by 3.40%.
The diff coverage is 54.87%.

@@            Coverage Diff             @@
##             main     #780      +/-   ##
==========================================
- Coverage   59.71%   56.31%   -3.40%     
==========================================
  Files          63       66       +3     
  Lines       12408    12972     +564     
==========================================
- Hits         7409     7305     -104     
- Misses       4232     4962     +730     
+ Partials      767      705      -62     

Impacted Files	Coverage Δ
coordinator/coordinator.go	42.67% <0.00%> (-0.13%)	⬇️
helpers/compression/compression.go	0.00% <0.00%> (ø)
provider/k8s.go	9.30% <ø> (-20.90%)	⬇️
provider/provider_config/spark_config.go	58.89% <ø> (+1.84%)	⬆️
provider/provider_type/provider_type.go	100.00% <ø> (ø)
provider/redshift.go	85.24% <ø> (ø)
provider/spark.go	23.25% <ø> (+4.67%)	⬆️
provider/sql.go	65.47% <ø> (-0.31%)	⬇️
runner/worker/worker.go	78.57% <ø> (ø)
serving/serialize.go	74.81% <ø> (-19.58%)	⬇️
... and 7 more

... and 16 files with indirect coverage changes

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[anthonylasso]

I'd throw a unit test at _verify_tuple but otherwise approved.