Adds unit test cases of mathematical expressions working with null
literal
#2478
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Which issue does this PR close?
Closes #1188 .
Rationale for this change
Since #2364 is merged, mathematical function calls with
null
literal work well. This pr is just adding unit test cases of mathematical expressions working withnull
literal.What changes are included in this PR?
math_expressions.rs
Are there any user-facing changes?
No.