[GitHub] [calcite] yingyuwang opened a new pull request, #2803: [CALCITE-5130] AssertionError: "Conversion to relational algebra failed to preserve datatypes" when union VARCHAR literal and CAST(null AS INTEGER)

[GitBox]

yingyuwang opened a new pull request, #2803:
URL: https://github.com/apache/calcite/pull/2803

   In AbstractTypeCoercion#promoteToVarChar() return resultType with 
nullability if any of the types being promoted are nullable.


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