Fix sqlancer#1209: UNARY_PLUS operator now converts values to DOUBLE PRECISION #1220
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Description
This PR addresses an issue where the UNARY_PLUS operator (+) wasn't properly handling type promotion. In SQL (including Materialize/PostgreSQL), applying the unary + operator on a numeric value should promote it to DOUBLE PRECISION. The previous implementation simply returned the input value without performing any conversion, which could lead to mismatches in expected vs. actual results during testing.
Changes
Changed UNARY_PLUS operator's return type from INT to FLOAT (double precision). Implemented proper conversion of values to double precision. Added handling for different input types (int, boolean, string, float). Added missing asDouble() method to FloatConstant class. Added comprehensive test cases to verify the proper behavior
Testing
Added a tests file
TestMaterializeUnaryPlus.javato verify the changes made.Closes #1209