ibzib commented on pull request #15174:
URL: https://github.com/apache/beam/pull/15174#issuecomment-918719763


   Hi @benWize the operators for BIT_OR etc. are taken from Calcite's 
SqlStdOperatorTable.
   
   
https://github.com/apache/beam/blob/be083918108579d07780a23f179e2bd62b3abcfe/sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/translation/SqlOperatorMappingTable.java#L79
   
   To override their return type inference, we will need replace the operators 
from SqlStdOperatorTable with custom operators defined in SqlOperators, and 
make sure nullability is set correctly. For example, BIT_XOR already has a 
custom operator, but it looks like the return type is non-null.
   
   
https://github.com/apache/beam/blob/be083918108579d07780a23f179e2bd62b3abcfe/sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/translation/SqlOperators.java#L164


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