CalculatedColumn parsing error handling
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naleeha commented
Currently if parsing of the calculated column definition fails, different part of the code (CalcutedColumnVisitor) handles it differently
- return null
- return NullCalculatedColumnClause
- return ErrorClause
We should use ErrorClause going forward for all parsing errors
Also the Atlr grammer doesn't seem to include Null as a potential values. So NullCalculatedColumnClause maybe redundant for now.
There is separate issue raised for handling null in filter and calculated column #1344