code: def _get_output_columns(nodes, context):
      
      columns = []
      for node in nodes:
          for sql_output in sql_context_helpers.get_outputs(node, context):
              field_name = sql_output.field_name
              column = sql_context_helpers.get_column(field_name, node, context)
              column = column.label(sql_output.output_name)
              columns.append(column)
      return columns
docs: Get the output columns for a list of SqlNodes.
  
      Args:
          nodes: List[SqlNode], the nodes to get output columns from.
          context: CompilationContext, global compilation state and metadata.
  
      Returns:
          List[Column], list of SqlAlchemy Columns to output for this query.