<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_output_columns(nodes, context):
 """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. """

    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