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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _transform_local_field_to_expression(expression, node, context):
 """Transform a LocalField compiler expression into its SQLAlchemy expression representation. Args: expression: expression, LocalField compiler expression. node: SqlNode, the SqlNode the expression applies to. context: CompilationContext, global compilation state and metadata. Returns: Expression, SQLAlchemy expression. """

    column_name = expression.field_name
    column = sql_context_helpers.get_column(column_name, node, context)
    return column