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Editing: text.cpython-310.pyc
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This is used by `Concat` because not all backend databases support more than two arguments. �CONCATc s( | � � }tt|�j||fddd�|��S )N�%(expressions)sz || )r � arg_joiner)�coalescer r2 r )r r r r$ � coalescedr r r r/ G s ���zConcatPair.as_sqlitec r, )N� CONCAT_WSz!%(function)s('', %(expressions)s)r. r" r# r r r r N s ���zConcatPair.as_mysqlc C s$ | � � }|�dd� |�� D �� |S )Nc S s g | ] }t |td ���qS )� )r r )�.0� expressionr r r � <listcomp>Y s �z'ConcatPair.coalesce.<locals>.<listcomp>)�copy�set_source_expressions�get_source_expressions)r �cr r r r6 V s �zConcatPair.coalesce) r r r �__doc__r r/ r r6 r r r r r r2 @ s r2 c s0 e Zd ZdZdZdZ� fdd�Zdd� Z� ZS )�Concatz� Concatenate text fields together. Backends that result in an entire null expression when any arguments are null will wrap each argument in coalesce functions to ensure a non-null result. 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