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If any expression is null the return value is database-specific: On PostgreSQL, the maximum not-null expression is returned. On MySQL, Oracle, and SQLite, if any expression is null, null is returned. �GREATESTc r3 )Nr4 z+Greatest must take at least two expressionsr5 r8 r r r r � r; zGreatest.__init__c � t � j||fddi|��S )z Use the MAX function on SQLite.r/ �MAX�r r" r r r r r" � � zGreatest.as_sqlite�r+ r, r- r. r/ r r" r0 r r r r rQ { � rQ c sF e Zd ZdZe� Z� fdd�Z� fdd�Z� fdd�Zdd � Z � Z S ) � JSONObject� JSON_OBJECTc s8 g }|� � D ] \}}|�t|�|f� qt� j|� d S r< )�items�extendr r r )r �fieldsr9 �key�valuer r r r � s zJSONObject.__init__c s& |j jstd��t� j||fi |��S )Nz7JSONObject() is not supported on this database backend.)�features�has_json_object_functionr r r r r r r r � s �zJSONObject.as_sqlc sB | � � }|�dd� t|�� �D �� tt|�j||fddi|��S )Nc S s, g | ]\}}|d dkrt |t� �n|�qS )r4 r )r r )rB �indexr r r r rC � s ��z,JSONObject.as_postgresql.<locals>.<listcomp>r/ �JSONB_BUILD_OBJECT)rD rE � enumerater= r rY r )r r r r rD r r r r) � s �� ���zJSONObject.as_postgresqlc K s* G dd� d�}| j ||f|� dd�|��S )Nc @ s e Zd Zdd� ZdS )z'JSONObject.as_oracle.<locals>.ArgJoinerc S s2 dd� t |d d d� |dd d� �D �}d�|�S )Nc S s g | ]}d � |��qS )z VALUE )�join)rB �argr r r rC � s z@JSONObject.as_oracle.<locals>.ArgJoiner.join.<locals>.<listcomp>r4 � z, )�zipre )r �argsr r r re � s ( z,JSONObject.as_oracle.<locals>.ArgJoiner.joinN)r+ r, r- re r r r r � ArgJoiner� s rj z,%(function)s(%(expressions)s RETURNING CLOB))� arg_joinerr r( )r r r r rj r r r r* � s ���zJSONObject.as_oracle) r+ r, r- r/ r r r r r) r* r0 r r r r rY � s rY c rP )�Leastz� Return the minimum expression. If any expression is null the return value is database-specific: On PostgreSQL, return the minimum not-null expression. On MySQL, Oracle, and SQLite, if any expression is null, return null. �LEASTc r3 )Nr4 z(Least must take at least two expressionsr5 r8 r r r r � r; zLeast.__init__c rS )z Use the MIN function on SQLite.r/ �MINrU r r r r r" � rV zLeast.as_sqliterW r r r r rl � rX rl c s$ e Zd ZdZdZ� fdd�Z� ZS )�NullIf�NULLIFr4 c s> | � � d }t|t�r|jd u rtd��t� j||fi |��S )Nr z2Oracle does not allow Value(None) for expression1.)r= � isinstancer r_ r7 r r )r r r r � expression1r r r r* � s zNullIf.as_oracle)r+ r, r- r/ �arityr* r0 r r r r ro � s ro N)r. � django.dbr � django.db.models.expressionsr r �django.db.models.fieldsr � django.db.models.fields.jsonr �django.utils.regex_helperr r r1 rH rQ rY rl ro r r r r �<module> s ?!/
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