U
    d                      @   s   d Z ddlmZ ddlmZmZmZmZ ddlm	Z	 ddl
mZ ddlmZmZ ddd	d
ddddgZG dd deZG dd deeeZG dd	 d	eZG dd
 d
eZG dd deZG dd deeZG dd deeZG dd deeZdS )z>
Classes to represent the definitions of aggregate functions.
    )
FieldError)CaseFuncStarWhen)IntegerField)Coalesce)FixDurationInputMixinNumericOutputFieldMixin	AggregateAvgCountMaxMinStdDevSumVariancec                       s   e Zd ZdZdZdZdZdZdZdZ	dddd fdd
Z
 fd	d
Z fddZ fddZd fdd	Zedd ZdddZ fddZ fddZ  ZS )r   z)%(function)s(%(distinct)s%(expressions)s)TNz%s FILTER (WHERE %%(filter)s)F)distinctfilterdefaultc                   sb   |r| j std| jj |d k	r>| jd k	r>t| jj d|| _|| _|| _t j	|| d S )Nz%s does not allow distinct.z does not allow default.)
allow_distinct	TypeError	__class____name__empty_result_set_valuer   r   r   super__init__)selfr   r   r   expressionsextrar    ?/tmp/pip-unpacked-wheel-7vj2equ7/django/db/models/aggregates.pyr   "   s    
zAggregate.__init__c                    s   dd t   D S )Nc                 S   s   g | ]
}|j qS r!   )_output_field_or_none).0er!   r!   r"   
<listcomp>0   s     z/Aggregate.get_source_fields.<locals>.<listcomp>)r   get_source_expressionsr   r    r!   r"   get_source_fields.   s    zAggregate.get_source_fieldsc                    s    t   }| jr|| jg S |S N)r   r'   r   )r   source_expressionsr    r!   r"   r'   2   s    
z Aggregate.get_source_expressionsc                    s   | j o| | _ t |S r*   )r   popr   set_source_expressions)r   exprsr    r!   r"   r-   8   s    z Aggregate.set_source_expressionsc                    s   t  ||||}|jo(|j|||||_|st t| }t|D ]F\}}	|	jrF|  | }
t|
drp|
jnt	|
}t
d|j||f qF|j }d kr|S t|dr|||||}d |_t|||jd}|j|_|S )Nnamez-Cannot compute %s('%s'): '%s' is an aggregateresolve_expression)output_field)r   r0   r   r   r'   	enumeratecontains_aggregatehasattrr/   reprr   r   r   r#   Z
is_summary)r   queryZallow_joinsZreuseZ	summarizeZfor_savecr   indexexprZbefore_resolvedr/   r   Zcoalescer    r!   r"   r0   <   s:       

zAggregate.resolve_expressionc                 C   sF   |   }t|dkr:t|d dr:d|d j| j f S tdd S )N   r   r/   z%s__%sz$Complex expressions require an alias)r'   lenr4   r/   lowerr   )r   r   r!   r!   r"   default_alias]   s    zAggregate.default_aliasc                 C   s   g S r*   r!   )r   aliasr!   r!   r"   get_group_by_colsd   s    zAggregate.get_group_by_colsc                    s   | j r
dnd|d< | jr|jjrr| j||\}}| j|d| j }t j||f||d|\}}|||fS | 	 }	d |	_|	
 }
t| j|
d d}|	t|g|
dd    tt|	j||f|S t j||f|S )	Nz	DISTINCT  r   template)rA   r   r   )Zthenr:   )r   r   featuresZ supports_aggregate_filter_clauseas_sqlfilter_templategetrA   r   copyr'   r   r-   r   r   )r   compiler
connectionZextra_contextZ
filter_sqlZfilter_paramsrA   ZsqlparamsrF   r+   	conditionr    r!   r"   rC   g   s<     

 zAggregate.as_sqlc                    s.   t   }| jr| j|d< | jr*| j|d< |S )Nr   r   )r   _get_repr_optionsr   r   )r   optionsr    r!   r"   rK      s    


zAggregate._get_repr_options)NTNFF)N)r   
__module____qualname__rA   r3   r/   rD   Zwindow_compatibler   r   r   r)   r'   r-   r0   propertyr=   r?   rC   rK   __classcell__r!   r!   r    r"   r      s2              !

c                   @   s   e Zd ZdZd ZdZdS )r   ZAVGTNr   rM   rN   functionr/   r   r!   r!   r!   r"   r      s   c                       s4   e Zd ZdZd Ze ZdZdZd fdd	Z	  Z
S )r   ZCOUNTTr   Nc                    sD   |dkrt  }t|t r(|d k	r(tdt j|fd|i| d S )N*z8Star cannot be used with filter. Please specify a field.r   )r   
isinstance
ValueErrorr   r   )r   
expressionr   r   r    r!   r"   r      s
    zCount.__init__)N)r   rM   rN   rR   r/   r   r1   r   r   r   rP   r!   r!   r    r"   r      s   c                   @   s   e Zd ZdZd ZdS )r   MAXNr   rM   rN   rR   r/   r!   r!   r!   r"   r      s   c                   @   s   e Zd ZdZd ZdS )r   ZMINNrX   r!   r!   r!   r"   r      s   c                       s.   e Zd Zd Zd fdd	Z fddZ  ZS )r   Fc                    s"   |rdnd| _ t j|f| d S )NSTDDEV_SAMPZ
STDDEV_POPrR   r   r   r   rV   sampler   r    r!   r"   r      s    zStdDev.__init__c                    s   t   d| jdkiS )Nr\   rY   r   rK   rR   r(   r    r!   r"   rK      s    zStdDev._get_repr_options)Fr   rM   rN   r/   r   rK   rP   r!   r!   r    r"   r      s   c                   @   s   e Zd ZdZd ZdZdS )r   ZSUMTNrQ   r!   r!   r!   r"   r      s   c                       s.   e Zd Zd Zd fdd	Z fddZ  ZS )r   Fc                    s"   |rdnd| _ t j|f| d S )NVAR_SAMPZVAR_POPrZ   r[   r    r!   r"   r      s    zVariance.__init__c                    s   t   d| jdkiS )Nr\   r_   r]   r(   r    r!   r"   rK      s    zVariance._get_repr_options)Fr^   r!   r!   r    r"   r      s   N)__doc__Zdjango.core.exceptionsr   Zdjango.db.models.expressionsr   r   r   r   Zdjango.db.models.fieldsr   Z%django.db.models.functions.comparisonr   Z!django.db.models.functions.mixinsr	   r
   __all__r   r   r   r   r   r   r   r   r!   r!   r!   r"   <module>   s,   r