Determines whether this is a first-order clause.

Description

Checks to see if the current clause has any time-related keys.
If so, it’s first-order.

Parameters

$queryarrayrequired

Query clause.

Return

Source

protected function is_first_order_clause( $query ) {
	$time_keys = array_intersect( $this->time_keys, array_keys( $query ) );
	return ! empty( $time_keys );
}

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