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[FIX] point_of_sale: fix memory error
When there are too many (millions) of POS order lines associated to opened POS sessions we get too many taxes, most are duplicated. This causes a MemorryError. Example queries from a real DB: ``` > select count(distinct r.account_tax_id) from pos_order_line l join pos_order o on o.id = l.order_id join pos_session s on s.id = o.session_id join account_tax_pos_order_line_rel r on r.pos_order_ line_id = l.id where s.state != 'closed' +-------+ | count | |-------| | 24 | +-------+ > select count(r.account_tax_id) from pos_order_line l join pos_order o on o.id = l.order_id join pos_session s on s.id = o.session_id join account_tax_pos_order_line_rel r on r.pos_order_line_id = l.id where s.state != 'closed' +---------+ | count | |---------| | 2504539 | +---------+ ``` opw-3295467 closes #124194 X-original-commit: 0d220a7 Signed-off-by: Christophe Simonis (chs) <chs@odoo.com>
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