Support subqueryload for SQLAlchemy models #2203
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In some cases subqueryload is much more efficient than joinload.
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In some cases subqueryload is much more efficient than joinload.
Documentation said that
list_select_relatedwill generatesubqueryloadbut it was generatingjoinload- I am not sure if this was a mistake in docs or in an implementation, but as one might want to choose different options to different datasets I have decided to not change current behaviour and add a new one.