Improve performance for dependent visualizations #15632
Merged
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Related to https://github.com/CartoDB/cartodb-platform/issues/6446
Calculate dependent visualizations with one single SQL query instead of AR with prefetch + Ruby. It looks like it's around 7 times faster now when having many dependencies.
For the acceptance, this user has a few datasets with ~500 maps. Besides checking the performance, we should ensure it properly calculates them: avoiding duplicates, taking into account maps with multiple layers, showing the right metadata...