Improve column projection performance #842
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rjzamora
reviewed
Feb 6, 2024
| continue | ||
| seen.add(p._name) | ||
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|
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| column_union.extend(p._projection_columns) |
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Is it worthwhile to have this in a if len(p.columns) > 0: block like before?
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That is a very very rare case so I thought removing it is more efficient than keeping it, it’s only relevant for index projections, so the new logic should be more efficient in almost all cases
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| column_union = sorted( | ||
| flattened_columns, | ||
| key=lambda x: x[0] if isinstance(x, tuple) else x or MinType(), | ||
| ) | ||
| column_union = sorted(flattened_columns) |
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Did something change here that I'm not seeing, or was the key= never necessary?
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The logic changed a little bit, tuples now end up in the except branch. Since tuples are rare, it’s better to slow them down than to slow the default path down with the check
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cc @rjzamora
this cuts runtime in half on my machine, not super fancy but just avoids as much work as possible without changing the logic