Fix Polars queries

[ritchie46]

Follow up on #734

Tested all queries on a subset:

run parquet queries
[0.046, 0.002, 0.001],
[0.002, 0.002, 0.002],
[0.001, 0.001, 0.001],
[0.001, 0.001, 0.001],
[0.002, 0.002, 0.001],
[0.004, 0.003, 0.003],
[0.001, 0.001, 0.001],
[0.002, 0.002, 0.001],
[0.002, 0.002, 0.002],
[0.003, 0.003, 0.003],
[0.001, 0.001, 0.001],
[0.002, 0.001, 0.001],
[0.004, 0.004, 0.005],
[0.005, 0.003, 0.004],
[0.006, 0.005, 0.005],
[0.003, 0.002, 0.003],
[0.004, 0.004, 0.005],
[0.004, 0.004, 0.004],
[0.007, 0.006, 0.005],
[0.001, 0.001, 0.001],
[0.003, 0.003, 0.003],
[0.006, 0.006, 0.006],
[0.008, 0.007, 0.005],
[0.011, 0.008, 0.012],
[0.005, 0.005, 0.004],
[0.003, 0.003, 0.003],
[0.005, 0.005, 0.005],
[0.003, 0.003, 0.003],
[0.004, 0.004, 0.004],
[0.002, 0.002, 0.002],
[0.005, 0.007, 0.005],
[0.006, 0.005, 0.004],
[0.003, 0.004, 0.003],
[0.004, 0.003, 0.004],
[0.004, 0.004, 0.005],
[0.004, 0.004, 0.004],
[0.003, 0.003, 0.003],
[0.004, 0.004, 0.003],
[0.003, 0.003, 0.003],
[0.005, 0.004, 0.006],
[0.005, 0.005, 0.005],
[0.004, 0.004, 0.004],
[0.002, 0.003, 0.003],