Improve struct

[ritchie46]

fixes #3464
fixes #3465
fixes #3461

[codecov-commenter]

Codecov Report

Merging #3468 (9b06b73) into master (edc4dbd) will decrease coverage by 4.98%.
The diff coverage is 95.04%.

@@            Coverage Diff             @@
##           master    #3468      +/-   ##
==========================================
- Coverage   77.53%   72.54%   -4.99%     
==========================================
  Files         404      406       +2     
  Lines       69639    69746     +107     
==========================================
- Hits        53992    50597    -3395     
- Misses      15647    19149    +3502     

Impacted Files	Coverage Δ
polars/polars-arrow/src/kernels/rolling/mod.rs	94.80% <ø> (ø)
.../polars-arrow/src/kernels/rolling/no_nulls/mean.rs	50.94% <ø> (ø)
...s/polars-arrow/src/kernels/rolling/no_nulls/mod.rs	86.73% <ø> (ø)
...ars-arrow/src/kernels/rolling/no_nulls/quantile.rs	95.31% <ø> (ø)
...s/polars-arrow/src/kernels/rolling/no_nulls/sum.rs	92.12% <ø> (ø)
.../polars-arrow/src/kernels/rolling/nulls/min_max.rs	89.09% <ø> (ø)
...polars-arrow/src/kernels/rolling/nulls/quantile.rs	86.45% <ø> (ø)
py-polars/src/series.rs	76.63% <0.00%> (-0.06%)	⬇️
...lars/polars-arrow/src/kernels/rolling/nulls/sum.rs	92.72% <92.72%> (ø)
...ars/polars-arrow/src/kernels/rolling/nulls/mean.rs	98.03% <98.03%> (ø)
... and 142 more

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