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Mask-based nullable columns for CTable - #694

Merged

FrancescAlted merged 48 commits into

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mask-based-nulls

Aug 11, 2026

Commits on Aug 8, 2026
- Add NullChannel and make string predicates null-aware (mask-based-nulls 0-1)
  
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- Let schema specs declare where their nulls live (mask-based-nulls 2)
  
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- Pin the negation corner in both query forms (mask-based-nulls follow-up)
  
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- Give mask columns a place to keep their nulls (mask-based-nulls 3)
  
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- Make mask columns readable and writable (mask-based-nulls 4)
  
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- Stop reducing mask columns over their fill (mask-based-nulls 5)
  
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- Round-trip Arrow and Parquet losslessly (mask-based-nulls 6)
  
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- Sort, group and query mask columns by their nulls (mask-based-nulls 7)
  
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- Let columns migrate between null channels (mask-based-nulls 8)
  
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- Make a validity sidecar the default (mask-based-nulls 9)
  
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- Summarise indexes over the rows that carry a value (mask-based-nulls 10)
  
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- Say plainly what an older reader sees for a version-3 table
  
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- Target 4.11.0, not 4.10.2
  
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- Give the NaT in the timestamp test a unit
  
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- Stop re-reading every groupby column once per row
  
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- Let the null-storage suites run on NumPy 1.x
  
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Commits on Aug 9, 2026
- Keep an empty text cell apart from a missing one in CSV
  
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- Stop losing text and nulls on the way through CSV and extend()
  
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- Let add_column say a row has no value
  
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- Check the two null storages against each other
  
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- Stop isin() matching what stands in for a null
  
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- Send nulls to pandas as NA
  
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- Let cov() see a mask column's nulls
  
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- Skip the Arrow equivalence cases when pyarrow is absent
  
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Commits on Aug 10, 2026
- Give a null predicate its third value
  
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- Fix the two defects a post-landing review turned up
  
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- Let the Kleene suite run on NumPy 1.x too
  
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- Stop convert_nulls() flattening a nested column
  
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- Reverse a descending sort by complement, not by negation
  
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- Read a mask column's nulls in the order its values arrive
  
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- Stop reading an injected validity guard as a user's negation
  
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- Write and read CSV as UTF-8, not as the locale's codec
  
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- Keep a struct column nested across save and reopen
  
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- Let a timestamp column be written through col[key] = value
  
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- Record the review fixes in the release notes and the plan
  
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- Read a hole-free sidecar as a slice, not as a fancy index
  
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- Let a CSV's encoding be named rather than only defaulted
  
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- Note that a null broadcasts like any other value
  
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- Translate nullity when extending from another table
  
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- Answer a dictionary column's nulls per live row, and pandas' per value
  
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- Record that a bool ndarray column was widened to uint8
  
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- Show a null as None in a row, not as the fill
  
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- Record the second round of review findings
  
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- Stop a memory-scaling assertion failing on unrelated allocations
  
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- Merge remote-tracking branch 'origin/main' into mask-based-nulls
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- Wait for dim mode instead of asserting it instantly
  
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- Derive the fill-list bound from the pointer size, and skip it on WASM
  
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- Wait for a Textual screen instead of pausing a fixed number of times
  
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Commits

Commits on Aug 8, 2026

Commits on Aug 9, 2026

Commits on Aug 10, 2026