feat: implement `DataFrame.checkpoint` and `DataFrame.localCheckpoint`#1882

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copilot/implement-dataframe-checkpoint-localcheckpoint

Commits on May 10, 2026

feat: implement DataFrame.checkpoint and DataFrame.localCheckpoint

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shehabgamin
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test: clarify null preservation assertions; doc cached_relations

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shehabgamin
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fix: preserve duplicate columns in checkpointed relations

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shehabgamin
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Potential fix for pull request finding

shehabgamin
and
Copilot
authored
Potential fix for pull request finding

shehabgamin
and
Copilot
authored
fix: checkpoint storage parity and formatting

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shehabgamin
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fix: create checkpoint storage directory

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shehabgamin
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fix: clean up checkpoint storage

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shehabgamin
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docs: clarify checkpoint storage lifecycle

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shehabgamin
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fix: clean up checkpoint storage on session drop

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shehabgamin
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fix: default local checkpoint to disk storage to avoid OOM

Copilot
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shehabgamin
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fix: handle empty DataFrame in disk checkpoint materialization

Copilot
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shehabgamin
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fix: improve error handling for checkpoint path existence check

Copilot
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shehabgamin
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