fix: preserve numeric and text types in CSV charts

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This pull request was authored by a coding agent.

📝 Summary

• Stacked on fix: render dotted chart columns when data falls back to CSV #10856; this PR targets codex/fix-dotted-chart-columns.
• Use backend column metadata to parse CSV charts so numeric inf, +inf, and -inf remain distinct from missing values, while text such as inf and 001 keeps its original representation.
• Retain full-CSV automatic inference when backend metadata is absent. Sample-inferred types only guide the chart controls.
• Avoid unnecessary refetches for equivalent schemas while reparsing when column types change.
• Preserve chart date parsing and the table loader's existing BigInt and number-like string handling.

Screenshot

• User-provided screenshot from the parent PR showing dotted user.name labels rendering correctly. This image illustrates the parent fix.

📋 Pre-Review Checklist

• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions.
• Any AI generated code has been reviewed line-by-line by the human PR author, who stands by it.
• Video or media evidence is provided for any visual changes (optional).

✅ Merge Checklist

• I have read the contributor guidelines.
• Documentation has been updated where applicable, including docstrings for API changes.
• Tests have been added for the changes made.

Written by GPT-6 on Codex

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Coverage Report for ./frontend

Status	Category	Percentage	Covered / Total
🔵	Lines	58.24%	22181 / 38085
🔵	Statements	58.16%	22567 / 38796
🔵	Functions	51.65%	5038 / 9753
🔵	Branches	51.8%	11602 / 22396

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
frontend/src/components/data-table/charts/charts.tsx	52.05%	53.26%	42.42%	53.19%	115-123, 128, 132-149, 153-168, 182-195, 199-221, 235, 250-251, 271-275, 278, 344, 349, 354, 356, 394, 397-410, 498-499, 522, 561-562, 568, 570, 576
frontend/src/plugins/impl/vega/loader.ts	93.33%	89.61%	100%	93.1%	45, 48, 51, 58, 76, 106, 117, 121-122, 202
frontend/src/plugins/impl/vega/utils.ts	70.83%	82.14%	60%	70.83%	33-43, 66

Generated in workflow #21523 for commit 3fc0b55 by the Vitest Coverage Report Action

[cubic-dev-ai]

Review completed against the latest diff

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[Copilot]

🟡 Changes recommended

Schema-less lazy tables incorrectly use sample-derived explicit parsing instead of full-CSV automatic inference.

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Pull request overview

Adds schema-aware CSV parsing for chart data while preserving text values and supporting infinities.

Changes:

• Adds numeric infinity and opt-in date parsing.
• Passes table column types into chart CSV loading.
• Expands loader and ChartPanel tests.

File summaries

File	Description
frontend/src/plugins/impl/vega/utils.ts	Adds configurable date parsing.
frontend/src/plugins/impl/vega/loader.ts	Parses numeric infinity values.
frontend/src/plugins/impl/vega/__tests__/vega.test.ts	Tests typed CSV parsing.
frontend/src/plugins/impl/vega/__tests__/utils.test.ts	Tests date parsing options.
frontend/src/components/data-table/charts/charts.tsx	Applies field metadata to CSV charts.
frontend/src/components/data-table/charts/__tests__/chart-panel.test.tsx	Tests chart loading and schema changes.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 1
• Review effort level: Balanced

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