docs: Add column statistics fields to information_schema.columns documentation by inkeep[bot] · Pull Request #18031 · PostHog/posthog.com

inkeep · 2026-06-30T11:19:13Z

Changes

This PR documents three new columns added to system.information_schema.columns for data warehouse tables (from PostHog/posthog#66967):

Column	Type	Description
`null_fraction`	Float (nullable)	Fraction of NULL values in the column, 0.0–1.0
`min_value`	String (nullable)	Minimum observed value from Delta-log stats
`max_value`	String (nullable)	Maximum observed value from Delta-log stats

These statistics are computed from the Delta log for data warehouse tables and are NULL for non-warehouse tables or columns that haven't been profiled yet.

Users can now query column statistics to understand data quality before writing queries:

SELECT column_name, data_type, null_fraction, min_value, max_value
FROM system.information_schema.columns
WHERE table_name = 'stripe_charges'

Related PR

feat(data-warehouse): surface column statistics in information_schema.columns posthog#66967

This PR was created by the Inkeep Content Writer agent, which is maintained by the Docs and Wizard team. Please reach out on Slack for help if needed.

…schema.columns Updates both information_schema.columns sections to document the three new column statistics fields added in PostHog/posthog#66967. These fields surface Delta-log profiling stats for data warehouse tables.

github-actions · 2026-06-30T11:20:07Z

Vale prose linter → found 4 errors, 34 warnings, 2 suggestions in your markdown

Full report → Copy the linter results into an LLM to batch-fix issues.

Linter being weird? Update the rules!

contents/docs/data-warehouse/sources/posthog.mdx — 4 errors, 34 warnings, 2 suggestions

Line	Severity	Message	Rule
2:29	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
5:47	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
9:4	warning	'PostHog data warehouse tables' heading should be in sentence case, and product names should be capitalized.	`PostHogBase.SentenceCase`
9:12	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
35:4	warning	Capitalize 'Error Tracking' for PostHog's product. Use 'Error tracking' for the general industry concept.	`PostHogBase.ProductNames`
76:104	suggestion	Address the reader directly. Use 'you' instead of 'the user'.	`PostHogDocs.DirectAddress`
94:102	warning	Capitalize 'Marketing Analytics' for PostHog's product. Use 'marketing analytics' for the general industry concept.	`PostHogBase.ProductNames`
105:61	suggestion	Address the reader directly. Use 'you' instead of 'the user'.	`PostHogDocs.DirectAddress`
110:49	warning	'keypress' is a possible misspelling.	`PostHogBase.Spelling`
181:129	warning	Capitalize 'Feature Flags' for PostHog's product. Use 'feature flags' for the general industry concept.	`PostHogBase.ProductNames`
181:166	warning	Capitalize 'Experiments' for PostHog's product. Use 'experiments' for the general industry concept.	`PostHogBase.ProductNames`
195:39	warning	Capitalize 'Logs' for PostHog's product. Use 'logs' for the general industry concept.	`PostHogBase.ProductNames`
195:76	warning	Capitalize 'Logs' for PostHog's product. Use 'logs' for the general industry concept.	`PostHogBase.ProductNames`
275:66	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
281:43	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
292:85	warning	Capitalize 'Endpoints' for PostHog's product. Use 'endpoints' for the general industry concept.	`PostHogBase.ProductNames`
309:27	warning	Capitalize 'Endpoints' for PostHog's product. Use 'endpoints' for the general industry concept.	`PostHogBase.ProductNames`
309:72	warning	Capitalize 'Endpoints' for PostHog's product. Use 'endpoints' for the general industry concept.	`PostHogBase.ProductNames`
309:105	warning	Capitalize 'Endpoints' for PostHog's product. Use 'endpoints' for the general industry concept.	`PostHogBase.ProductNames`
341:51	warning	Capitalize 'Error Tracking' for PostHog's product. Use 'error tracking' for the general industry concept.	`PostHogBase.ProductNames`
421:56	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	`PostHogBase.EnDash`
486:280	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	`PostHogBase.EnDash`
486:292	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
504:44	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
527:65	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	`PostHogBase.EnDash`
527:72	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
528:69	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
529:69	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
533:68	warning	'traversers' is a possible misspelling.	`PostHogBase.Spelling`
582:62	warning	'nullable' is a possible misspelling.	`PostHogBase.Spelling`
583:35	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
583:58	warning	'nullable' is a possible misspelling.	`PostHogBase.Spelling`
604:66	warning	'nullable' is a possible misspelling.	`PostHogBase.Spelling`
605:65	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	`PostHogBase.EnDash`
605:72	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
606:69	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
607:69	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	`PostHogBase.ProductNames`
617:68	warning	'traversers' is a possible misspelling.	`PostHogBase.Spelling`
624:67	warning	'nullable' is a possible misspelling.	`PostHogBase.Spelling`
626:75	warning	'nullable' is a possible misspelling.	`PostHogBase.Spelling`

github-actions · 2026-06-30T11:20:21Z

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github-actions · 2026-06-30T11:24:07Z

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github-actions · 2026-06-30T16:08:24Z

Bundle report

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Eager-graph budgets are report-only until a baseline is established. Sizes are gzip of public/**/*.js; eager size is webpack module source bytes.

github-actions · 2026-06-30T16:09:23Z

Hey @Gilbert09! This docs PR was generated for you by an agent. You're responsible for reviewing and merging it into production.

Review and approve the PR
Merge the PR
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inkeep Bot requested a review from Gilbert09 June 30, 2026 11:19

Merge branch 'master' into docs-writer-ai-update-2026-06-30T11-17-52-…

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