[gewenyu99]

Changes

A SQL inequality can include events where a property is missing. Explain this behavior and show how to require a non-null, non-empty string.

Checked the HogQL printer and existing test assertions. Formatting, MDX compilation, and independent source review passed.

The changed pages were loaded locally. The dev console shows existing renderer warnings.

Checklist

• I've read the docs and/or content style guides.
• Words are spelled using American English
• Use relative URLs for internal links
• I've checked the pages added or changed in the Vercel preview build
• If I moved a page, I added a redirect in vercel.json

[github-actions]

Deploy preview

Status	Details	Updated (UTC)
🟢 Ready	View preview	Nov 03, 2026 12:09AM

Changed pages

Page	Source
SQL expressions	contents/docs/sql/expressions.mdx

[github-actions]

Vale prose linter → found 0 errors, 4 warnings, 0 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/sql/expressions.mdx — 0 errors, 4 warnings, 0 suggestions

Line	Severity	Message	Rule
45:45	warning	Capitalize 'Data Warehouse' for PostHog's product. Use 'data warehouse' for the general industry concept.	PostHogBase.ProductNames
120:81	warning	'substrings' is a possible misspelling.	PostHogBase.Spelling
121:99	warning	'substring' is a possible misspelling.	PostHogBase.Spelling
123:67	warning	'substring' is a possible misspelling.	PostHogBase.Spelling

[github-actions]

Bundle report

Total JS (gzip)

10.38 MiB (+0.2 KiB / +0.0%)

Eager graph (modules shipped in each entrypoint's initial chunks)

Entrypoint	Eager size	Budget	Modules
✅ app	20.90 MiB (+2.4 KiB / +0.0%)	report-only	2119

Largest modules in the app closure

Module	Size
./src/data/mcp-tools.json	1472.2 KiB
css ./node_modules/.pnpm/css-loader@5.2.7_webpack@5.101.3/node_modules/css-loader/dist/cjs.js??ruleSet[1].rules[8].oneOf[1].use[1]!./node_modules/.pnpm/postcss-loader@4.3.0_postcss@8.5.6_webpack@5.101.3/node_modules/postcss-loader/dist/cjs.js??ruleSet[1].rules[8].oneOf[1].use[2]!./src/styles/global.css	839.4 KiB
./src/components/Stickers/Stickers.tsx	696.4 KiB
./node_modules/.pnpm/@posthog+brand@0.13.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/x-ray.mjs	481.2 KiB
./node_modules/.pnpm/@posthog+brand@0.13.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/trenchcoat.mjs	450.8 KiB
./node_modules/.pnpm/rehype-raw@7.0.0/node_modules/rehype-raw/lib/index.js + 29 modules	395.1 KiB
./node_modules/.pnpm/@posthog+brand@0.13.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/im-the-driver.mjs	385.8 KiB
./src/hooks/useCustomers.tsx + 61 modules	381.8 KiB
./node_modules/.pnpm/@posthog+brand@0.13.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/tourist.mjs	364.6 KiB
./node_modules/.pnpm/@posthog+icons@0.36.6_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js	354.8 KiB
./node_modules/.pnpm/react-markdown@8.0.7_@types+react@16.14.66_react@18.3.1/node_modules/react-markdown/lib/react-markdown.js + 88 modules	351.4 KiB
./src/components/ProductComparisonTable/index.tsx + 130 modules	314.3 KiB
./node_modules/.pnpm/framer-motion@14.0.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/framer-motion/dist/es/render/components/motion/proxy.mjs + 126 modules	287.2 KiB
./node_modules/.pnpm/@posthog+brand@0.13.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/doll-house.mjs	284.1 KiB
./node_modules/.pnpm/cloudinary-core@2.14.0_lodash@4.17.21/node_modules/cloudinary-core/cloudinary-core.js	281.9 KiB

---

Eager-graph budgets are report-only until a baseline is established. Sizes are gzip of public/**/*.js; eager size is webpack module source bytes for the modules actually shipped in the entrypoint's initial chunks (post-tree-shake).