Bump org.questdb:questdb from 7.3.9 to 8.1.4 in /modules/questdb

[dependabot]

Bumps org.questdb:questdb from 7.3.9 to 8.1.4.

Release notes

Sourced from org.questdb:questdb's releases.

8.1.4

It's spooky season. 🎃

What scares us the most? Poor performance. 😱

And just behind that, bugs and unintuitive UIs. Aaaahhhh!!

This release brings light to all of the aforementioned fears, as we continue with our seasonal theme of balance.

Breaking Changes 💥

SQL keyword quoting enforcement: SQL keywords used as column names now require double-quoting (e.g., "distinct", "order", "group"). While this was previously required, it's now enforced more strictly. This change supports PostgreSQL-compatible syntax and may break existing queries using unquoted keywords.

New features 🐣

Slick Web Console polish

Last patch, we introduced tabs to the Web Console experience. With tabs, navigating and work flows are easier and cleaner.

The polish continues in 8.1.4 and includes many small, tidy incremental improvements such as:

• More prominent error highlighting
• Prettier formatting when errors are generated by larger queries
• Revamped the look and feel of the table list panel — gone is the pop-up menu
• Once executed via shortcut, such as F9 or CTL + Enter, hitting the same shortcut will no longer cancel running SQL
• Indicates Running... when a query is running (... so you'd better go catch it!)
• While Running... the "play" button is replaced with "stop" button
• Removed = as word delimiter, so that expressions like == can be highlighted as errors

And more! Download, upgrade or checkout our live demo to see them.

Regression function regr_slope()

We've introduced the regr_slope(y, x) SQL function, which calculates the slope of the linear regression line determined by the dependent variable y and independent variable x. One might use such a function in statistical analysis, trend identification, and predictive modelling:

SELECT regr_slope(sales, time) FROM revenue_data;

This query computes the slope of sales over time. Great for trend spotting.

Support for COUNT(DISTINCT col) and STRING_AGG(DISTINCT col)

The DISTINCT keyword is now available within aggregate functions to operate on unique values.

Counting unique values:

SELECT count(DISTINCT user_id) FROM events;

... (truncated)

Commits

• c4384a9 [maven-release-plugin] prepare release 8.1.4
• 37e61d4 chore(ui): bump web console (#5101)
• 482cec7 test(core): fix fuzz test setup / by zero exception (#5100)
• 3ae8efb test(core): fix fuzz test setup / by zero exception (#5095)
• be21eca fix(core): fix rare crash on read binary and other var length column types (#...
• 16b8141 fix(core): fix checkpoint backward compatibility with snapshot semantics (#5091)
• 93d8081 perf(sql): parallelise correlation (#5079)
• ea3f60d fix(core): fix rare failure to restore from checkpoint, triggered by indexed ...
• ffcc240 fix(core): potential transaction leak in table reader/writer initialization o...
• 2899a02 perf(sql): parallelise sample and population covariance (#5074)
• Additional commits viewable in compare view

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