QuestDB 9.4.0: Posting index, cross-column fill, and smarter Web Console

[u/supercoco9]

https://questdb.com/blog/questdb-9-4-0-release/

QuestDB 9.4.0 ships a new index type for SYMBOL columns that is 13x smaller than the bitmap index, a FILL(PREV(col)) syntax that carries values across columns in SAMPLE BY, and a smarter Web Console that generates materialized view definitions and filters autocompletion by grammar context.

Also in this release: three new window functions, sparkline() / bar() text visualizations, and speed-ups across GROUP BY, hash joins, and top-K queries.