Document materialized views

[puzpuzpuz]

OSS PR: questdb/questdb#4937

[puzpuzpuz]

@glasstiger could you add new mat view-related permissions to the docs here?

[puzpuzpuz]

@glasstiger thanks for adding the permissions!

[github-actions]

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[javier]

is it intentional that the pages don't appear on the concepts or SQL syntax sections for now and need to be accessed directly by url?

[javier]

Do you think it would make sense to add some more advanced example showing you can use subqueries/CTEs, and even featuring things like window functions as long as you end yo doing a SAMPLE BY? As in this query here

create materialized view price_1m as (
  with r as (
    select *, lag(price) over(partition by symbol order by timestamp) as pprice 
      from btc_trades4
    ),
   t as ( (
    select symbol, last(price) as price, last(pprice) as pprice, timestamp 
      from r 
      order by timestamp) timestamp(timestamp) 
  ) select  timestamp, symbol, last(price) as price, last(pprice) as pprice
      from t sample by 1m
) timestamp(timestamp) partition by DAY;

[puzpuzpuz]

is it intentional that the pages don't appear on the concepts or SQL syntax sections for now and need to be accessed directly by url?

No, that was a bug. Fixed it (hopefully) in 7c3eda9

[puzpuzpuz]

Do you think it would make sense to add some more advanced example showing you can use subqueries/CTEs, and even featuring things like window functions as long as you end yo doing a SAMPLE BY? As in this query here

Sure. Feel free to add it yourself or I can add it, say, to the examples on the CREATE MATERIALIZED VIEW page, but I'll need a short description of the query.

[goodroot]

@javier FYI