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There is no max limit on the number of dimensions you can have. We have see people successfully working with druid in productions from a few to around a hundred dimensions . Check below thread for more details. https://groups.google.com/g/druid-user/c/OgvnG3nVTNM?pli=1

Thousands of columns is both fine and routine there is no hard limit but stuff will eventually start to degrade in performance as you add dimensions. What exactly fails first depends on way too many factors to list out. In SQL based ingestion there is a limit of 2000 columns you can generate per query (see https://druid.apache.org/docs/latest/multi-stage-query/reference.html#error_TooManyColumns) that limit was picked as a known safe limit. So consider >2000 as being "at your own risk" (but some people do that)

thanks my columns are 7000 but works fine and query seems not that bad. i am just curious really thank you