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Hannes M​�hleisen
@hfmuehleisen
I like databases. Co-creator of , co-founder . Research at .
Amsterdamhannes.muehleisen.orgJoined April 2010

Hannes M​�hleisen’s Tweets

DuckDB is now the first DBMS (afaik) to persist ART Indexes. Starting on the next release (i.e, current master branch), no more waiting for PK/FK rebuilds on reloads, or worrying about losing track of your created indexes :-).
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Been experimenting with Parquet, and for the analysis of these. And for the visualisation. Absolutely loving how fast DuckDB is for crunching many millions of bus locations. Just wish it had spatial queries baked in so I can skip GeoPandas entirely!
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Locations in London where buses regularly remain stationary for longer than 1 hour. Alt: Finding bus depots and parking bays using positions from @busopendata
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Sometimes a tweet stands out that makes you think "wow, I must try that!" A quick test of with ONSPD in , on a very basic laptop, counts postcodes by UK Parliamentary constituency in 1.49ms! Thanks
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The power of @DuckDB and @ApacheArrow: "We can select 304,851 interesting rows from all 1,547,741,381 in the 10 year dataset in < 3 seconds on a laptop!" Great demo! twitter.com/GarsBar35Plus/…
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Jordan Tigani needs no introduction. He was part of the team that created #googlecloud #bigquery . He is now designing a new analytical offering. In this episode of It Depends, Jordan takes us down the path of why we need to rethink our approach to moder…
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