adriangb commented on issue #21968: URL: https://github.com/apache/datafusion/issues/21968#issuecomment-4358004158
I was able to reproduce this using data derived from TPCH data. Essentially I copied the data row wise and column wise to produce 128 files with 1024 columns. Then ran a simple query against them. I was able to reproduce a 7x slowdown with criterion warming up (so metadata is cached) and a 30x slowdown on cold `datafusin-cli` runs. I'm hoping this will be a good target for profiling + systematically fixing the places we are no efficient on wide schemas. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
