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zhang2014 avatar zhang2014 commented on July 18, 2024

@gothug This is just for simpler implementation. This problem will be fixed by #73

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Lauri-Nomme avatar Lauri-Nomme commented on July 18, 2024

@gothug could you publish your test harness?
In theory, JDBC drivers should support forward and backward iteration (Connection.createStatement(ResultSet.TYPE_SCROLL_*)) in resultset (right now this driver does not support backward iteration anyway, so it can be optimized for forward only case), this is probably the reason why it was implemented like this.

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gothug avatar gothug commented on July 18, 2024

@Lauri-Nomme I did not commit these tests cleanly anywhere.

Please see the code for these tests here:
https://gist.github.com/gothug/9de3fc1fa6a3a9e7b71c22ab0a3c7a0c
https://gist.github.com/gothug/3b35fe0cec302efe6f8314a9cab8865e

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sundy-li avatar sundy-li commented on July 18, 2024

Now the performance improves a lot. See https://github.com/housepower/ClickHouse-Native-JDBC/blob/master/Benchmark.md.

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