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Array of string was not implemented?

See original GitHub issue

We migrated to the new driver and we’re getting java.lang.IllegalArgumentException: Only singleton array is allowed. I checked the repo and see that Array of numbers was implemented but not array of other stuff. Am I right? Is there a way to overcome this error?

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:9

github_iconTop GitHub Comments

zhicwucommented, Mar 4, 2022

I checked the repo and see that Array of numbers was implemented but not array of other stuff.

Unlike array of primitives, array of String is simply treated as Object. That’s why there’s no update(String[]) method in ClickHouseValue class and it’s not handled specifically in update(Object).

We have a table in CH with a field of type Array(String) and we’re trying to insert into it.

I see. I assume that you’re using PreparedStatement for batch insert.

If that’s the case, could you please use input function as shown in examples? To be more specific, instead of insert into mytable values(?,?,?), use insert into mytable select col1, col2, col3 from input('col1 String, col2 DateTime64(3), col3 Array(String)'), or insert into mytable for convenience. The differences are:

  1. the first query has no type information so the driver has to “guess” based on type of given parameters, and worse than that, the driver will generate a large SQL statement like insert into table values(...)(...)... and send it to server
  2. the last two provide type information needed by the driver, so it can take care of type conversion automatically and stream the data(in binary format) to the server, which is usually faster with less memory usage(on client side) and network traffic

Meanwhile, since there’ll be another patch release this weekend. I’ll see if I can enhance the driver accordingly.

eugeniasimichcommented, Mar 8, 2022

Thanks @zhicwu!

Read more comments on GitHub >

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