[Feature] support function hll_from_base64

[learner1212]

Search before asking

• I had searched in the issues and found no similar issues.

Description

doris have the bitmap function bitmap_from_base64, can hll function support function hll_from_base64 like bitmap?

Use case

No response

Related issues

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[superdiaodiao]

Could you give us more info？ Like, how this function behaves in another OLAP engine or mysql or others.

[learner1212]

Could you give us more info？ Like, how this function behaves in another OLAP engine or mysql or others.

我们现在的场景是： 在导入doris之前，为了减少数据量，我们使用spark或者flink按照不同维度进行了聚合， 而我们的指标又需要用到近似计算去计算uv值， 目前这个场景我们只能直接将明细数据导入doris， 这个对 doris的压力就非常大。
因此我们希望Doris能支持这个函数， 有了这个函数， 我们就可以在spark或者flink编写udaf hll_to_base64， 在聚合的时候计算出base64值， 然后在导入Doris的时候使用 hll_from_base64完成导入。
非常感谢关注这个问题。

[cambyzju]

Could you give us more info？ Like, how this function behaves in another OLAP engine or mysql or others.

我们现在的场景是： 在导入doris之前，为了减少数据量，我们使用spark或者flink按照不同维度进行了聚合， 而我们的指标又需要用到近似计算去计算uv值， 目前这个场景我们只能直接将明细数据导入doris， 这个对 doris的压力就非常大。 因此我们希望Doris能支持这个函数， 有了这个函数， 我们就可以在spark或者flink编写udaf hll_to_base64， 在聚合的时候计算出base64值， 然后在导入Doris的时候使用 hll_from_base64完成导入。 非常感谢关注这个问题。

doris也是支持udf的，有试过吗？

[learner1212]

Could you give us more info？ Like, how this function behaves in another OLAP engine or mysql or others.

我们现在的场景是： 在导入doris之前，为了减少数据量，我们使用spark或者flink按照不同维度进行了聚合， 而我们的指标又需要用到近似计算去计算uv值， 目前这个场景我们只能直接将明细数据导入doris， 这个对 doris的压力就非常大。 因此我们希望Doris能支持这个函数， 有了这个函数， 我们就可以在spark或者flink编写udaf hll_to_base64， 在聚合的时候计算出base64值， 然后在导入Doris的时候使用 hll_from_base64完成导入。 非常感谢关注这个问题。

doris也是支持udf的，有试过吗？

我看官网文档写的支持类型里没有二进制类型， 应该是不支持吧？

[learner1212]

Could you give us more info？ Like, how this function behaves in another OLAP engine or mysql or others.

I can't found this function in any other OLAP engine. I need convert a base64 string(from spark/flink agg result) into a hll binary, and we found doris support function bitmap_from_base64 that can convert a base64 string to bitmap binary, it looks a bit similar to what we are looking for.

[DO12345whatever]

I have a similar issue where we want to import data from Apache Druid, which stores HLL- and Thetasketch colums as b64 encoded strings.
Additionally it is not even possible to export/import Doris tables with hll colums, as those are not supported by orc/parquet and csv simply drops their content https://doris.apache.org/docs/dev/data-operate/export/outfile/#notice

[superdiaodiao]

I can't found this function in any other OLAP engine. I need convert a base64 string(from spark/flink agg result) into a hll binary, and we found doris support function bitmap_from_base64 that can convert a base64 string to bitmap binary, it looks a bit similar to what we are looking for.

OK, I will do it, please assign this to me.

[learner1212]

I can't found this function in any other OLAP engine. I need convert a base64 string(from spark/flink agg result) into a hll binary, and we found doris support function bitmap_from_base64 that can convert a base64 string to bitmap binary, it looks a bit similar to what we are looking for.

OK, I will do it, please assign this to me.

@morningman Can you assign this issue to him?