add presto pipeline component

[mertkavi]

A Kubeflow Presto Pipeline component to submit a query to Presto.

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This change is 

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[k8s-ci-robot]

Hi @mertkavi. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mertkavi]

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[Ark-kun]

It seems that this component does not have any outputs.
Usually, components have outputs so that the data they produce can be used.

[mertkavi]

@Ark-kun Presto queries write a file by nature. For example, create table programs with (format = 'parquet') ... query create a table and write Parquet files to Object Storage. That's why this component has not output.

[Ark-kun]

@Ark-kun Presto queries write a file by nature. For example, create table programs with (format = 'parquet') ... query create a table and write Parquet files to Object Storage. That's why this component has not output.

Even if the component creates something in an external system, it's useful to have outputs. You can output table name, object id or URI. Then a downstream component can use that to run another query or read the data. Even if something like table name comes from input it's still useful to "pass-through" and output it. This a way of establishing dependencies between tasks.

[mertkavi]

Thank you for comment @Ark-kun I added the output.

[Ark-kun]

Are there going to be other presto-related components in the future? If so, it might be better to move the code to, say, components/presto/query/. Usually the path schema is company_name[/group_name]/component_name/.

[Ark-kun]

/lgtm

[k8s-ci-robot]

@mertkavi: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[mertkavi]

Are there going to be other presto-related components in the future? If so, it might be better to move the code to, say, components/presto/query/. Usually the path schema is company_name[/group_name]/component_name/.

It makes sense. I moved it.

[Ark-kun]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Ark-kun

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