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Nullable and non-nullable column from source #231

Description

Hello, I'm just curious with this plugin behavior when processing a nullable column. I'm using tap-mysql and target-clickhouse and I have noticed all of the created columns in the ClickHouse are non-nullable (except DateTime columns).

Is this by design or is there a config that can be changed to correctly copy the source table nullability?

As I'm writing this issue, I have found this Meltano issue meltano/meltano#6382 that discusses about Null config not passed to plugins. Maybe this is relevant to the above question.

Thank you

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