HSD import: Don't fail if identical type is defined multiple times

[florianesser]

Example case: If the source schema is comprised of multiple Oracle SQL queries, the HSD export will export basic Oracle types (e.g. NUMBER or VARCHAR2) along with the table definitions for every such query. If two queries use the same basic Oracle types, this will lead to an error in a subsequent import (Multiple definitions of type X).

[thorsten-reitz]

@florianesser is this something you want to conclude for the upcoming release?

[thorsten-reitz]

@florianesser can you give an estimate how much time it would take to complete this?

[florianesser]

@thorsten-reitz Hard to say without looking at it in depth again as I don't remember how far along this actually was and what might be missing. Probably would need half a day to set up an environment and do some tests.

[thorsten-reitz]

@florianesser ok thanks, then I would say we let this rest for a while longer.

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