Upserter for MySQL

[flycash]

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Please check existing issues first to avoid duplication and answer the questions below before submitting your issue.

Use case(s)

Support ON DUPLICATE KEY clause for MySQL dialect.

Although we define a function to generate upsert for PgSQL, you don't need to handle it now, let's support PgSQL in next phase.

(Please state use cases, what problem will this feature solve?)

Proposed Solution

(Please describe your proposed design/solution, if any)

Alternatives Considered

(Other possible options for solving the problem?)

Additional Context

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(If you can, link to the line of code that might be helpful to explain the context)

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This issue is inactive for a long time.

[github-actions[bot]]

This issue is inactive for a long time.