Make the mysql readable metadata get a fixed order

[ruanhang1993]

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Motivation

Now listReadableMetadata in MysqlTableSource return a HashMap. So the returned metadata is orderless. Its order will be different between jdk 8 and jdk 11.

We should return a LinkedHashMap to use a fixed order.

Solution

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Alternatives

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Anything else?

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Are you willing to submit a PR?

• I'm willing to submit a PR!