Refactor: Change StandardTypes to be a enum class #16246

[abhikarkamkar]

Fix for #16246

Changed StandardTypes to be an enum class
To fetch enum value have added getter method

[linux-foundation-easycla]

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• ✅ Abhishek Karkamkar (e65eeb0)

[xumingming]

I think all the sites referencing StandardTypes should use the fields directly, rather than field.getEnumValue() because field.getEnumValue() is still type of string

[abhikarkamkar]

@xumingming hi can you please elaborate more ? I want to get value assigned to enum. For eg for given enum BIGINT("bigint")
to get value "bigint". I cannot use valueOf since it would give me BIGINT as value, I need "bigint" for that either I need to override toString() method or use an getter method. I have chosen getter approach

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