Andrey Aleksandrov created IGNITE-10471:
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             Summary: SQL: Alter table to add column sytax doesn't support the user types but drop column can drop such fields
                 Key: IGNITE-10471
                 URL: https://issues.apache.org/jira/browse/IGNITE-10471
             Project: Ignite
          Issue Type: Improvement
          Components: sql
    Affects Versions: 2.6
            Reporter: Andrey Aleksandrov
             Fix For: 2.8


Looks like ALTER COLUMN commands could be used only on a subset of supported types (that could be used in CREATE TABLE syntax):

[https://apacheignite-sql.readme.io/docs/data-types]

But using query entities we can provide to use a field that has user types.

This fields can be used in 

ALTER TABLE CACHE_NAME DROP COLUMN COLUMN_NAME

But it can't be used as next:

ALTER TABLE CACHE_NAME  ADD COLUMN COLUMN_NAME 'type'

Where type is a user's one.

Possible we should think about supporting POJO and enums.



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