Cut-off the relationship between RowReader and Meta-client.

[dangleptr]

There is another problem about module dependency.
Normally, we don't want RowReader has any relationship with Meta client. But due to the static methods in RowReader, RowReader has to depend on meta client module. It is no sense.

Let's refactor it in another issue.

Originally posted by @dangleptr in #233 (comment)

[sherman-the-tank]

RowReader depends on schema. SchemaManager depends on meta client. Not sure how to cut the dependency here

[dangleptr]

RowReader depends on schema
Yes

SchemaManager depends on meta client.
NO. Interface should not depend on implementation.

[sherman-the-tank]

RowReader depends on schema
Yes

SchemaManager depends on meta client.
NO. Interface should not depend on implementation.

I see. An abstract SchemaManager interface sounds good to me 👍