Consider both column annotation - current field and parent

[AndrewVorobey]

According documentation of Column.name: Each column will have the "BIG_SUBOBJ_FLAT" prefix

But it doesn't work if child object has column annotation with specified name. In this case parent's Column.name is ignored.

[nvamelichev]

Unfortunately this is a backwards incompatible change. There are already subobjects with column names specifically set to work around this issue...

The fix should only be enabled if the subobject column name contains no "_" (standard column namr separator) and/or a feature flag is set.

[AndrewVorobey]

The fix should only be enabled if the subobject column name contains no "_" (standard column namr separator).

It doesn't correct as well, because there are projects with properties named contains "_". And it would be too confusing to have different behavior based on variable name.

I could introduce a new flag useParentNameAsPrefix on annotation @Column.