Omero.table issues

[dominikl]

Not sure if omero-server repository is the right place, move if necessary.

Some issues with Omero.tables:

• The supported data types are kind of arbitrary: https://docs.openmicroscopy.org/omero-blitz/5.5.8/javadoc/omero/grid/Column.html E. g. Why is there a DoubleColumn, but no FloatColumn (but there is a FloatArrayColumn)?
• There is a DatasetColumn, however it doesn't seem to work. Trying to create a Table with DatasetColumn I get:

Caused by: omero.InternalException
    serverStackTrace = "Traceback (most recent call last):
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/util/decorators.py", line 69, in exc_handler
                            rv = func(*args, **kwargs)
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/util/decorators.py", line 29, in handler
                            return func(*args, **kwargs)
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/tables.py", line 274, in initialize
                            self.storage.initialize(cols)
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/util/decorators.py", line 91, in with_lock
                            return func(*args, **kwargs)
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/hdfstorageV2.py", line 94, in flush_after
                            return func(*args, **kwargs)
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/hdfstorageV2.py", line 366, in initialize
                            self.__definition = columns2definition(cols)
                          File "/home/omero/workspace/OMERO-server/.venv3/lib64/python3.6/site-packages/omero/columns.py", line 50, in columns2definition
                            instance = column.descriptor(pos=i)
                        AttributeError: 'DatasetColumn' object has no attribute 'descriptor'
                        "

[joshmoore]

Think the current questions can be on omero-py.

• Why is there a DoubleColumn, but no FloatColumn (but there is a FloatArrayColumn)?

Pretty sure this is because when mixing Java/Python/PostgreSQL data types there was no use with one of the column types. Everything got converted somewhere to the maximal width.

• Trying to create a Table with DatasetColumn I get:

Seems like a pretty straight-forward bug.