In this case you have to combine a command text (GetColumns) with specific information about the table you are interested in, which is quite odd. A helper function with a parameter would probably have made more sense.
Notice that the two calls to GetCollection of the metadata provider, in the last two code snippets, return objects of different classes that inherit from TDBXTable (ultimately a custom TDBXValueList). In the last case the class returned is TDBXColumnsTableStorage, while in the previous code snippet the class was TDBXTablesTableStorage.
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