If a CSV input contains new attributes Lat and Long that are not defined on the reader feature type, what will the dynamic writer do with those attributes?

If a CSV input contains new attributes Lat and Long that are not defined on the reader feature type, what will the dynamic writer do with those attributes?

• A. The writer will include them in the output, unmodified.
• B. The reader will read them.
• C. The writer will include them in the output, but will truncate their length to 22.
• D. The reader will not read them.

Answer: (C)

When using a dynamic writer, attributes flowing through the stream don’t have to be predefined in the writer’s feature type. The dynamic writer can carry through new attributes it encounters on the input and include them in the output by creating dynamic fields on the fly. However, formats often impose limits on field lengths. In this scenario, Lat and Long appear on the input but aren’t defined in the reader’s schema, so the dynamic writer will still write them to the output. But their content is constrained by a maximum length of 22 characters, so the values are written truncated to 22 characters if needed. In practice, short latitude/longitude values will pass through unchanged, while longer values would be cut to 22 characters. This illustrates how dynamic writing allows additional attributes to be emitted while honoring the target format’s length limit.

When using a dynamic writer, attributes flowing through the stream don’t have to be predefined in the writer’s feature type. The dynamic writer can carry through new attributes it encounters on the input and include them in the output by creating dynamic fields on the fly. However, formats often impose limits on field lengths. In this scenario, Lat and Long appear on the input but aren’t defined in the reader’s schema, so the dynamic writer will still write them to the output. But their content is constrained by a maximum length of 22 characters, so the values are written truncated to 22 characters if needed. In practice, short latitude/longitude values will pass through unchanged, while longer values would be cut to 22 characters. This illustrates how dynamic writing allows additional attributes to be emitted while honoring the target format’s length limit.