SliceGroup TextColumn handling revision #990
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The original handling approach (converting them to string column) causes problems, including possibly exploding memory requirements. The new approach works directly with text columns when used to split a table, while retaining the old handling when using other column types, as it is more efficient.
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Description
avoids copying of text columns to stringColumns to use the original slice approach. In the new approach the bytes produced by each row in the text column are used.
Testing
Did you add a unit test? No. There is already a test