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This patch adds a new TypeCollection AbstractDataType that can be used by expressions to specify more than one expected input types. Author: Reynold Xin <rxin@databricks.com> Closes #7202 from rxin/type-collection and squashes the following commits: c714ca1 [Reynold Xin] Fixed style. a0c0d12 [Reynold Xin] Fixed bugs and unit tests. d8b8ae7 [Reynold Xin] Added TypeCollection. |
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