| 1 | //! Provides a trait [`ReadColumn`] for extracting a single column from a [`crate::table::RowRef`]. |
| 2 | //! This is desirable as frequently, e.g. when evaluating filtered queries, |
| 3 | //! we are interested in only a single column (or a small set of columns), |
| 4 | //! and would like to avoid the allocation required by a `ProductValue`. |
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