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datafusion::physical_plan::projection - Rust
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Module datafusion::physical_plan::projection

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Defines the projection execution plan. A projection determines which columns or expressions are returned from a query. The SQL statement SELECT a, b, a+b FROM t1 is an example of a projection on table t1 where the expressions a, b, and a+b are the projection expressions. SELECT without FROM will only evaluate expressions.

Structs