Module datafusion::physical_plan::projection
source · [−]Expand description
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
Execution plan for a projection