Comments (5)
Hi @alamb, I am wondering whether is there a way to implement the cube
and 'rollup' functions easily. the inner vector is expanded in the planner.
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Hi @xinlifoobar - another thing that we could potentially do is to work at this from the SQL statement level (rather than the Expr level)
As in implement a round trip test like this for a query with a grouping set:
https://github.com/apache/datafusion/blob/main/datafusion/sql/tests/sql_integration.rs#L4678-L4708
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I think from the Vec<Expr>
could not mapping back to the only unique Vec<Vec<Expr>>
and hence unparse the cube statement would be difficult. How about store another copy of origin Vec in the Cube and Rollup instance? i.e.,
pub enum GroupingSet {
/// Rollup grouping sets
Rollup(Vec<Expr>, Vec<Vec<Expr>>),
/// Cube grouping sets
Cube(Vec<Expr>, Vec<Vec<Expr>>),
/// User-defined grouping sets
GroupingSets(Vec<Vec<Expr>>),
}
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I made a mistake about the previous statements. The vector of cube and rollout is not expanded so the implement could be easy.
https://github.com/apache/datafusion/blob/main/datafusion/sql/src/expr/grouping_set.rs#L42-L81
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Thanks again @xinlifoobar
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