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minor: add more document to Wildcard expr #7822

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Oct 14, 2023
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minor: add more document to Wildcard expr #7822

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10 changes: 8 additions & 2 deletions datafusion/expr/src/expr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -165,9 +165,15 @@ pub enum Expr {
InSubquery(InSubquery),
/// Scalar subquery
ScalarSubquery(Subquery),
/// Represents a reference to all fields in a schema.
/// Represents a reference to all available fields.
///
/// This expr has to be resolved to a list of columns before translating logical
/// plan into physical plan.
Wildcard,
/// Represents a reference to all fields in a specific schema.
/// Represents a reference to all available fields in a specific schema.
///
/// This expr has to be resolved to a list of columns before translating logical
/// plan into physical plan.
QualifiedWildcard { qualifier: String },
/// List of grouping set expressions. Only valid in the context of an aggregate
/// GROUP BY expression list
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