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Mention SQLSelectItem::Wildcard in ASTNode::SQLWildcard docs

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as a follow-up to https://github.com/andygrove/sqlparser-rs/issues/52
This commit is contained in:
Nickolay Ponomarev 2019-06-09 22:01:14 +03:00
parent 846f2ff1d9
commit cfb77912f7
1 changed files with 6 additions and 3 deletions
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9
src/sqlast/mod.rs
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@ -56,9 +56,12 @@ pub type SQLIdent = String;
pub enum ASTNode {
/// Identifier e.g. table name or column name
SQLIdentifier(SQLIdent),
/// Unqualified wildcard (`*`). SQL allows this in limited contexts (such as right
/// after `SELECT` or as part of an aggregate function, e.g. `COUNT(*)`, but we
/// currently accept it in contexts where it doesn't make sense, such as `* + *`
/// Unqualified wildcard (`*`). SQL allows this in limited contexts, such as:
/// - right after `SELECT` (which is represented as a [SQLSelectItem::Wildcard] instead)
/// - or as part of an aggregate function, e.g. `COUNT(*)`,
///
/// ...but we currently also accept it in contexts where it doesn't make
/// sense, such as `* + *`
SQLWildcard,
/// Qualified wildcard, e.g. `alias.*` or `schema.table.*`.
/// (Same caveats apply to SQLQualifiedWildcard as to SQLWildcard.)