mirrors/datafusion-sqlparse
1
0
Fork 0
mirror of https://github.com/apache/datafusion-sqlparser-rs.git synced 2025-10-11 14:32:04 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 3

Support aliasing columns

Browse source 
A table alias can specify new names for the columns within the aliased
table, in addition to a new name for the table itself.
This commit is contained in:
Nikhil Benesch 2019-05-30 17:23:05 -04:00
parent 73ed685879
commit 9abcac350e
No known key found for this signature in database
GPG key ID: F7386C5DEADABA7F
4 changed files with 60 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

21
src/sqlparser.rs
View file

@ -1208,6 +1208,23 @@ impl Parser {
}
}
/// Parse `AS identifier` when the AS is describing a table-valued object,
/// like in `... FROM generate_series(1, 10) AS t (col)`. In this case
/// the alias is allowed to optionally name the columns in the table, in
/// addition to the table itself.
pub fn parse_optional_table_alias(
&mut self,
reserved_kwds: &[&str],
) -> Result<Option<TableAlias>, ParserError> {
match self.parse_optional_alias(reserved_kwds)? {
Some(name) => {
let columns = self.parse_parenthesized_column_list(Optional)?;
Ok(Some(TableAlias { name, columns }))
}
None => Ok(None),
}
}
/// Parse one or more identifiers with the specified separator between them
pub fn parse_list_of_ids(&mut self, separator: &Token) -> Result<Vec<SQLIdent>, ParserError> {
let mut idents = vec![];
@ -1491,7 +1508,7 @@ impl Parser {
if self.consume_token(&Token::LParen) {
let subquery = Box::new(self.parse_query()?);
self.expect_token(&Token::RParen)?;
let alias = self.parse_optional_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
let alias = self.parse_optional_table_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
Ok(TableFactor::Derived {
lateral,
subquery,
@ -1507,7 +1524,7 @@ impl Parser {
} else {
vec![]
};
let alias = self.parse_optional_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
let alias = self.parse_optional_table_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
// MSSQL-specific table hints:
let mut with_hints = vec![];
if self.parse_keyword("WITH") {