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Merge pull request #100 from benesch/nested-joins

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Support nested joins
This commit is contained in:
Nikhil Benesch 2019-06-07 22:37:53 -04:00 • committed by GitHub
commit 5f9f17de8a
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3 changed files with 82 additions and 8 deletions
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29
src/sqlparser.rs
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@ -1538,14 +1538,27 @@ impl Parser {
pub fn parse_table_factor(&mut self) -> Result<TableFactor, ParserError> {
let lateral = self.parse_keyword("LATERAL");
if self.consume_token(&Token::LParen) {
let subquery = Box::new(self.parse_query()?);
self.expect_token(&Token::RParen)?;
let alias = self.parse_optional_table_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
Ok(TableFactor::Derived {
lateral,
subquery,
alias,
})
if self.parse_keyword("SELECT")
|| self.parse_keyword("WITH")
|| self.parse_keyword("VALUES")
{
self.prev_token();
let subquery = Box::new(self.parse_query()?);
self.expect_token(&Token::RParen)?;
let alias = self.parse_optional_table_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
Ok(TableFactor::Derived {
lateral,
subquery,
alias,
})
} else if lateral {
parser_err!("Expected subquery after LATERAL, found nested join".to_string())
} else {
let base = Box::new(self.parse_table_factor()?);
let joins = self.parse_joins()?;
self.expect_token(&Token::RParen)?;
Ok(TableFactor::NestedJoin { base, joins })
}
} else if lateral {
self.expected("subquery after LATERAL", self.peek_token())
} else {