xitep commented on code in PR #2185:
URL:
https://github.com/apache/datafusion-sqlparser-rs/pull/2185#discussion_r2759217198
##########
src/parser/mod.rs:
##########
@@ -14184,27 +14188,27 @@ impl<'a> Parser<'a> {
}
/// Parse a `CONNECT BY` clause (Oracle-style hierarchical query support).
- pub fn parse_connect_by(&mut self) -> Result<ConnectBy, ParserError> {
- let (condition, relationships) = if
self.parse_keywords(&[Keyword::CONNECT, Keyword::BY]) {
- let relationships = self.with_state(ParserState::ConnectBy,
|parser| {
- parser.parse_comma_separated(Parser::parse_expr)
- })?;
- self.expect_keywords(&[Keyword::START, Keyword::WITH])?;
- let condition = self.parse_expr()?;
- (condition, relationships)
- } else {
- self.expect_keywords(&[Keyword::START, Keyword::WITH])?;
- let condition = self.parse_expr()?;
- self.expect_keywords(&[Keyword::CONNECT, Keyword::BY])?;
- let relationships = self.with_state(ParserState::ConnectBy,
|parser| {
- parser.parse_comma_separated(Parser::parse_expr)
- })?;
- (condition, relationships)
- };
- Ok(ConnectBy {
- condition,
- relationships,
- })
+ pub fn maybe_parse_connect_by(&mut self) -> Result<Vec<ConnectByKind>,
ParserError> {
+ let mut clauses = Vec::with_capacity(2);
+ loop {
+ if let Some(idx) = self.parse_keywords_(&[Keyword::START,
Keyword::WITH]) {
Review Comment:
unfortunately that won't work. (i tried.)
the underlying method calls `parse_keyword -> peek_keyword -> peek_token_ref
-> peek_nth_token_ref` will skip leading whitespace. therefore, an index
remembered before invoking this call chain might point to a whitespace instead
of the identified keyword.
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