yoavcloud commented on code in PR #1513:
URL:
https://github.com/apache/datafusion-sqlparser-rs/pull/1513#discussion_r1843725375
##########
src/parser/mod.rs:
##########
@@ -1013,175 +1189,22 @@ impl<'a> Parser<'a> {
let next_token = self.next_token();
let expr = match next_token.token {
- Token::Word(w) => match w.keyword {
- Keyword::TRUE | Keyword::FALSE if
self.dialect.supports_boolean_literals() => {
- self.prev_token();
- Ok(Expr::Value(self.parse_value()?))
- }
- Keyword::NULL => {
- self.prev_token();
- Ok(Expr::Value(self.parse_value()?))
- }
- Keyword::CURRENT_CATALOG
- | Keyword::CURRENT_USER
- | Keyword::SESSION_USER
- | Keyword::USER
- if dialect_of!(self is PostgreSqlDialect | GenericDialect)
=>
- {
- Ok(Expr::Function(Function {
- name: ObjectName(vec![w.to_ident()]),
- parameters: FunctionArguments::None,
- args: FunctionArguments::None,
- null_treatment: None,
- filter: None,
- over: None,
- within_group: vec![],
- }))
- }
- Keyword::CURRENT_TIMESTAMP
- | Keyword::CURRENT_TIME
- | Keyword::CURRENT_DATE
- | Keyword::LOCALTIME
- | Keyword::LOCALTIMESTAMP => {
- self.parse_time_functions(ObjectName(vec![w.to_ident()]))
- }
- Keyword::CASE => self.parse_case_expr(),
- Keyword::CONVERT => self.parse_convert_expr(false),
- Keyword::TRY_CONVERT if self.dialect.supports_try_convert() =>
self.parse_convert_expr(true),
- Keyword::CAST => self.parse_cast_expr(CastKind::Cast),
- Keyword::TRY_CAST => self.parse_cast_expr(CastKind::TryCast),
- Keyword::SAFE_CAST => self.parse_cast_expr(CastKind::SafeCast),
- Keyword::EXISTS
- // Support parsing Databricks has a function named
`exists`.
- if !dialect_of!(self is DatabricksDialect)
- || matches!(
- self.peek_nth_token(1).token,
- Token::Word(Word {
- keyword: Keyword::SELECT | Keyword::WITH,
- ..
- })
- ) =>
- {
- self.parse_exists_expr(false)
- }
- Keyword::EXTRACT => self.parse_extract_expr(),
- Keyword::CEIL => self.parse_ceil_floor_expr(true),
- Keyword::FLOOR => self.parse_ceil_floor_expr(false),
- Keyword::POSITION if self.peek_token().token == Token::LParen
=> {
- self.parse_position_expr(w.to_ident())
- }
- Keyword::SUBSTRING => self.parse_substring_expr(),
- Keyword::OVERLAY => self.parse_overlay_expr(),
- Keyword::TRIM => self.parse_trim_expr(),
- Keyword::INTERVAL => self.parse_interval(),
- // Treat ARRAY[1,2,3] as an array [1,2,3], otherwise try as
subquery or a function call
- Keyword::ARRAY if self.peek_token() == Token::LBracket => {
- self.expect_token(&Token::LBracket)?;
- self.parse_array_expr(true)
- }
- Keyword::ARRAY
- if self.peek_token() == Token::LParen
- && !dialect_of!(self is ClickHouseDialect |
DatabricksDialect) =>
- {
- self.expect_token(&Token::LParen)?;
- let query = self.parse_query()?;
- self.expect_token(&Token::RParen)?;
- Ok(Expr::Function(Function {
- name: ObjectName(vec![w.to_ident()]),
- parameters: FunctionArguments::None,
- args: FunctionArguments::Subquery(query),
- filter: None,
- null_treatment: None,
- over: None,
- within_group: vec![],
- }))
- }
- Keyword::NOT => self.parse_not(),
- Keyword::MATCH if dialect_of!(self is MySqlDialect |
GenericDialect) => {
- self.parse_match_against()
- }
- Keyword::STRUCT if dialect_of!(self is BigQueryDialect |
GenericDialect) => {
- self.prev_token();
- self.parse_bigquery_struct_literal()
- }
- Keyword::PRIOR if matches!(self.state, ParserState::ConnectBy)
=> {
- let expr =
self.parse_subexpr(self.dialect.prec_value(Precedence::PlusMinus))?;
- Ok(Expr::Prior(Box::new(expr)))
- }
- Keyword::MAP if self.peek_token() == Token::LBrace &&
self.dialect.support_map_literal_syntax() => {
- self.parse_duckdb_map_literal()
- }
- // Here `w` is a word, check if it's a part of a multipart
- // identifier, a function call, or a simple identifier:
- _ => match self.peek_token().token {
- Token::LParen | Token::Period => {
- let mut id_parts: Vec<Ident> = vec![w.to_ident()];
- let mut ends_with_wildcard = false;
- while self.consume_token(&Token::Period) {
- let next_token = self.next_token();
- match next_token.token {
- Token::Word(w) => id_parts.push(w.to_ident()),
- Token::Mul => {
- // Postgres explicitly allows
funcnm(tablenm.*) and the
- // function array_agg traverses this
control flow
- if dialect_of!(self is PostgreSqlDialect) {
- ends_with_wildcard = true;
- break;
- } else {
- return self
- .expected("an identifier after
'.'", next_token);
- }
- }
- Token::SingleQuotedString(s) => {
- id_parts.push(Ident::with_quote('\'', s))
- }
- _ => {
- return self
- .expected("an identifier or a '*'
after '.'", next_token);
- }
- }
+ // We first try to parse the word as the prefix of an expression.
+ // For example, the word INTERVAL in: SELECT INTERVAL '7' DAY
+ Token::Word(w) => match self.try_parse(|parser|
parser.parse_expr_by_keyword(&w)) {
Review Comment:
maybe_parse doesn't return the Err it gets, it swallows it and returns
Ok(None). In my flow I want to return the original error if the alternative
parsing branch (parse the word as identifier fails).
##########
src/parser/mod.rs:
##########
@@ -3574,6 +3597,24 @@ impl<'a> Parser<'a> {
}
}
+ /// Run a parser method `f`, reverting back to the current position if
unsuccessful
+ /// but retaining the error message if such was raised by `f`
+ pub fn try_parse<T, F>(&mut self, mut f: F) -> Result<T, ParserError>
Review Comment:
See above comment
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