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feat: Support DESCRIBE table_name (#340)

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* feat: Support DESCRIBE

* feat: Support DESCRIBE table_name

* Update src/ast/mod.rs

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update src/ast/mod.rs

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

* Update src/ast/mod.rs

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
This commit is contained in:
Dmitry Patsura 2021-09-09 18:49:33 +03:00 • committed by GitHub
parent d8adb1708c
commit d2d4fc0c58
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3 changed files with 67 additions and 10 deletions
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25
src/parser.rs
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@ -141,7 +141,8 @@ impl<'a> Parser<'a> {
pub fn parse_statement(&mut self) -> Result<Statement, ParserError> {
match self.next_token() {
Token::Word(w) => match w.keyword {
Keyword::EXPLAIN => Ok(self.parse_explain()?),
Keyword::DESCRIBE => Ok(self.parse_explain(true)?),
Keyword::EXPLAIN => Ok(self.parse_explain(false)?),
Keyword::ANALYZE => Ok(self.parse_analyze()?),
Keyword::SELECT | Keyword::WITH | Keyword::VALUES => {
self.prev_token();
@ -2218,17 +2219,25 @@ impl<'a> Parser<'a> {
})
}
pub fn parse_explain(&mut self) -> Result<Statement, ParserError> {
pub fn parse_explain(&mut self, describe_alias: bool) -> Result<Statement, ParserError> {
let analyze = self.parse_keyword(Keyword::ANALYZE);
let verbose = self.parse_keyword(Keyword::VERBOSE);
let statement = Box::new(self.parse_statement()?);
if let Some(statement) = self.maybe_parse(|parser| parser.parse_statement()) {
Ok(Statement::Explain {
describe_alias,
analyze,
verbose,
statement: Box::new(statement),
})
} else {
let table_name = self.parse_object_name()?;
Ok(Statement::Explain {
analyze,
verbose,
statement,
})
Ok(Statement::ExplainTable {
describe_alias,
table_name,
})
}
}
/// Parse a query expression, i.e. a `SELECT` statement optionally