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Support TABLE functions in FROM (#253)

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Support `TABLE(...)` syntax in `FROM`, for example:

    select * from TABLE(SOME_FUNCTION(some_arg))

The ANSI spec allows routine invocations (and some other kinds of expressions we don't currently support) inside TABLE:
https://jakewheat.github.io/sql-overview/sql-2016-foundation-grammar.html#PTF-derived-table
https://jakewheat.github.io/sql-overview/sql-2016-foundation-grammar.html#table-function-derived-table
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eyalleshem 2020-08-05 08:59:43 +03:00 • committed by GitHub
parent a246d5da9a
commit 61431b087d
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3 changed files with 59 additions and 9 deletions
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13
src/parser.rs
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@ -2066,10 +2066,15 @@ impl Parser {
if !self.consume_token(&Token::LParen) {
self.expected("subquery after LATERAL", self.peek_token())?;
}
return self.parse_derived_table_factor(Lateral);
}
if self.consume_token(&Token::LParen) {
self.parse_derived_table_factor(Lateral)
} else if self.parse_keyword(Keyword::TABLE) {
// parse table function (SELECT * FROM TABLE (<expr>) [ AS <alias> ])
self.expect_token(&Token::LParen)?;
let expr = self.parse_expr()?;
self.expect_token(&Token::RParen)?;
let alias = self.parse_optional_table_alias(keywords::RESERVED_FOR_TABLE_ALIAS)?;
Ok(TableFactor::TableFunction { expr, alias })
} else if self.consume_token(&Token::LParen) {
// A left paren introduces either a derived table (i.e., a subquery)
// or a nested join. It's nearly impossible to determine ahead of
// time which it is... so we just try to parse both.