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Support specifying ASC/DESC in index columns (#249)

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...by reusing `OrderByExpr` for `columns` in `Statement::CreateIndex`.

This supports SQLite's indexed-column syntax https://www.sqlite.org/syntax/indexed-column.html

MSSQL's (`ON <object> ( column [ ASC | DESC ] [ ,...n ] )`)
https://docs.microsoft.com/en-us/sql/t-sql/statements/create-index-transact-sql?view=sql-server-ver15

And most of PostgreSQL syntax (except for opclass):
`( { column_name | ( expression ) } [ COLLATE collation ] [ opclass ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] )`
https://www.postgresql.org/docs/12/sql-createindex.html
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mz 2020-07-30 20:37:58 +08:00 • committed by GitHub
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src/parser.rs
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@ -1142,7 +1142,9 @@ impl Parser {
let index_name = self.parse_object_name()?;
self.expect_keyword(Keyword::ON)?;
let table_name = self.parse_object_name()?;
let columns = self.parse_parenthesized_column_list(Mandatory)?;
self.expect_token(&Token::LParen)?;
let columns = self.parse_comma_separated(Parser::parse_order_by_expr)?;
self.expect_token(&Token::RParen)?;
Ok(Statement::CreateIndex {
name: index_name,
table_name,