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Table time travel clause support, add visit_table_factor to Visitor (#951)

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Marko Grujic 2023-08-22 12:06:32 +02:00 • committed by GitHub
parent 9500649c35
commit 1ea8858575
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15 changed files with 225 additions and 12 deletions
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18
src/parser/mod.rs
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@ -6210,6 +6210,9 @@ impl<'a> Parser<'a> {
} else {
let name = self.parse_object_name()?;
// Parse potential version qualifier
let version = self.parse_table_version()?;
// Postgres, MSSQL: table-valued functions:
let args = if self.consume_token(&Token::LParen) {
Some(self.parse_optional_args()?)
@ -6240,10 +6243,25 @@ impl<'a> Parser<'a> {
alias,
args,
with_hints,
version,
})
}
}
/// Parse a given table version specifier.
///
/// For now it only supports timestamp versioning for BigQuery and MSSQL dialects.
pub fn parse_table_version(&mut self) -> Result<Option<TableVersion>, ParserError> {
if dialect_of!(self is BigQueryDialect | MsSqlDialect)
&& self.parse_keywords(&[Keyword::FOR, Keyword::SYSTEM_TIME, Keyword::AS, Keyword::OF])
{
let expr = self.parse_expr()?;
Ok(Some(TableVersion::ForSystemTimeAsOf(expr)))
} else {
Ok(None)
}
}
pub fn parse_derived_table_factor(
&mut self,
lateral: IsLateral,