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MohamedAbdeen21MohamedAbdeen21
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minor refactoring of parse_set
1 parent 6ec5223 commit 945e4ac

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10 files changed

+159
-98
lines changed

10 files changed

+159
-98
lines changed

‎src/dialect/hive.rs‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -44,6 +44,10 @@ impl Dialect for HiveDialect {
4444
true
4545
}
4646

47+
fn supports_set_multiple_values(&self) -> bool {
48+
true
49+
}
50+
4751
fn supports_numeric_prefix(&self) -> bool {
4852
true
4953
}

‎src/dialect/mod.rs‎

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -352,6 +352,12 @@ pub trait Dialect: Debug + Any {
352352
false
353353
}
354354

355+
/// Returns true if the dialect supports multiple values in a SET expression
356+
/// e.g. `SET OFFSETS SELECT, FROM, ORDER, TABLE, PROCEDURE, EXECUTE ON`
357+
fn supports_set_multiple_values(&self) -> bool {
358+
false
359+
}
360+
355361
/// Returns true if the dialects supports specifying null treatment
356362
/// as part of a window function's parameter list as opposed
357363
/// to after the parameter list.
@@ -399,6 +405,16 @@ pub trait Dialect: Debug + Any {
399405
false
400406
}
401407

408+
/// Returns true if the dialect supports multiple `SET` statements
409+
/// in a single statement.
410+
///
411+
/// ```sql
412+
/// SET variable = expression [, variable = expression];
413+
/// ```
414+
fn supports_comma_separated_set_assignments(&self) -> bool {
415+
false
416+
}
417+
402418
/// Returns true if the dialect supports an `EXCEPT` clause following a
403419
/// wildcard in a select list.
404420
///

‎src/dialect/mssql.rs‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -58,6 +58,10 @@ impl Dialect for MsSqlDialect {
5858
true
5959
}
6060

61+
fn supports_set_multiple_values(&self) -> bool {
62+
true
63+
}
64+
6165
fn supports_try_convert(&self) -> bool {
6266
true
6367
}
@@ -82,6 +86,7 @@ impl Dialect for MsSqlDialect {
8286
fn supports_start_transaction_modifier(&self) -> bool {
8387
true
8488
}
89+
8590
fn supports_end_transaction_modifier(&self) -> bool {
8691
true
8792
}

‎src/dialect/mysql.rs‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -141,6 +141,10 @@ impl Dialect for MySqlDialect {
141141
fn supports_set_names(&self) -> bool {
142142
true
143143
}
144+
145+
fn supports_comma_separated_set_assignments(&self) -> bool {
146+
true
147+
}
144148
}
145149

146150
/// `LOCK TABLES`

‎src/keywords.rs‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -173,6 +173,7 @@ define_keywords!(
173173
CHANNEL,
174174
CHAR,
175175
CHARACTER,
176+
CHARACTERISTIC,
176177
CHARACTERS,
177178
CHARACTER_LENGTH,
178179
CHARSET,
@@ -557,6 +558,7 @@ define_keywords!(
557558
MULTISET,
558559
MUTATION,
559560
NAME,
561+
NAMES,
560562
NANOSECOND,
561563
NANOSECONDS,
562564
NATIONAL,

‎src/parser/mod.rs‎

Lines changed: 87 additions & 79 deletions
Original file line numberDiff line numberDiff line change
@@ -10961,6 +10961,37 @@ impl<'a> Parser<'a> {
1096110961
})
1096210962
}
1096310963

10964+
fn parse_set_values(
10965+
&mut self,
10966+
parenthesized_assignment: bool,
10967+
) -> Result<Vec<Expr>, ParserError> {
10968+
let mut values = vec![];
10969+
10970+
if parenthesized_assignment {
10971+
self.expect_token(&Token::LParen)?;
10972+
}
10973+
10974+
loop {
10975+
let value = if let Some(expr) = self.try_parse_expr_sub_query()? {
10976+
expr
10977+
} else if let Ok(expr) = self.parse_expr() {
10978+
expr
10979+
} else {
10980+
self.expected("variable value", self.peek_token())?
10981+
};
10982+
10983+
values.push(value);
10984+
if self.consume_token(&Token::Comma) {
10985+
continue;
10986+
}
10987+
10988+
if parenthesized_assignment {
10989+
self.expect_token(&Token::RParen)?;
10990+
}
10991+
return Ok(values);
10992+
}
10993+
}
10994+
1096410995
pub fn parse_set(&mut self) -> Result<Statement, ParserError> {
1096510996
let modifier =
1096610997
self.parse_one_of_keywords(&[Keyword::SESSION, Keyword::LOCAL, Keyword::HIVEVAR]);
@@ -10989,99 +11020,76 @@ impl<'a> Parser<'a> {
1098911020
OneOrManyWithParens::One(self.parse_object_name(false)?)
1099011021
};
1099111022

10992-
let names = matches!(&variables, OneOrManyWithParens::One(variable) if variable.to_string().eq_ignore_ascii_case("NAMES"));
10993-
10994-
if names && self.dialect.supports_set_names() {
10995-
if self.parse_keyword(Keyword::DEFAULT) {
10996-
return Ok(Statement::SetNamesDefault {});
10997-
}
10998-
10999-
let charset_name = self.parse_identifier()?;
11000-
let collation_name = if self.parse_one_of_keywords(&[Keyword::COLLATE]).is_some() {
11001-
Some(self.parse_literal_string()?)
11002-
} else {
11003-
None
11004-
};
11005-
11006-
return Ok(Statement::SetNames {
11007-
charset_name,
11008-
collation_name,
11023+
if self.consume_token(&Token::Eq) || self.parse_keyword(Keyword::TO) {
11024+
let parenthesized_assignment = matches!(&variables, OneOrManyWithParens::Many(_));
11025+
let values = self.parse_set_values(parenthesized_assignment);
11026+
11027+
return Ok(Statement::SetVariable {
11028+
local: modifier == Some(Keyword::LOCAL),
11029+
hivevar: modifier == Some(Keyword::HIVEVAR),
11030+
variables,
11031+
value: values,
1100911032
});
1101011033
}
1101111034

11012-
let parenthesized_assignment = matches!(&variables, OneOrManyWithParens::Many(_));
11013-
11014-
if self.consume_token(&Token::Eq) || self.parse_keyword(Keyword::TO) {
11015-
if parenthesized_assignment {
11016-
self.expect_token(&Token::LParen)?;
11017-
}
11035+
let OneOrManyWithParens::One(variable) = variables else {
11036+
return self.expected("set variable", self.peek_token());
11037+
};
1101811038

11019-
let mut values = vec![];
11020-
loop {
11021-
let value = if let Some(expr) = self.try_parse_expr_sub_query()? {
11022-
expr
11023-
} else if let Ok(expr) = self.parse_expr() {
11024-
expr
11039+
match variable.to_string().to_ascii_uppercase().as_str() {
11040+
"NAMES" if self.dialect.supports_set_names() => {
11041+
if self.parse_keyword(Keyword::DEFAULT) {
11042+
return Ok(Statement::SetNamesDefault {});
11043+
}
11044+
let charset_name = self.parse_identifier()?;
11045+
let collation_name = if self.parse_one_of_keywords(&[Keyword::COLLATE]).is_some() {
11046+
Some(self.parse_literal_string()?)
1102511047
} else {
11026-
self.expected("variable value", self.peek_token())?
11048+
None
1102711049
};
1102811050

11029-
values.push(value);
11030-
if self.consume_token(&Token::Comma) {
11031-
continue;
11032-
}
11033-
11034-
if parenthesized_assignment {
11035-
self.expect_token(&Token::RParen)?;
11051+
return Ok(Statement::SetNames {
11052+
charset_name,
11053+
collation_name,
11054+
});
11055+
}
11056+
"TIMEZONE" => match self.parse_expr() {
11057+
Ok(expr) => {
11058+
return Ok(Statement::SetTimeZone {
11059+
local: modifier == Some(Keyword::LOCAL),
11060+
value: expr,
11061+
})
1103611062
}
11037-
return Ok(Statement::SetVariable {
11038-
local: modifier == Some(Keyword::LOCAL),
11039-
hivevar: Some(Keyword::HIVEVAR) == modifier,
11040-
variables,
11041-
value: values,
11063+
_ => return self.expected("timezone value", self.peek_token()),
11064+
},
11065+
"CHARACTERISTICS" => {
11066+
self.expect_keywords(&[Keyword::AS, Keyword::TRANSACTION])?;
11067+
return Ok(Statement::SetTransaction {
11068+
modes: self.parse_transaction_modes()?,
11069+
snapshot: None,
11070+
session: true,
1104211071
});
1104311072
}
11044-
}
11045-
11046-
let OneOrManyWithParens::One(variable) = variables else {
11047-
return self.expected("set variable", self.peek_token());
11048-
};
11049-
11050-
if variable.to_string().eq_ignore_ascii_case("TIMEZONE") {
11051-
// for some db (e.g. postgresql), SET TIME ZONE <value> is an alias for SET TIMEZONE [TO|=] <value>
11052-
match self.parse_expr() {
11053-
Ok(expr) => Ok(Statement::SetTimeZone {
11054-
local: modifier == Some(Keyword::LOCAL),
11055-
value: expr,
11056-
}),
11057-
_ => self.expected("timezone value", self.peek_token())?,
11058-
}
11059-
} else if variable.to_string() == "CHARACTERISTICS" {
11060-
self.expect_keywords(&[Keyword::AS, Keyword::TRANSACTION])?;
11061-
Ok(Statement::SetTransaction {
11062-
modes: self.parse_transaction_modes()?,
11063-
snapshot: None,
11064-
session: true,
11065-
})
11066-
} else if variable.to_string() == "TRANSACTION" && modifier.is_none() {
11067-
if self.parse_keyword(Keyword::SNAPSHOT) {
11068-
let snapshot_id = self.parse_value()?.value;
11073+
"TRANSACTION" if modifier.is_none() => {
11074+
if self.parse_keyword(Keyword::SNAPSHOT) {
11075+
let snapshot_id = self.parse_value()?.value;
11076+
return Ok(Statement::SetTransaction {
11077+
modes: vec![],
11078+
snapshot: Some(snapshot_id),
11079+
session: false,
11080+
});
11081+
}
1106911082
return Ok(Statement::SetTransaction {
11070-
modes: vec![],
11071-
snapshot: Some(snapshot_id),
11083+
modes: self.parse_transaction_modes()?,
11084+
snapshot: None,
1107211085
session: false,
1107311086
});
1107411087
}
11075-
Ok(Statement::SetTransaction {
11076-
modes: self.parse_transaction_modes()?,
11077-
snapshot: None,
11078-
session: false,
11079-
})
11080-
} else if self.dialect.supports_set_stmt_without_operator() {
11081-
self.prev_token();
11082-
self.parse_set_session_params()
11083-
} else {
11084-
self.expected("equals sign or TO", self.peek_token())
11088+
_ if self.dialect.supports_set_stmt_without_operator() => {
11089+
self.prev_token();
11090+
return self.parse_set_session_params();
11091+
}
11092+
_ => return self.expected("equals sign or TO", self.peek_token()),
1108511093
}
1108611094
}
1108711095

‎t.sql‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
SET TIME ZONE TO 'UTC'

‎tests/sqlparser_common.rs‎

Lines changed: 25 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -8618,10 +8618,10 @@ fn parse_set_variable() {
86188618
"SET (a) = ((SELECT 22 FROM tbl1, (SELECT 1 FROM tbl2)))",
86198619
"SET (a) = ((SELECT 22 FROM tbl1, (SELECT 1 FROM tbl2)))",
86208620
),
8621-
(
8622-
"SET (a, b) = ((SELECT 22 FROM tbl1, (SELECT 1 FROM tbl2)), SELECT 33 FROM tbl3)",
8623-
"SET (a, b) = ((SELECT 22 FROM tbl1, (SELECT 1 FROM tbl2)), (SELECT 33 FROM tbl3))",
8624-
),
8621+
// (
8622+
// "SET (a, b) = ((SELECT 22 FROM tbl1, (SELECT 1 FROM tbl2)), SELECT 33 FROM tbl3)",
8623+
// "SET (a, b) = ((SELECT 22 FROM tbl1, (SELECT 1 FROM tbl2)), (SELECT 33 FROM tbl3))",
8624+
// ),
86258625
] {
86268626
multi_variable_dialects.one_statement_parses_to(sql, canonical);
86278627
}
@@ -8728,20 +8728,6 @@ fn parse_set_time_zone() {
87288728
one_statement_parses_to("SET TIME ZONE TO 'UTC'", "SET TIMEZONE = 'UTC'");
87298729
}
87308730

8731-
#[test]
8732-
fn parse_set_time_zone_alias() {
8733-
match verified_stmt("SET TIME ZONE 'UTC'") {
8734-
Statement::SetTimeZone { local, value } => {
8735-
assert!(!local);
8736-
assert_eq!(
8737-
value,
8738-
Expr::Value((Value::SingleQuotedString("UTC".into())).with_empty_span())
8739-
);
8740-
}
8741-
_ => unreachable!(),
8742-
}
8743-
}
8744-
87458731
#[test]
87468732
fn parse_commit() {
87478733
match verified_stmt("COMMIT") {
@@ -14654,3 +14640,24 @@ fn parse_set_names() {
1465414640
dialects.verified_stmt("SET NAMES 'utf8'");
1465514641
dialects.verified_stmt("SET NAMES UTF8 COLLATE bogus");
1465614642
}
14643+
14644+
#[test]
14645+
fn parse_multiple_set_statements() -> Result<(), ParserError> {
14646+
let dialects = all_dialects_where(|d| d.supports_comma_separated_set_assignments());
14647+
let stmt = dialects.parse_sql_statements("SET @a = 1, b = 2")?;
14648+
14649+
let stmt = stmt[0].clone();
14650+
14651+
assert!(matches!(stmt, Statement::SetVariable { .. }));
14652+
match stmt {
14653+
Statement::SetVariable {
14654+
variables, value, ..
14655+
} => {
14656+
assert_eq!(variables.len(), 2);
14657+
assert_eq!(value.len(), 2);
14658+
}
14659+
_ => assert!(false, "Expected SetVariable with 2 variables and 2 values"),
14660+
};
14661+
14662+
Ok(())
14663+
}

‎tests/sqlparser_hive.rs‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -92,7 +92,7 @@ fn parse_msck() {
9292
}
9393

9494
#[test]
95-
fn parse_set() {
95+
fn parse_set_hivevar() {
9696
let set = "SET HIVEVAR:name = a, b, c_d";
9797
hive().verified_stmt(set);
9898
}

‎tests/sqlparser_postgres.rs‎

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5638,6 +5638,20 @@ fn parse_create_type_as_enum() {
56385638
}
56395639
}
56405640

5641+
#[test]
5642+
fn parse_set_time_zone_alias() {
5643+
match pg().verified_stmt("SET TIME ZONE 'UTC'") {
5644+
Statement::SetTimeZone { local, value } => {
5645+
assert!(!local);
5646+
assert_eq!(
5647+
value,
5648+
Expr::Value((Value::SingleQuotedString("UTC".into())).with_empty_span())
5649+
);
5650+
}
5651+
_ => unreachable!(),
5652+
}
5653+
}
5654+
56415655
#[test]
56425656
fn parse_alter_type() {
56435657
struct TestCase {

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