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sqlparser_snowflake.rs
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sqlparser_snowflake.rs
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#![warn(clippy::all)]
//! Test SQL syntax specific to Snowflake. The parser based on the
//! generic dialect is also tested (on the inputs it can handle).
use sqlparser::ast::*;
use sqlparser::dialect::{GenericDialect, SnowflakeDialect};
use sqlparser::parser::ParserError;
use sqlparser::tokenizer::*;
use test_utils::*;
#[macro_use]
mod test_utils;
#[test]
fn test_snowflake_create_table() {
let sql = "CREATE TABLE _my_$table (am00unt number)";
match snowflake_and_generic().verified_stmt(sql) {
Statement::CreateTable { name, .. } => {
assert_eq!("_my_$table", name.to_string());
}
_ => unreachable!(),
}
}
#[test]
fn test_snowflake_single_line_tokenize() {
let sql = "CREATE TABLE# this is a comment \ntable_1";
let dialect = SnowflakeDialect {};
let mut tokenizer = Tokenizer::new(&dialect, sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::make_keyword("CREATE"),
Token::Whitespace(Whitespace::Space),
Token::make_keyword("TABLE"),
Token::Whitespace(Whitespace::SingleLineComment {
prefix: "#".to_string(),
comment: " this is a comment \n".to_string(),
}),
Token::make_word("table_1", None),
];
assert_eq!(expected, tokens);
let sql = "CREATE TABLE// this is a comment \ntable_1";
let mut tokenizer = Tokenizer::new(&dialect, sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::make_keyword("CREATE"),
Token::Whitespace(Whitespace::Space),
Token::make_keyword("TABLE"),
Token::Whitespace(Whitespace::SingleLineComment {
prefix: "//".to_string(),
comment: " this is a comment \n".to_string(),
}),
Token::make_word("table_1", None),
];
assert_eq!(expected, tokens);
}
#[test]
fn test_sf_derived_table_in_parenthesis() {
// Nesting a subquery in an extra set of parentheses is non-standard,
// but supported in Snowflake SQL
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM ((SELECT 1) AS t)",
"SELECT * FROM (SELECT 1) AS t",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (((SELECT 1) AS t))",
"SELECT * FROM (SELECT 1) AS t",
);
}
#[test]
fn test_single_table_in_parenthesis() {
// Parenthesized table names are non-standard, but supported in Snowflake SQL
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN (b))",
"SELECT * FROM (a NATURAL JOIN b)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN ((b)))",
"SELECT * FROM (a NATURAL JOIN b)",
);
}
#[test]
fn test_single_table_in_parenthesis_with_alias() {
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN (b) c )",
"SELECT * FROM (a NATURAL JOIN b AS c)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN ((b)) c )",
"SELECT * FROM (a NATURAL JOIN b AS c)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN ( (b) c ) )",
"SELECT * FROM (a NATURAL JOIN b AS c)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN ( (b) as c ) )",
"SELECT * FROM (a NATURAL JOIN b AS c)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a alias1 NATURAL JOIN ( (b) c ) )",
"SELECT * FROM (a AS alias1 NATURAL JOIN b AS c)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a as alias1 NATURAL JOIN ( (b) as c ) )",
"SELECT * FROM (a AS alias1 NATURAL JOIN b AS c)",
);
snowflake_and_generic().one_statement_parses_to(
"SELECT * FROM (a NATURAL JOIN b) c",
"SELECT * FROM (a NATURAL JOIN b) AS c",
);
let res = snowflake().parse_sql_statements("SELECT * FROM (a b) c");
assert_eq!(
ParserError::ParserError("duplicate alias b".to_string()),
res.unwrap_err()
);
}
#[test]
fn parse_array() {
let sql = "SELECT CAST(a AS ARRAY) FROM customer";
let select = snowflake().verified_only_select(sql);
assert_eq!(
&Expr::Cast {
expr: Box::new(Expr::Identifier(Ident::new("a"))),
data_type: DataType::Array(None),
},
expr_from_projection(only(&select.projection))
);
}
#[test]
fn parse_json_using_colon() {
let sql = "SELECT a:b FROM t";
let select = snowflake().verified_only_select(sql);
assert_eq!(
SelectItem::UnnamedExpr(Expr::JsonAccess {
left: Box::new(Expr::Identifier(Ident::new("a"))),
operator: JsonOperator::Colon,
right: Box::new(Expr::Value(Value::UnQuotedString("b".to_string()))),
}),
select.projection[0]
);
snowflake().one_statement_parses_to("SELECT a:b::int FROM t", "SELECT CAST(a:b AS INT) FROM t");
}
#[test]
fn parse_delimited_identifiers() {
// check that quoted identifiers in any position remain quoted after serialization
let select = snowflake().verified_only_select(
r#"SELECT "alias"."bar baz", "myfun"(), "simple id" AS "column alias" FROM "a table" AS "alias""#,
);
// check FROM
match only(select.from).relation {
TableFactor::Table {
name,
alias,
args,
with_hints,
} => {
assert_eq!(vec![Ident::with_quote('"', "a table")], name.0);
assert_eq!(Ident::with_quote('"', "alias"), alias.unwrap().name);
assert!(args.is_none());
assert!(with_hints.is_empty());
}
_ => panic!("Expecting TableFactor::Table"),
}
// check SELECT
assert_eq!(3, select.projection.len());
assert_eq!(
&Expr::CompoundIdentifier(vec![
Ident::with_quote('"', "alias"),
Ident::with_quote('"', "bar baz"),
]),
expr_from_projection(&select.projection[0]),
);
assert_eq!(
&Expr::Function(Function {
name: ObjectName(vec![Ident::with_quote('"', "myfun")]),
args: vec![],
over: None,
distinct: false,
special: false,
}),
expr_from_projection(&select.projection[1]),
);
match &select.projection[2] {
SelectItem::ExprWithAlias { expr, alias } => {
assert_eq!(&Expr::Identifier(Ident::with_quote('"', "simple id")), expr);
assert_eq!(&Ident::with_quote('"', "column alias"), alias);
}
_ => panic!("Expected ExprWithAlias"),
}
snowflake().verified_stmt(r#"CREATE TABLE "foo" ("bar" "int")"#);
snowflake().verified_stmt(r#"ALTER TABLE foo ADD CONSTRAINT "bar" PRIMARY KEY (baz)"#);
//TODO verified_stmt(r#"UPDATE foo SET "bar" = 5"#);
}
#[test]
fn parse_like() {
fn chk(negated: bool) {
let sql = &format!(
"SELECT * FROM customers WHERE name {}LIKE '%a'",
if negated { "NOT " } else { "" }
);
let select = snowflake().verified_only_select(sql);
assert_eq!(
Expr::Like {
expr: Box::new(Expr::Identifier(Ident::new("name"))),
negated,
pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
escape_char: None,
},
select.selection.unwrap()
);
// Test with escape char
let sql = &format!(
"SELECT * FROM customers WHERE name {}LIKE '%a' ESCAPE '\\'",
if negated { "NOT " } else { "" }
);
let select = snowflake().verified_only_select(sql);
assert_eq!(
Expr::Like {
expr: Box::new(Expr::Identifier(Ident::new("name"))),
negated,
pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
escape_char: Some('\\'),
},
select.selection.unwrap()
);
// This statement tests that LIKE and NOT LIKE have the same precedence.
// This was previously mishandled (#81).
let sql = &format!(
"SELECT * FROM customers WHERE name {}LIKE '%a' IS NULL",
if negated { "NOT " } else { "" }
);
let select = snowflake().verified_only_select(sql);
assert_eq!(
Expr::IsNull(Box::new(Expr::Like {
expr: Box::new(Expr::Identifier(Ident::new("name"))),
negated,
pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
escape_char: None,
})),
select.selection.unwrap()
);
}
chk(false);
chk(true);
}
#[test]
fn parse_similar_to() {
fn chk(negated: bool) {
let sql = &format!(
"SELECT * FROM customers WHERE name {}SIMILAR TO '%a'",
if negated { "NOT " } else { "" }
);
let select = snowflake().verified_only_select(sql);
assert_eq!(
Expr::SimilarTo {
expr: Box::new(Expr::Identifier(Ident::new("name"))),
negated,
pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
escape_char: None,
},
select.selection.unwrap()
);
// Test with escape char
let sql = &format!(
"SELECT * FROM customers WHERE name {}SIMILAR TO '%a' ESCAPE '\\'",
if negated { "NOT " } else { "" }
);
let select = snowflake().verified_only_select(sql);
assert_eq!(
Expr::SimilarTo {
expr: Box::new(Expr::Identifier(Ident::new("name"))),
negated,
pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
escape_char: Some('\\'),
},
select.selection.unwrap()
);
// This statement tests that SIMILAR TO and NOT SIMILAR TO have the same precedence.
let sql = &format!(
"SELECT * FROM customers WHERE name {}SIMILAR TO '%a' ESCAPE '\\' IS NULL",
if negated { "NOT " } else { "" }
);
let select = snowflake().verified_only_select(sql);
assert_eq!(
Expr::IsNull(Box::new(Expr::SimilarTo {
expr: Box::new(Expr::Identifier(Ident::new("name"))),
negated,
pattern: Box::new(Expr::Value(Value::SingleQuotedString("%a".to_string()))),
escape_char: Some('\\'),
})),
select.selection.unwrap()
);
}
chk(false);
chk(true);
}
#[test]
fn test_array_agg_func() {
for sql in [
"SELECT ARRAY_AGG(x) WITHIN GROUP (ORDER BY x) AS a FROM T",
"SELECT ARRAY_AGG(DISTINCT x) WITHIN GROUP (ORDER BY x ASC) FROM tbl",
] {
snowflake().verified_stmt(sql);
}
let sql = "select array_agg(x order by x) as a from T";
let result = snowflake().parse_sql_statements(sql);
assert_eq!(
result,
Err(ParserError::ParserError(String::from(
"Expected ), found: order"
)))
)
}
fn snowflake() -> TestedDialects {
TestedDialects {
dialects: vec![Box::new(SnowflakeDialect {})],
}
}
fn snowflake_and_generic() -> TestedDialects {
TestedDialects {
dialects: vec![Box::new(SnowflakeDialect {}), Box::new(GenericDialect {})],
}
}
#[test]
fn test_select_wildcard_with_exclude() {
match snowflake_and_generic().verified_stmt("SELECT * EXCLUDE (col_a) FROM data") {
Statement::Query(query) => match *query.body {
SetExpr::Select(select) => match &select.projection[0] {
SelectItem::Wildcard(WildcardAdditionalOptions {
opt_exclude: Some(exclude),
..
}) => {
assert_eq!(
*exclude,
ExcludeSelectItem::Multiple(vec![Ident::new("col_a")])
)
}
_ => unreachable!(),
},
_ => unreachable!(),
},
_ => unreachable!(),
};
match snowflake_and_generic()
.verified_stmt("SELECT name.* EXCLUDE department_id FROM employee_table")
{
Statement::Query(query) => match *query.body {
SetExpr::Select(select) => match &select.projection[0] {
SelectItem::QualifiedWildcard(
_,
WildcardAdditionalOptions {
opt_exclude: Some(exclude),
..
},
) => {
assert_eq!(
*exclude,
ExcludeSelectItem::Single(Ident::new("department_id"))
)
}
_ => unreachable!(),
},
_ => unreachable!(),
},
_ => unreachable!(),
};
match snowflake_and_generic()
.verified_stmt("SELECT * EXCLUDE (department_id, employee_id) FROM employee_table")
{
Statement::Query(query) => match *query.body {
SetExpr::Select(select) => match &select.projection[0] {
SelectItem::Wildcard(WildcardAdditionalOptions {
opt_exclude: Some(exclude),
..
}) => {
assert_eq!(
*exclude,
ExcludeSelectItem::Multiple(vec![
Ident::new("department_id"),
Ident::new("employee_id")
])
)
}
_ => unreachable!(),
},
_ => unreachable!(),
},
_ => unreachable!(),
};
}