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Support EXISTS subqueries

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Fix #5.
This commit is contained in:
Nikhil Benesch 2019-05-28 17:30:36 -04:00
parent 2308c1c6f7
commit 975106b207
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3 changed files with 53 additions and 0 deletions
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40
tests/sqlparser_common.rs
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@ -1385,6 +1385,46 @@ fn parse_scalar_subqueries() {
});
}
#[test]
fn parse_exists_subquery() {
let expected_inner = verified_query("SELECT 1");
let sql = "SELECT * FROM t WHERE EXISTS (SELECT 1)";
let select = verified_only_select(sql);
assert_eq!(
ASTNode::SQLExists(Box::new(expected_inner.clone())),
select.selection.unwrap(),
);
let sql = "SELECT * FROM t WHERE NOT EXISTS (SELECT 1)";
let select = verified_only_select(sql);
assert_eq!(
ASTNode::SQLUnary {
operator: SQLOperator::Not,
expr: Box::new(ASTNode::SQLExists(Box::new(expected_inner))),
},
select.selection.unwrap(),
);
verified_stmt("SELECT * FROM t WHERE EXISTS (WITH u AS (SELECT 1) SELECT * FROM u)");
verified_stmt("SELECT EXISTS (SELECT 1)");
let res = parse_sql_statements("SELECT EXISTS (");
assert_eq!(
ParserError::ParserError(
"Expected SELECT or a subquery in the query body, found: EOF".to_string()
),
res.unwrap_err(),
);
let res = parse_sql_statements("SELECT EXISTS (NULL)");
assert_eq!(
ParserError::ParserError(
"Expected SELECT or a subquery in the query body, found: NULL".to_string()
),
res.unwrap_err(),
);
}
#[test]
fn parse_create_view() {
let sql = "CREATE VIEW myschema.myview AS SELECT foo FROM bar";