fix(grammar): fix condition and selection grammar

sbroad-core/src/frontend/sql/ast/tests.rs

@@ -141,6 +141,7 @@ fn traversal() {
 
     assert_eq!(None, dft_post.next());
 }
+
 #[test]
 fn invalid_query() {
     let query = r#"select a frAm t"#;
@@ -157,3 +158,21 @@ fn invalid_query() {
         format!("{}", ast),
     );
 }
+
+#[test]
+fn invalid_condition() {
+    let query = r#"SELECT "identification_number", "product_code" FROM "test_space" WHERE
+    "identification_number" = 1 "product_code" = 2"#;
+    let ast = AbstractSyntaxTree::new(query).unwrap_err();
+    assert_eq!(
+        format!(
+            r#"Parsing error:  --> 2:33
+  |
+2 |     "identification_number" = 1 "product_code" = 2
+  |                                 ^---
+  |
+  = expected EOI"#,
+        ),
+        format!("{}", ast),
+    )
+}

sbroad-core/src/frontend/sql/query.pest

@@ -18,11 +18,11 @@ Query = _{ Except | UnionAll | Select | Values | Insert }
                     ScanName = @{ Name }
                     Name = @{ NameString | ("\"" ~ NameString ~ "\"") }
                 Asterisk = @{ "*" }
-        Selection = { Expr+ }
+        Selection = { Expr }
         Scan = { (SubQuery | Table) ~ (^"as" ~ ScanName)? }
             Table = @{ Name }
         InnerJoin = { Scan }
-        Condition = { Expr+ }
+        Condition = { Expr }
     UnionAll = { (SubQuery | Select) ~ ^"union" ~ ^"all" ~ (SubQuery | Select) }
     Except = { (SubQuery | Select) ~ ((^"except" ~ ^"distinct") | ^"except") ~ (SubQuery | Select) }
     SubQuery = { "(" ~ (Except | UnionAll | Select | Values) ~ ")" }