Add parser unit tests (81 tests) and fix IF NOT EXISTS parsing

CMakeLists.txt

@@ -137,6 +137,7 @@ if(BUILD_TESTS)
     add_cloudsql_test(columnar_table_tests tests/columnar_table_tests.cpp)
     add_cloudsql_test(heap_table_tests tests/heap_table_tests.cpp)
     add_cloudsql_test(lexer_tests tests/lexer_tests.cpp)
+    add_cloudsql_test(parser_tests tests/parser_tests.cpp)
     add_cloudsql_test(storage_manager_tests tests/storage_manager_tests.cpp)
     add_cloudsql_test(rpc_server_tests tests/rpc_server_tests.cpp)
     add_cloudsql_test(operator_tests tests/operator_tests.cpp)

Testing/Temporary/CTestCostData.txt

@@ -0,0 +1 @@
+---

include/parser/statement.hpp

@@ -221,6 +221,7 @@ class CreateTableStatement : public Statement {
    private:
     std::string table_name_;
     std::vector<ColumnDef> columns_;
+    bool if_not_exists_ = false;
 
    public:
     CreateTableStatement() = default;
@@ -232,6 +233,8 @@ class CreateTableStatement : public Statement {
         columns_.push_back({std::move(name), std::move(type), false, false, false, nullptr});
     }
     [[nodiscard]] ColumnDef& get_last_column() { return columns_.back(); }
+    void set_if_not_exists(bool v) { if_not_exists_ = v; }
+    [[nodiscard]] bool if_not_exists() const { return if_not_exists_; }
 
     [[nodiscard]] const std::string& table_name() const { return table_name_; }
     [[nodiscard]] const std::vector<ColumnDef>& columns() const { return columns_; }

src/parser/parser.cpp

@@ -287,10 +287,14 @@ std::unique_ptr<Statement> Parser::parse_create_table() {
     }
 
     /* IF NOT EXISTS */
-    if (consume(TokenType::Not)) {
+    if (consume(TokenType::If)) {
+        if (!consume(TokenType::Not)) {
+            return nullptr;
+        }
         if (!consume(TokenType::Exists)) {
             return nullptr;
         }
+        stmt->set_if_not_exists(true);
     }
 
     const Token name = next_token();