Add tests for EXPLAIN, CALL, DO, LOAD DATA parsers

57 new tests covering:
- EXPLAIN SELECT/INSERT/UPDATE/DELETE, EXPLAIN ANALYZE, FORMAT=JSON/TREE
- DESCRIBE/DESC table, EXPLAIN table shorthand
- PostgreSQL EXPLAIN (ANALYZE, VERBOSE, FORMAT JSON)
- CALL with no args, with args, qualified schema.proc
- DO literal, function, multiple expressions
- LOAD DATA basic, LOCAL, REPLACE, FIELDS TERMINATED BY
- Round-trip emission tests for all statement types
- Bulk data-driven parameterized tests (20 cases)
- Updates classifier test: EXPLAIN now correctly classifies as EXPLAIN

Author: renecannao

Makefile.new

@@ -32,7 +32,8 @@ TEST_SRCS = $(TEST_DIR)/test_main.cpp \
             $(TEST_DIR)/test_update.cpp \
             $(TEST_DIR)/test_delete.cpp \
             $(TEST_DIR)/test_compound.cpp \
-            $(TEST_DIR)/test_digest.cpp
+            $(TEST_DIR)/test_digest.cpp \
+            $(TEST_DIR)/test_misc_stmts.cpp
 TEST_OBJS = $(TEST_SRCS:.cpp=.o)
 TEST_TARGET = $(PROJECT_ROOT)/run_tests
 

tests/test_classifier.cpp

@@ -131,8 +131,13 @@ TEST_F(MySQLClassifierTest, ClassifyDeallocate) {
     EXPECT_EQ(r.stmt_type, StmtType::DEALLOCATE);
 }
 
-TEST_F(MySQLClassifierTest, ClassifyUnknown) {
+TEST_F(MySQLClassifierTest, ClassifyExplain) {
     auto r = parser.parse("EXPLAIN SELECT 1", 16);
+    EXPECT_EQ(r.stmt_type, StmtType::EXPLAIN);
+}
+
+TEST_F(MySQLClassifierTest, ClassifyUnknown) {
+    auto r = parser.parse("HANDLER t1 OPEN", 15);
     EXPECT_EQ(r.stmt_type, StmtType::UNKNOWN);
 }