[regression-test](PreparedStatement) fix unstable cases when session …

…var changed

regression-test/suites/prepared_stmt_p0/prepared_stmt.groovy

@@ -58,6 +58,7 @@ suite("test_prepared_stmt", "nonConcurrent") {
         qt_sql """select * from  ${tableName} order by 1, 2, 3"""
         qt_sql """select * from  ${tableName} order by 1, 2, 3"""
         sql "set global max_prepared_stmt_count = 10000"
+        sql "set enable_fallback_to_original_planner = false"
 
         def stmt_read = prepareStatement "select * from ${tableName} where k1 = ? order by k1"
         assertEquals(com.mysql.cj.jdbc.ServerPreparedStatement, stmt_read.class)
@@ -239,5 +240,11 @@ suite("test_prepared_stmt", "nonConcurrent") {
         // not stable
         // qe_select16 stmt_read
         stmt_read.close()
+
+        stmt_read = prepareStatement "SELECT connection_id()" 
+        assertEquals(com.mysql.cj.jdbc.ServerPreparedStatement, stmt_read.class)
+        result = stmt_read.execute()
+        logger.info("connection_id: ${result}")
+        // qe_select16 stmt_read
     }
 }

regression-test/suites/prepared_stmt_p0/prepared_stmt_in_list.groovy

@@ -22,6 +22,7 @@ suite("test_prepared_stmt_in_list", "nonConcurrent") {
     def user = context.config.jdbcUser
     def password = context.config.jdbcPassword
     def url = context.config.jdbcUrl + "&useServerPrepStmts=true"
+    sql """set global max_prepared_stmt_count = 1024"""
     def result1 = connect(user=user, password=password, url=url) {
         sql """DROP TABLE IF EXISTS ${tableName} """
         sql """