fix: create schema table at application start

Author: dingxin-tech

src/main/java/com/aliyun/odps/MaxcomputeEmulatorApplication.java

@@ -18,13 +18,17 @@
 
 package com.aliyun.odps;
 
+import com.aliyun.odps.utils.SqlRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
+import java.sql.SQLException;
+
 @SpringBootApplication
 public class MaxcomputeEmulatorApplication {
 
-    public static void main(String[] args) {
+    public static void main(String[] args) throws SQLException {
+        SqlRunner.executeSql("CREATE TABLE IF NOT EXISTS schemas(table_name TEXT, schema TEXT);");
         SpringApplication.run(MaxcomputeEmulatorApplication.class, args);
     }
 

src/main/java/com/aliyun/odps/function/CreateTable.java

@@ -58,9 +58,6 @@ private static void run(String originSql) throws SQLException {
         walker.walk(listener, tree);
 
         SqlRunner.executeSql(listener.getResult());
-        if (!Table.of("schemas").exist()) {
-            SqlRunner.executeSql("CREATE TABLE schemas(table_name TEXT, schema TEXT);");
-        }
         SqlRunner.executeSql(
                 "INSERT INTO schemas VALUES ('" + listener.getTableName() + "', '" + listener.getSchema().toJson() +
                         "');");