2.20.04.99/lts (#2222)

* fix explain result error(2042)

update mysqlVisitor  class, update getItemName, add trimHelper method and removeExtraBracket method

* delete Extra logic

* delete MysqlVisitor.class MysqlVisitor code

* update MysqlVisitor     add space for left bracket

Author: ylinzhu

copyResources.sh

@@ -0,0 +1 @@
+cp src/main/resources/* target/classes/

src/main/java/com/actiontech/dble/backend/mysql/nio/handler/builder/sqlvisitor/MysqlVisitor.java

@@ -144,25 +144,25 @@ protected String visitUnSelPushDownName(Item item, boolean canUseAlias) {
     protected String getItemName(Item item) {
         if (item instanceof ItemCondOr) {
             StringBuilder sb = new StringBuilder();
+            sb.append(" ( ");
             for (int index = 0; index < item.getArgCount(); index++) {
                 if (index > 0) {
                     sb.append(" OR ");
                 }
-                sb.append("(");
                 sb.append(getItemName(item.arguments().get(index)));
-                sb.append(")");
             }
+            sb.append(")");
             return sb.toString();
         } else if (item instanceof ItemCondAnd) {
             StringBuilder sb = new StringBuilder();
+            sb.append(" ( ");
             for (int index = 0; index < item.getArgCount(); index++) {
                 if (index > 0) {
                     sb.append(" AND ");
                 }
-                sb.append("(");
                 sb.append(getItemName(item.arguments().get(index)));
-                sb.append(")");
             }
+            sb.append(")");
             return sb.toString();
         } else if (item instanceof ItemFuncNot) {
             return " ( NOT " + getItemName(item.arguments().get(0)) + ")";