revise trigger

sqlTranslate/src/main/java/generator/OpenGaussGenerator.java

@@ -395,9 +395,17 @@ public class OpenGaussGenerator {
                 DataTypeConvert((TriggerDeclareContentNode) node);
             }
         }
-        for (ASTNode child : node.getChildren()) {
-            visitTrigger(child);
+        if (!(node.getFirstChild() instanceof TriggerDeclareNode || node.getFirstChild() instanceof TriggerBeginNode)) {
+            for (ASTNode child : node.getChildren()) {
+                visitTrigger(child);
+            }
         }
+        else {
+            // TODO: need to handle trigger body
+
+
+        }
+
     }
 
     private void visitPLSQL(ASTNode node) {

sqlTranslate/src/main/java/parser/ast/ASTNode.java

@@ -110,6 +110,13 @@ public abstract class ASTNode {
         return null;
     }
 
+    public ASTNode getFirstChild() {
+        if (hasChild())
+            return children.get(0);
+        else
+            return null;
+    }
+
     public List<ASTNode> getChildrenByName(String childName) {
         List<ASTNode> nodes = new ArrayList<>();
         for (ASTNode child : children) {