bug fixed for visitor

src/main/java/com/alibaba/druid/sql/ast/expr/SQLInSubQueryExpr.java

@@ -70,6 +70,7 @@ public class SQLInSubQueryExpr extends SQLExprImpl implements Serializable {
     @Override
     protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {
+            acceptChild(visitor,this.expr);
             acceptChild(visitor, this.subQuery);
         }
 

src/main/java/com/alibaba/druid/sql/dialect/postgresql/ast/PGCurrentOfExpr.java

@@ -7,6 +7,14 @@ public class PGCurrentOfExpr extends PGSQLObjectImpl implements SQLExpr {
 
     private static final long serialVersionUID = 1L;
     private SQLExpr           cursor;
+    
+    public PGCurrentOfExpr() {
+        
+    }
+    
+    public PGCurrentOfExpr(SQLExpr cursor) {
+        this.cursor = cursor;
+    }
 
     public SQLExpr getCursor() {
         return cursor;

src/main/java/com/alibaba/druid/sql/dialect/postgresql/ast/PGDeleteStatement.java

@@ -14,8 +14,17 @@ public class PGDeleteStatement extends SQLDeleteStatement implements PGSQLStatem
     private PGWithClause      with;
     private boolean           only             = false;
     private List<SQLName>     using            = new ArrayList<SQLName>(2);
+    private boolean           returning;
     private String            alias;
 
+    public boolean isReturning() {
+        return returning;
+    }
+
+    public void setReturning(boolean returning) {
+        this.returning = returning;
+    }
+
     public String getAlias() {
         return alias;
     }
@@ -47,7 +56,7 @@ public class PGDeleteStatement extends SQLDeleteStatement implements PGSQLStatem
     public void setWith(PGWithClause with) {
         this.with = with;
     }
-    
+
     protected void accept0(SQLASTVisitor visitor) {
         accept0((PGASTVisitor) visitor);
     }

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGLexer.java

@@ -105,6 +105,8 @@ public class PGLexer extends Lexer {
         map.put("CASCADE", Token.CASCADE);
         map.put("RESTRICT", Token.RESTRICT);
         map.put("USING", Token.USING);
+        map.put("CURRENT", Token.CURRENT);
+        map.put("RETURNING", Token.RETURNING);
 
         DEFAULT_MYSQL_KEYWORDS = new Keywords(map);
     }

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGSQLStatementParser.java

@@ -6,6 +6,7 @@ import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
+import com.alibaba.druid.sql.dialect.postgresql.ast.PGCurrentOfExpr;
 import com.alibaba.druid.sql.dialect.postgresql.ast.PGDeleteStatement;
 import com.alibaba.druid.sql.dialect.postgresql.ast.PGTruncateStatement;
 import com.alibaba.druid.sql.parser.Lexer;
@@ -59,8 +60,23 @@ public class PGSQLStatementParser extends SQLStatementParser {
 
         if (lexer.token() == (Token.WHERE)) {
             lexer.nextToken();
-            SQLExpr where = this.exprParser.expr();
-            deleteStatement.setWhere(where);
+
+            if (lexer.token() == Token.CURRENT) {
+                lexer.nextToken();
+                accept(Token.OF);
+                SQLName cursorName = this.exprParser.name();
+                SQLExpr where = new PGCurrentOfExpr(cursorName);
+                deleteStatement.setWhere(where);
+            } else {
+                SQLExpr where = this.exprParser.expr();
+                deleteStatement.setWhere(where);
+            }
+        }
+        
+        if (lexer.token() == Token.RETURNING) {
+            lexer.nextToken();
+            accept(Token.STAR);
+            deleteStatement.setReturning(true);
         }
 
         return deleteStatement;

src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java

@@ -303,6 +303,11 @@ public class PGOutputVisitor extends SQLASTOutputVisitor implements PGASTVisitor
             print("WHERE ");
             x.getWhere().accept(this);
         }
+        
+        if (x.isReturning()) {
+            println();
+            print("RETURNING *");
+        }
 
         return false;
     }

src/main/java/com/alibaba/druid/sql/parser/Token.java

@@ -125,6 +125,8 @@ public enum Token {
     CASCADE("CASCADE"),
     RESTRICT("RESTRICT"),
     USING("USING"),
+    CURRENT("CURRENT"),
+    RETURNING("RETURNING"),
     
     // oracle
     START("START"),

src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java

@@ -11,6 +11,7 @@ import com.alibaba.druid.sql.ast.SQLObject;
 import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
 import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
+import com.alibaba.druid.sql.ast.expr.SQLInSubQueryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
@@ -364,6 +365,11 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
 
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLInSubQueryExpr x) {
+        return true;
+    }
 
     public void endVisit(SQLDeleteStatement x) {
         aliasLocal.set(null);