improved mysql parser. bug fixed for issue #2263

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableDiscardPartition.java

@@ -25,6 +25,7 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 public class SQLAlterTableDiscardPartition extends SQLObjectImpl implements SQLAlterTableItem {
 
     private final List<SQLName> partitions = new ArrayList<SQLName>(4);
+    private boolean tablespace;
 
     public List<SQLName> getPartitions() {
         return partitions;
@@ -44,4 +45,12 @@ public class SQLAlterTableDiscardPartition extends SQLObjectImpl implements SQLA
         }
         visitor.endVisit(this);
     }
+
+    public boolean isTablespace() {
+        return tablespace;
+    }
+
+    public void setTablespace(boolean tablespace) {
+        this.tablespace = tablespace;
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java

@@ -3712,6 +3712,11 @@ public class MySqlStatementParser extends SQLStatementParser {
                         this.exprParser.names(item.getPartitions(), item);
                     }
 
+                    if (lexer.token() == Token.TABLESPACE) {
+                        lexer.nextToken();
+                        item.setTablespace(true);
+                    }
+
                     stmt.addItem(item);
                 } else {
                     accept(Token.TABLESPACE);

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

@@ -5188,6 +5188,11 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
     public boolean visit(SQLAlterTableDiscardPartition x) {
         print0(ucase ? "DISCARD PARTITION " : "discard partition ");
         printPartitions(x.getPartitions());
+
+        if (x.isTablespace()) {
+            print0(ucase ? " TABLESPACE" : " tablespace");
+        }
+        
         return false;
     }