modify hbase logical of create new hbase table

hetu-docs/en/connector/HBase.md

@@ -141,7 +141,7 @@ HBase Connector supports two forms of table creation:
 
 1. Create a table and directly link to a existing table in the HBase data source.
 
-2. Create a new table that does not exist in the HBase data source.
+2. Create a new table that does not exist in the HBase data source. We must specify 'external = false'.
 
 
 Below is an example of how to create a table `schemaName.tableName` and link it to an existing table named `hbaseNamespace:hbaseTable` :

hetu-docs/zh/connector/HBase.md

@@ -132,7 +132,7 @@ HBase连接器支持两种建表形式：
 
 1. 创建表并直接链接到HBase数据源中已存在的表。
 
-2. 创建HBase数据源中不存在的新表。
+2. 创建HBase数据源中不存在的新表。我们必须指定‘external = false’。
 
 以下示例创建表`schemaName.tableName`并链接到一个名为`hbaseNamespace:hbaseTable`的现有表：
 

hetu-hbase/src/main/java/io/hetu/core/plugin/hbase/connector/HBaseConnection.java

@@ -564,6 +564,12 @@ public class HBaseConnection
                 }
             }
             else {
+                if (table.isExternal()) {
+                    throw new PrestoException(
+                            HBaseErrorCode.HBASE_CREATE_ERROR,
+                            format("Use lk creating new HBase table [%s], we must specify 'with(external=false)'. ", table.getTable()));
+                }
+
                 // create namespace if not exist
                 createNamespaceIfNotExist(this.getHbaseAdmin(), table.getSchema());
 

hetu-hbase/src/main/java/io/hetu/core/plugin/hbase/metadata/HBaseConnectorMetadata.java

@@ -177,13 +177,13 @@ public class HBaseConnectorMetadata
     {
         checkNoRollback();
         SchemaTableName tableName = tableMetadata.getTable();
-        HBaseTable table = hbaseConn.createTable(tableMetadata);
         if (HBaseTableProperties.isExternal(tableMetadata.getProperties())) {
             throw new PrestoException(
                     HBaseErrorCode.HBASE_CREATE_ERROR,
                     format("Use lk creating new HBase table [%s], we must specify 'with(external=false)'. ", tableName.toString()));
         }
 
+        HBaseTable table = hbaseConn.createTable(tableMetadata);
         // support create table xxx as select * from yyy
         HBaseTableHandle handle =
                 new HBaseTableHandle(