08a71236a9
Execute SQL query statements internally(in FE). Internal-query mainly used for statistics module, FE obtains statistics by SQL from BE, such as column maximum value, minimum value, etc.
This is a tool module as statistics, it will not affect the original code, also will not affect the use of users.
The simple usage process is as follows(the following code does no exception handling):
```
String dbName = "test";
String sql = "SELECT * FROM table0";
InternalQuery query = new InternalQuery(dbName, sql);
InternalQueryResult result = query.query();
List<ResultRow> resultRows = result.getResultRows();
for (ResultRow resultRow : resultRows) {
List<String> columns = resultRow.getColumns();
for (int i = 0; i < resultRow.getColumns().size(); i++) {
resultRow.getColumnIndex(columns.get(i));
resultRow.getColumnName(i);
resultRow.getColumnType(columns.get(i));
resultRow.getColumnType(i);
resultRow.getColumnValue(columns.get(i));
resultRow.getColumnValue(i);
}
}
```
# Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. # fe-common This module is used to store some common classes of other modules. # spark-dpp This module is Spark DPP program, used for Spark Load function. Depends: fe-common # fe-core This module is the main process module of FE. Depends: fe-common, spark-dpp