[TD-1476]<feature>: a demo for calcite

tests/examples/JDBC/calciteDemo/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.taosdata.example.calcite</groupId>
+    <artifactId>calciteDemo</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <!-- slf4j -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>1.7.25</version>
+            <scope>compile</scope>
+        </dependency>
+        <!-- calcite -->
+        <dependency>
+            <groupId>org.apache.calcite</groupId>
+            <artifactId>calcite-core</artifactId>
+            <version>1.23.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-dbcp2</artifactId>
+            <version>2.7.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.calcite.avatica</groupId>
+            <artifactId>avatica-core</artifactId>
+            <version>1.17.0</version>
+        </dependency>
+
+        <!-- mysql -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>5.1.47</version>
+        </dependency>
+
+        <!-- tdengine -->
+        <dependency>
+            <groupId>com.taosdata.jdbc</groupId>
+            <artifactId>taos-jdbcdriver</artifactId>
+            <version>2.0.7</version>
+        </dependency>
+
+    </dependencies>
+
+
+</project>
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tests/examples/JDBC/calciteDemo/src/main/java/com/taosdata/example/calcite/CalciteDemo.java

+package com.taosdata.example.calcite;
+
+import org.apache.calcite.adapter.jdbc.JdbcSchema;
+import org.apache.calcite.jdbc.CalciteConnection;
+import org.apache.calcite.schema.Schema;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.calcite.sql.parser.SqlParseException;
+import org.apache.commons.dbcp2.BasicDataSource;
+
+import java.sql.*;
+import java.util.Properties;
+
+public class CalciteDemo {
+
+    private static String url_taos = "jdbc:TAOS://192.168.236.135:6030/test";
+    private static String url_mysql = "jdbc:mysql://master:3306/test?useSSL=false&useUnicode=true&characterEncoding=UTF-8";
+
+    public static void main(String[] args) throws SqlParseException, ClassNotFoundException, SQLException {
+        Class.forName("org.apache.calcite.jdbc.Driver");
+        Properties info = new Properties();
+        info.setProperty("caseSensitive", "false");
+
+        Connection connection = DriverManager.getConnection("jdbc:calcite:", info);
+        CalciteConnection calciteConnection = connection.unwrap(CalciteConnection.class);
+
+        SchemaPlus rootSchema = calciteConnection.getRootSchema();
+
+        //这里hdb是在tdengine中创建的数据库名
+        Schema schema = mysqlTest(rootSchema);
+//        Schema schema = tdengineTest(rootSchema);
+
+        //创建新的schema自动映射到原来的hdb数据库
+        rootSchema.add("test", schema);
+
+        Statement stmt = calciteConnection.createStatement();
+        //查询schema test中的表，表名是tdengine中的表
+        ResultSet rs = stmt.executeQuery("select * from test.t");
+        ResultSetMetaData metaData = rs.getMetaData();
+        while (rs.next()) {
+            for (int i = 1; i <= metaData.getColumnCount(); i++) {
+                System.out.println(metaData.getColumnLabel(i) + " : " + rs.getString(i));
+            }
+        }
+    }
+
+
+    private static Schema tdengineTest(SchemaPlus rootSchema) throws ClassNotFoundException {
+        Class.forName("com.taosdata.jdbc.TSDBDriver");
+        BasicDataSource dataSource = new BasicDataSource();
+        dataSource.setUrl(url_taos);
+        dataSource.setUsername("root");
+        dataSource.setPassword("taosdata");
+
+        return JdbcSchema.create(rootSchema, "test", dataSource, "hdb", null);
+    }
+
+    private static Schema mysqlTest(SchemaPlus rootSchema) throws ClassNotFoundException {
+        Class.forName("com.mysql.jdbc.Driver");
+        BasicDataSource dataSource = new BasicDataSource();
+        dataSource.setUrl(url_mysql);
+        dataSource.setUsername("root");
+        dataSource.setPassword("123456");
+
+        //Schema schema = JdbcSchema.create(rootSchema, "test", dataSource, "hdb", null);
+        return JdbcSchema.create(rootSchema, "test", dataSource, "test", null);
+    }
+}

tests/examples/JDBC/calciteDemo/src/main/resources/log4j.properties

+log4j.rootLogger=info,stdout
+
+#console
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender 
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 
+log4j.appender.stdout.layout.ConversionPattern= [%d{yyyy-MM-dd HH:mm:ss a}]:%p %l%m%n
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