Solr6.0重要新特性解析

Posted 2021-05-02 SOLR中国

SOLR-8831: allow _version_ field to be retrievable via docValues

docValues看来是越来越成熟了，之前使用给性能造成不小的影响，这个有待测试；

继地理信息检索之后又一重大新特性，从描述上看是图数据结构检索。

SOLR-7543: Basic graph traversal query Example: {!graph from="node_id" to="edge_id"}id:doc_1

虽然join在分布式模式下不建议使用，但无法避免很多时候还是需要；

SOLR-7584: Adds Inner and LeftOuter Joins to the Streaming API and Streaming Expressions

SOLR-8188: Adds Hash and OuterHash Joins to the Streaming API and Streaming Expressions

增加jdbc驱动支持，增加多个sql特性，门槛越来越低了，也开始贴近大数据分析需求。

SOLR-7560: Parallel SQL Support

SOLR-7986: JDBC Driver for SQL Interface

SOLR-8038: Add the StatsStream to the Streaming API and wire it into the SQLHandler

SOLR-8086: Add support for SELECT DISTINCT queries to the SQL interface

SOLR-8479: Add JDBCStream to Streaming API and Streaming Expressions for integration with external data sources

SOLR-8002: Add column alias support to the Parallel SQL Interface

SOLR-8502: Improve Solr JDBC Driver to support SQL Clients like DBVisualizer

Properties props = new Properties();

props.put("aggregationMode", "map_reduce");

props.put("numWorkers", "10");

Connection con = DriverManager.getConnection("jdbc:solr://<zkhost:port>?collection=<collection>", props);

Statement stmt = con.createStatement();

ResultSet rs = stmt.executeQuery("select a, sum(b) from tablex group by a having sum(b) > 100");

while(rs.next()) {

    String a = rs.getString("a");

    double sumB = rs.getDouble("sum(b)");

}

Properties props = new Properties();

props.put("aggregationMode", "facet");

Connection con = DriverManager.getConnection("jdbc:solr://<zkhost:port>?collection=<collection>", props);

Statement stmt = con.createStatement();

ResultSet rs = stmt.executeQuery("select a, sum(b) from tablex group by a having sum(b) > 100");

while(rs.next()) {

    String a = rs.getString("a");

    double sumB = rs.getDouble("sum(b)");

}