原文地址：http://shiyanjun.cn/archives/78.html

Cloudera公司已經(jīng)推出了基于Hadoop平臺(tái)的查詢統(tǒng)計(jì)分析工具Impala，只要熟悉SQL，就可以熟練地使用Impala來(lái)執(zhí)行查詢與分析的功能。不過(guò)Impala的SQL和關(guān)系數(shù)據(jù)庫(kù)的SQL還是有一點(diǎn)微妙地不同的。
下面，我們?cè)O(shè)計(jì)一個(gè)表，通過(guò)該表中的數(shù)據(jù)，來(lái)將SQL查詢與統(tǒng)計(jì)的語(yǔ)句，使用Solr查詢的方式來(lái)與SQL查詢對(duì)應(yīng)。這個(gè)翻譯的過(guò)程，是非常有趣的，你可以看到Solr一些很不錯(cuò)的功能。
用來(lái)示例的表結(jié)構(gòu)設(shè)計(jì)，如圖所示：

下面，我們通過(guò)給出一些SQL查詢統(tǒng)計(jì)語(yǔ)句，然后對(duì)應(yīng)翻譯成Solr查詢語(yǔ)句，然后對(duì)比結(jié)果。

查詢對(duì)比

• 條件組合查詢

SQL查詢語(yǔ)句：

1	SELECT?log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_type

2	FROM?v_i_event

3	WHERE?prov_id = 1?AND?net_type = 1?AND?area_id = 10304?AND?time_type = 1?AND?time_id >= 20130801?AND?time_id <= 20130815

4	ORDER?BY?log_id LIMIT 10;

查詢結(jié)果，如圖所示：

Solr查詢URL：

1	http://slave1:8888/solr-cloud/i_event/select?q=*:*&fl=log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_type&fq=prov_id:1 AND net_type:1 AND area_id:10304 AND time_type:1 AND time_id:[20130801 TO 20130815]&sort=log_id asc&start=0&rows=10

查詢結(jié)果，如下所示：

<response><lst name="responseHeader"><int name="status">0</int><int name="QTime">4</int></lst><result name="response" numFound="77" start="0"><doc><int name="log_id">6827</int><long name="start_time">1375072117</long><long name="end_time">1375081683</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">11002</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6827</int><long name="start_time">1375072117</long><long name="end_time">1375081683</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">11000</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">14001</int><int name="cnt">5</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">11002</int><int name="cnt">23</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">10200</int><int name="cnt">55</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">14000</int><int name="cnt">4</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">11000</int><int name="cnt">1</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">10201</int><int name="cnt">31</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">8002</int><int name="cnt">8</int><int name="net_type">1</int></doc><doc><int name="log_id">6851</int><long name="start_time">1375142158</long><long name="end_time">1375146391</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10304</int><int name="idt_id">8000</int><int name="cnt">30</int><int name="net_type">1</int></doc></result> </response>

對(duì)比上面結(jié)果，除了根據(jù)idt_id排序方式不同以外（Impala是升序，Solr是降序），其他是相同的。

• 單個(gè)字段分組統(tǒng)計(jì)

SQL查詢語(yǔ)句：

1	SELECT?prov_id,?SUM(cnt)?AS?sum_cnt,?AVG(cnt)?AS?avg_cnt,?MAX(cnt)?AS?max_cnt,?MIN(cnt)?ASmin_cnt,?COUNT(cnt)?AS?count_cnt

2	FROM?v_i_event

3	GROUP?BY?prov_id;

查詢結(jié)果，如圖所示：

Solr查詢URL：

1	http://slave1:8888/solr-cloud/i_event/select?q=*:*&stats=true&stats.field=cnt&rows=0&indent=true

查詢結(jié)果，如下所示：

<response><lst name="responseHeader"><int name="status">0</int><int name="QTime">2</int></lst><result name="response" numFound="4088" start="0"></result><lst name="stats"><lst name="stats_fields"><lst name="cnt"><double name="min">0.0</double><double name="max">1258.0</double><long name="count">4088</long><long name="missing">0</long><double name="sum">32587.0</double><double name="sumOfSquares">9170559.0</double><double name="mean">7.971379647749511</double><double name="stddev">46.69344567709268</double><lst name="facets" /></lst></lst></lst> </response>

對(duì)比查詢結(jié)果，Solr提供了更多的統(tǒng)計(jì)項(xiàng)，如標(biāo)準(zhǔn)差（stddev）等，與SQL查詢結(jié)果是一致的。

• IN條件查詢

SQL查詢語(yǔ)句：

1	SELECT?log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_typ

2	FROM?v_i_event

3	WHERE?prov_id = 1?AND?net_type = 1?AND?city_id?IN(106,103)?AND?idt_idIN(12011,5004,6051,6056,8002)?AND?time_type = 1?AND?time_id >= 20130801?AND?time_id <= 20130815

4	ORDER?BY?log_id, start_time?DESC?LIMIT 10;

查詢結(jié)果，如圖所示：

Solr查詢URL：

http://slave1:8888/solr-cloud/i_event/select?q=*:*&fl=log_id,start_time,end_time,prov_id,city_id,area_id,idt_id, cnt,net_type&fq=prov_id:1 AND net_type:1 AND (city_id:106 OR city_id:103) AND (idt_id:12011 OR idt_id:5004 OR idt_id:6051 OR idt_id:6056 OR idt_id:8002) AND time_type:1 AND time_id:[20130801 TO 20130815]&sort=log_id asc ,start_time desc&start=0&rows=10

或者：

http://slave1:8888/solr-cloud/i_event/select?q=*:*&fl=log_id,start_time,end_time,prov_id,city_id,area_id,idt_id, cnt ,net_type&fq=prov_id:1&fq=net_type:1&fq=(city_id:106 OR city_id:103)&fq=(idt_id:12011 OR idt_id:5004 OR idt_id:6051 OR idt_id:6056 OR idt_id:8002)&fq=time_type:1&fq=time_id:[20130801 TO 20130815]&sort=log_id asc,start_time desc&start=0&rows=10

查詢結(jié)果，如下所示：

<response><lst name="responseHeader"><int name="status">0</int><int name="QTime">6</int></lst><result name="response" numFound="63" start="0"><doc><int name="log_id">6553</int><long name="start_time">1374054184</long><long name="end_time">1374054254</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">12011</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6553</int><long name="start_time">1374054184</long><long name="end_time">1374054254</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">5004</int><int name="cnt">2</int><int name="net_type">1</int></doc><doc><int name="log_id">6555</int><long name="start_time">1374055060</long><long name="end_time">1374055158</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">70104</int><int name="idt_id">5004</int><int name="cnt">3</int><int name="net_type">1</int></doc><doc><int name="log_id">6555</int><long name="start_time">1374055060</long><long name="end_time">1374055158</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">70104</int><int name="idt_id">12011</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6595</int><long name="start_time">1374292508</long><long name="end_time">1374292639</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">5004</int><int name="cnt">4</int><int name="net_type">1</int></doc><doc><int name="log_id">6611</int><long name="start_time">1374461233</long><long name="end_time">1374461245</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">5004</int><int name="cnt">1</int><int name="net_type">1</int></doc><doc><int name="log_id">6612</int><long name="start_time">1374461261</long><long name="end_time">1374461269</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">5004</int><int name="cnt">1</int><int name="net_type">1</int></doc><doc><int name="log_id">6612</int><long name="start_time">1374461261</long><long name="end_time">1374461269</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">12011</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6613</int><long name="start_time">1374461422</long><long name="end_time">1374461489</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">6056</int><int name="cnt">1</int><int name="net_type">1</int></doc><doc><int name="log_id">6613</int><long name="start_time">1374461422</long><long name="end_time">1374461489</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">6051</int><int name="cnt">1</int><int name="net_type">1</int></doc></result> </response>

對(duì)比查詢結(jié)果，是一致的。

• 開(kāi)區(qū)間范圍條件查詢

SQL查詢語(yǔ)句：

1	SELECT?log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_type

2	FROM?v_i_event

3	WHERE?net_type = 1?AND?idt_id?IN(12011,5004,6051,6056,8002)?AND?time_type = 1?ANDstart_time >= 1373598465?AND?end_time < 1374055254

4	ORDER?BY?log_id, start_time, idt_id?DESC?LIMIT 30;

查詢結(jié)果，如圖所示：

Solr查詢URL：

1

http://slave1:8888/solr-cloud/i_event/select?q=*:*&fl=log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_type&fq=net_type:1 AND (idt_id:12011 OR idt_id:5004 OR idt_id:6051 OR idt_id:6056 OR idt_id:8002) AND time_type:1 AND start_time:[1373598465 TO 1374055254]&fq =-start_time:1374055254&sort=log_id asc,start_time asc,idt_id desc&start=0&rows=30

或

1

http://slave1:8888/solr-cloud/i_event/select?q=*:*&fl=log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_type&fq=net_type:1 AND (idt_id:12011 OR idt_id:5004 OR idt_id:6051 OR idt_id:6056 OR idt_id:8002) AND time_type:1 AND start_time:[1373598465 TO 1374055254] AND -start_time:1374055254&sort=log_id asc,start_time asc,idt_id desc&start=0&rows=30

或

1

http://slave1:8888/solr-cloud/i_event/select?q=*:*&fl=log_id,start_time,end_time,prov_id,city_id,area_id,idt_id,cnt,net_type&fq=net_type:1&fq=idt_id:12011 OR idt_id:5004 OR idt_id:6051 OR idt_id:6056 OR idt_id:8002&fq =time_type:1&fq=start_time:[1373598465 TO 1374055254]&fq =-start_time:1374055254&sort=log_id asc,start_time asc,idt_id desc&start=0&rows=30

查詢結(jié)果，如下所示：

<response><lst name="responseHeader"><int name="status">0</int><int name="QTime">5</int></lst><result name="response" numFound="4" start="0"><doc><int name="log_id">6553</int><long name="start_time">1374054184</long><long name="end_time">1374054254</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">12011</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6553</int><long name="start_time">1374054184</long><long name="end_time">1374054254</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">10307</int><int name="idt_id">5004</int><int name="cnt">2</int><int name="net_type">1</int></doc><doc><int name="log_id">6555</int><long name="start_time">1374055060</long><long name="end_time">1374055158</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">70104</int><int name="idt_id">12011</int><int name="cnt">0</int><int name="net_type">1</int></doc><doc><int name="log_id">6555</int><long name="start_time">1374055060</long><long name="end_time">1374055158</long><int name="prov_id">1</int><int name="city_id">103</int><int name="area_id">70104</int><int name="idt_id">5004</int><int name="cnt">3</int><int name="net_type">1</int></doc></result> </response>

• 多個(gè)字段分組統(tǒng)計(jì)（只支持count函數(shù)）

SQL查詢語(yǔ)句：

1	SELECT?city_id, area_id,?COUNT(cnt)?AS?count_cnt

2	FROM?v_i_event

3	WHERE?prov_id = 1?AND?net_type = 1

4	GROUP?BY?city_id, area_id;

查詢結(jié)果，如圖所示：

Solr查詢URL：

1	http://slave1:8888/solr-cloud/i_event/select?q=*:*&facet=true&facet.pivot=city_id,area_id&fq=prov_id:1 AND net_type:1&rows=0&indent=true

查詢結(jié)果，如下所示：

<response><lst name="responseHeader"><int name="status">0</int><int name="QTime">72</int></lst><result name="response" numFound="1171" start="0"></result><lst name="facet_counts"><lst name="facet_queries" /><lst name="facet_fields" /><lst name="facet_dates" /><lst name="facet_ranges" /><lst name="facet_pivot"><arr name="city_id,area_id"><lst><str name="field">city_id</str><int name="value">103</int><int name="count">678</int><arr name="pivot"><lst><str name="field">area_id</str><int name="value">10307</int><int name="count">298</int></lst><lst><str name="field">area_id</str><int name="value">10315</int><int name="count">120</int></lst><lst><str name="field">area_id</str><int name="value">10317</int><int name="count">86</int></lst><lst><str name="field">area_id</str><int name="value">10304</int><int name="count">67</int></lst><lst><str name="field">area_id</str><int name="value">10310</int><int name="count">49</int></lst><lst><str name="field">area_id</str><int name="value">70104</int><int name="count">48</int></lst><lst><str name="field">area_id</str><int name="value">10308</int><int name="count">6</int></lst><lst><str name="field">area_id</str><int name="value">0</int><int name="count">2</int></lst><lst><str name="field">area_id</str><int name="value">10311</int><int name="count">2</int></lst></arr></lst><lst><str name="field">city_id</str><int name="value">0</int><int name="count">463</int><arr name="pivot"><lst><str name="field">area_id</str><int name="value">0</int><int name="count">395</int></lst><lst><str name="field">area_id</str><int name="value">10307</int><int name="count">68</int></lst></arr></lst><lst><str name="field">city_id</str><int name="value">106</int><int name="count">10</int><arr name="pivot"><lst><str name="field">area_id</str><int name="value">10304</int><int name="count">10</int></lst></arr></lst><lst><str name="field">city_id</str><int name="value">110</int><int name="count">8</int><arr name="pivot"><lst><str name="field">area_id</str><int name="value">0</int><int name="count">8</int></lst></arr></lst><lst><str name="field">city_id</str><int name="value">118</int><int name="count">8</int><arr name="pivot"><lst><str name="field">area_id</str><int name="value">10316</int><int name="count">8</int></lst></arr></lst><lst><str name="field">city_id</str><int name="value">105</int><int name="count">4</int><arr name="pivot"><lst><str name="field">area_id</str><int name="value">0</int><int name="count">4</int></lst></arr></lst></arr></lst></lst> </response>

對(duì)比上面結(jié)果，Solr查詢結(jié)果，需要從上面的各組中進(jìn)行合并，得到最終的統(tǒng)計(jì)結(jié)果，結(jié)果和SQL結(jié)果是一致的。

• 多個(gè)字段分組統(tǒng)計(jì)（支持count、sum、max、min等函數(shù)）

一次對(duì)多個(gè)字段進(jìn)行獨(dú)立分組統(tǒng)計(jì)，Solr可以很好的支持。這相當(dāng)于執(zhí)行兩個(gè)帶有GROUP BY子句的SQL，這兩個(gè)GROUP BY分別只對(duì)一個(gè)字段進(jìn)行匯總統(tǒng)計(jì)。
SQL查詢語(yǔ)句：

1	SELECT?city_id, area_id,?COUNT(cnt)?AS?count_cnt

2	FROM?v_i_event

3	WHERE?prov_id = 1?AND?net_type = 1

4	GROUP?BY?city_id;

5

?

6	SELECT?city_id, area_id,?COUNT(cnt)?AS?count_cnt

7	FROM?v_i_event

8	WHERE?prov_id = 1?AND?net_type = 1

9	GROUP?BY?area_id;

查詢結(jié)果，不再顯示。
Solr查詢URL：

1	>http://slave1:8888/solr-cloud/i_event/select?q=*:*&stats=true&stats.field=cnt&f.cnt.stats.facet=city_id&&f.cnt.stats.facet=area_id&fq=prov_id:1 AND net_type:1&rows=0&indent=true

查詢結(jié)果，如下所示：

<response><lst name="responseHeader"><int name="status">0</int><int name="QTime">6</int></lst><result name="response" numFound="1171" start="0"></result><lst name="stats"><lst name="stats_fields"><lst name="cnt"><double name="min">0.0</double><double name="max">167.0</double><long name="count">1171</long><long name="missing">0</long><double name="sum">3701.0</double><double name="sumOfSquares">249641.0</double><double name="mean">3.1605465414175917</double><double name="stddev">14.260812879164407</double><lst name="facets"><lst name="city_id"><lst name="0"><double name="min">0.0</double><double name="max">167.0</double><long name="count">463</long><long name="missing">0</long><double name="sum">2783.0</double><double name="sumOfSquares">238819.0</double><double name="mean">6.010799136069115</double><double name="stddev">21.92524420257807</double><lst name="facets" /></lst><lst name="110"><double name="min">0.0</double><double name="max">1.0</double><long name="count">8</long><long name="missing">0</long><double name="sum">3.0</double><double name="sumOfSquares">3.0</double><double name="mean">0.375</double><double name="stddev">0.5175491695067657</double><lst name="facets" /></lst><lst name="106"><double name="min">0.0</double><double name="max">0.0</double><long name="count">10</long><long name="missing">0</long><double name="sum">0.0</double><double name="sumOfSquares">0.0</double><double name="mean">0.0</double><double name="stddev">0.0</double><lst name="facets" /></lst><lst name="105"><double name="min">0.0</double><double name="max">0.0</double><long name="count">4</long><long name="missing">0</long><double name="sum">0.0</double><double name="sumOfSquares">0.0</double><double name="mean">0.0</double><double name="stddev">0.0</double><lst name="facets" /></lst><lst name="103"><double name="min">0.0</double><double name="max">55.0</double><long name="count">678</long><long name="missing">0</long><double name="sum">915.0</double><double name="sumOfSquares">10819.0</double><double name="mean">1.3495575221238938</double><double name="stddev">3.7625525739676986</double><lst name="facets" /></lst><lst name="118"><double name="min">0.0</double><double name="max">0.0</double><long name="count">8</long><long name="missing">0</long><double name="sum">0.0</double><double name="sumOfSquares">0.0</double><double name="mean">0.0</double><double name="stddev">0.0</double><lst name="facets" /></lst></lst><lst name="area_id"><lst name="10308"><double name="min">0.0</double><double name="max">1.0</double><long name="count">6</long><long name="missing">0</long><double name="sum">1.0</double><double name="sumOfSquares">1.0</double><double name="mean">0.16666666666666666</double><double name="stddev">0.408248290463863</double><lst name="facets" /></lst><lst name="10310"><double name="min">0.0</double><double name="max">5.0</double><long name="count">49</long><long name="missing">0</long><double name="sum">40.0</double><double name="sumOfSquares">108.0</double><double name="mean">0.8163265306122449</double><double name="stddev">1.2528878206593208</double><lst name="facets" /></lst><lst name="0"><double name="min">0.0</double><double name="max">167.0</double><long name="count">409</long><long name="missing">0</long><double name="sum">2722.0</double><double name="sumOfSquares">238550.0</double><double name="mean">6.6552567237163816</double><double name="stddev">23.243931908854</double><lst name="facets" /></lst><lst name="10311"><double name="min">0.0</double><double name="max">0.0</double><long name="count">2</long><long name="missing">0</long><double name="sum">0.0</double><double name="sumOfSquares">0.0</double><double name="mean">0.0</double><double name="stddev">0.0</double><lst name="facets" /></lst><lst name="10304"><double name="min">0.0</double><double name="max">55.0</double><long name="count">77</long><long name="missing">0</long><double name="sum">370.0</double><double name="sumOfSquares">9476.0</double><double name="mean">4.805194805194805</double><double name="stddev">10.064318107786017</double><lst name="facets" /></lst><lst name="70104"><double name="min">0.0</double><double name="max">3.0</double><long name="count">48</long><long name="missing">0</long><double name="sum">51.0</double><double name="sumOfSquares">117.0</double><double name="mean">1.0625</double><double name="stddev">1.1560433254047038</double><lst name="facets" /></lst><lst name="10307"><double name="min">0.0</double><double name="max">12.0</double><long name="count">366</long><long name="missing">0</long><double name="sum">274.0</double><double name="sumOfSquares">768.0</double><double name="mean">0.7486338797814208</double><double name="stddev">1.2418218134151426</double><lst name="facets" /></lst><lst name="10315"><double name="min">0.0</double><double name="max">4.0</double><long name="count">120</long><long name="missing">0</long><double name="sum">143.0</double><double name="sumOfSquares">359.0</double><double name="mean">1.1916666666666667</double><double name="stddev">1.2588899560996694</double><lst name="facets" /></lst><lst name="10316"><double name="min">0.0</double><double name="max">0.0</double><long name="count">8</long><long name="missing">0</long><double name="sum">0.0</double><double name="sumOfSquares">0.0</double><double name="mean">0.0</double><double name="stddev">0.0</double><lst name="facets" /></lst><lst name="10317"><double name="min">0.0</double><double name="max">5.0</double><long name="count">86</long><long name="missing">0</long><double name="sum">100.0</double><double name="sumOfSquares">262.0</double><double name="mean">1.1627906976744187</double><double name="stddev">1.3093371930442208</double><lst name="facets" /></lst></lst></lst></lst></lst></lst> </response>

• 多個(gè)字段聯(lián)合分組統(tǒng)計(jì)（支持count、sum、max、min等函數(shù)）

SQL查詢語(yǔ)句：

1	SELECT?city_id, area_id,?SUM(cnt)?AS?sum_cnt,?AVG(cnt)?AS?avg_cnt,?MAX(cnt)?AS?max_cnt,MIN(cnt)?AS?min_cnt,?COUNT(cnt)?AS?count_cnt

2	FROM?v_i_event

3	WHERE?prov_id = 1?AND?net_type = 1

4	GROUP?BY?city_id, area_id;

查詢結(jié)果，如圖所示：

Solr目前不能簡(jiǎn)單的支持這種查詢，如果想要滿足這種查詢統(tǒng)計(jì)，需要在schema的設(shè)計(jì)上，將一個(gè)字段設(shè)置為多值，然后通過(guò)多個(gè)值進(jìn)行分組統(tǒng)計(jì)。如果應(yīng)用中查詢統(tǒng)計(jì)分析的模式比較固定，預(yù)先知道哪些字段會(huì)用于聯(lián)合分組統(tǒng)計(jì)，完全可以在設(shè)計(jì)的時(shí)候，考慮設(shè)置多值字段來(lái)滿足這種需求。

參考鏈接

• • http://wiki.apache.org/solr/SimpleFacetParameters
  • http://wiki.apache.org/solr/HierarchicalFaceting#Pivot_Facets
  • http://docs.lucidworks.com/display/solr/The+Stats+Component
  • http://docs.lucidworks.com/display/solr/Faceting

?

轉(zhuǎn)載于:https://www.cnblogs.com/davidwang456/p/4818749.html

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