环境：
1. hive版本0.13.0
2. 表test_array有数组字段例如：
select c_array from test_array where dt='2016-09-26' and size(c_array)=2 limit 2;
["105750","1246345","907964"]
["935105","359772","935104"]
3.转为字符串：
select concat_ws(',',c_array) from test_array where dt='2016-09-26' and size(c_array)=2 limit 2;
105750,1246345,907964
935105,359772,935104
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