修复聚合函数的问题 #1961
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修复聚合函数的问题 #1961
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修复聚合函数返回0的问题
修复非字符类型聚合函数返回null的问题
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当某些分片数据为空时，使用聚合函数结果异常。
1、数字类型
分片1： select min(id) from user mysql单独执行返回null
分片2： select min(id) from user mysql单独执行返回200
mycat： select min(id) from user mycat执行返回0
1、非数字类型
分片1： select min(id) from user mysql单独执行返回null
分片2： select min(id) from user mysql单独执行返回‘200’
mycat： select min(id) from user mycat执行返回null或‘200’