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nebula 版本：1.0.1
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部署方式：分布式 3台机器，每台机器各有meta，storage，graph
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硬件信息：无关
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出问题的 Space 的创建方式：
CREATE SPACE nba_hive (partition_num = 10, replica_factor = 1, charset = utf8, collate = utf8_bin);
USE nba_hive;
CREATE TAG player ( id int, name string, age int );
CREATE TAG team ( id int, name string );
CREATE EDGE follow ( source_id int, target_id int, degree int );
CREATE EDGE serve ( source_id int, target_id int, ranking int, start_year int, end_year int );
CREATE TAG INDEX player_index_0 ON player(name)
insert vertex player(id, name, age) values 1001:(1001, 'AAA', 20)
insert vertex player(id, name, age) values 1002:(1002, 'BBB', 20)
insert vertex player(id, name, age) values 1003:(1003, 'CCC', 20)
insert edge follow(source_id, target_id, degree) values 1001->1002:(1001, 1002, 1)
insert edge follow(source_id, target_id, degree) values 1001->1003:(1001, 1003, 1)
- 问题的具体描述：
Case 1：
$var1 = go from 1001 over follow yield follow._dst as dst;
$var2 = yield left((string)$var1.dst, 4) + "x" union yield left((string)$var1.dst, 4) + "y";
yield $var2.*;
上述语句返回正常结果，符合预期。
Case 2：
$var1 = go from 1001 over follow yield follow._dst as dst;
$var2 = yield left($var1.dst, 4) + "x";
yield $var2.*;
现象：
[ERROR (-8)]: Exception when handle out-bounds/in-bounds: N5boost16exception_detail10clone_implINS0_19error_info_injectorINS_7bad_getEEEEE: boost::bad_get: failed value get using boost::get.
问题：
提示信息不友好，语句的错误是传入left函数的参数非string类型，是否可以优化。
Case 3：
$var1 = go from 1001 over follow yield follow._dst as dst;
$var2 = yield left((string)$var1.dst, 4) + "x" union yield left($var1.dst, 4) + "y";
yield $var2.*;
现象：长时间hang住不动。
问题：UNION子句中存在运行时错误时hang住，迅速耗尽线程池且无错误提示，难以排查问题，是否可以优化。