fda001b6d3
materialized view def is as following: > select l_linenumber, o_custkey > from orders > left join lineitem on lineitem.L_ORDERKEY = orders.O_ORDERKEY > where o_custkey = 1; when query is as following, it can be rewritten by mv above it requires that query has reject null filters on the join right input, current supported filter are "=", "<", "<=", ">", ">=", "<=>" > select IFNULL(orders.O_CUSTKEY, 0) as custkey_not_null, > case when l_linenumber in (1,2,3) then l_linenumber else o_custkey end as case_when > from orders > inner join lineitem on orders.O_ORDERKEY = lineitem.L_ORDERKEY > where o_custkey = 1 and l_linenumber > 0;
新加case注意事项
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变量名前要写 def，否则是全局变量，并行跑的 case 的时候可能被其他 case 影响。
Problematic code:
ret = ***Correct code:
def ret = *** -
尽量不要在 case 中 global 的设置 session variable，或者修改集群配置，可能会影响其他 case。
Problematic code:
sql """set global enable_pipeline_x_engine=true;"""Correct code:
sql """set enable_pipeline_x_engine=true;""" -
如果必须要设置 global，或者要改集群配置，可以指定 case 以 nonConcurrent 的方式运行。
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case 中涉及时间相关的，最好固定时间，不要用类似 now() 函数这种动态值，避免过一段时间后 case 就跑不过了。
Problematic code:
sql """select count(*) from table where created < now();"""Correct code:
sql """select count(*) from table where created < '2023-11-13';"""