seawinde opened a new pull request, #34694:
URL: https://github.com/apache/doris/pull/34694
## Proposed changes
if query and mv def is as following:
def mv1_1 = """
select t1.L_LINENUMBER,t2.l_extendedprice, t2.L_ORDERKEY
from lineitem t1
inner join lineitem t2 on t1.L_ORDERKEY = t2.L_ORDERKEY;
"""
def query1_1 = """
select t1.L_LINENUMBER, t2.L_ORDERKEY
from lineitem t1
inner join lineitem t2 on t1.L_ORDERKEY = t2.L_ORDERKEY;
"""
this will generate relation mapping by Cartesian, if the num of self join
is too much, this will cause the performance problem
so we add `materialized_view_relation_mapping_max_count` session varaible,
default 8. if actual num is greater than the value, the excess relation mapping
is discarded.
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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