Thanks a lot Danny and Haisheng for comments on the doc ~ And more comments are welcome ~
Best, Jin XING JIN <jinxing.co...@gmail.com> 于2019年9月16日周一 下午9:17写道： > Hi Contributors, > > I'm writing this email and hope to start a discussion about > https://issues.apache.org/jira/browse/CALCITE-3334 . > > The approach of substitution-based materialized view matching is effective > for its simplicity and extensibility. But now and then we confront > materialization matching failures especially for SQLs with multiple nested > levels. We keep thinking that how many more rules still need to be added > and can we enumerate all the common matching patterns. > > The existing rules in SubstitutionVisitor & > MaterializedViewSubstitutionVisitor are created by heuristic and > experience. They are quite straightforward. But from my understanding the > design of rule set is not systematic enough. Especially compensating > Project or Filter are not given enough good care. > > I raised a doc -- > https://docs.google.com/document/d/1JpwGNFE3hw3yXb7W3-95-jXKClZC5UFPKbuhgYDuEu4 > to > propose refinement for substitution-based materialized view matching from > two aspects: > 1. Canonicalize before materialization matching; > 2. Separate matching rules into two categories and enumerate matching > patterns which need to be covered by rules. > > It's great if you can share some comments on this. > > Best, > Jin > >
