76fe8bfadf
Summary: - Removed BreadthFirstAtom, using EdgeAtom only with a Type enum. - Both variable expansions (breadth and depth first) now have mandatory inner node and edge Identifiers. - Both variable expansions use inline property filtering and support inline lambdas. - BFS and variable expansion now have the same planning process. - Planner modified in the following ways: - Variable expansions support inline property filtering (two filters added to all_filters, one for inline, one for post-expand). - Asserting against existing_edge since we don't support that anymore. - Edge and node symbols bound after variable expansion to disallow post-expand filters to get inlined. - Some things simplified due to different handling. - BreadthFirstExpand logical operator merged into ExpandVariable. Two Cursor classes remain and are dynamically chosen from. As part of planned planner refactor we should ensure that a filter is applied only once. The current implementation is very suboptimal for property filtering in variable expansions. @buda: we will start refactoring this these days. This current planner logic is too dense and complex. It is becoming technical debt. Most of the time I spent working on this has been spent figuring the planning out, and I still needed Teon's help at times. Implementing the correct and optimal version of query execution (avoiding multiple potentially expensive filterings) was out of reach also due to tech debt. Reviewers: buda, teon.banek Reviewed By: teon.banek Subscribers: pullbot, buda Differential Revision: https://phabricator.memgraph.io/D852 |
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