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(Updated Jan. 12, 2021, 9:01 p.m.) Review request for atlas, Apoorv Naik, Nikhil Bonte, Nixon Rodrigues, Pinal Shah, and Sarath Subramanian. Changes ------- Updates include: - Rebased. - Addressed review comments. Bugs: ATLAS-2932 https://issues.apache.org/jira/browse/ATLAS-2932 Repository: atlas Description ------- **Approach** General Approach: - Ensure that Gremlin-based implementation continues to function. This will ensure backward compatibility and will guarad against regressions or behavior deviations, if any, are introduced with the new implementation. - Continue using existing _GremlinQueryComposer_. - Translate the clauses to _AtlasGraphTraversal_. - Projects that were earlier handled in Gremlin query are now handled in a separate Java class. Details: - Modified: _GremlinQueryComposer_: Continue composing queries using existing claues. Additions alone. - New: _DSLQueryExecutor_ Instantiates old or new executor based on flag. - Modifed: _EntityDiscoveryService_ uses the new exectors. - New _GremlinToTraversalTranslator_: Converts Gremlin clauses to _AtlasGraphTraversal_. - Modified: _AtlasGraphTraversal_: Additional methods. - New: _SelectClauseProjections_: All queries with select operations. **Credits** - Apoorv Naik (apoorvnaik): Original implementation. - Nikhil Bonte (nbonte): Continued on Apoorv's implementation and addressed short-comings. Diffs (updated) ----- graphdb/api/src/main/java/org/apache/atlas/repository/graphdb/AtlasGraph.java c016f6340 graphdb/api/src/main/java/org/apache/atlas/repository/graphdb/AtlasGraphTraversal.java 881bb1e0f graphdb/janus/src/main/java/org/apache/atlas/repository/graphdb/janus/AtlasJanusGraph.java 0dd573b89 graphdb/janus/src/main/java/org/apache/atlas/repository/graphdb/janus/AtlasJanusGraphTraversal.java c33c4f4d0 graphdb/janus/src/test/java/org/apache/atlas/repository/graphdb/janus/GraphQueryTest.java 4b0176311 intg/src/main/java/org/apache/atlas/AtlasConfiguration.java ea9f26d47 repository/src/main/java/org/apache/atlas/discovery/EntityDiscoveryService.java 01a6c303a repository/src/main/java/org/apache/atlas/query/AtlasDSL.java b8a744b35 repository/src/main/java/org/apache/atlas/query/GremlinClause.java 9704b0f9e repository/src/main/java/org/apache/atlas/query/GremlinClauseList.java 9f30e4dc0 repository/src/main/java/org/apache/atlas/query/GremlinQuery.java 531f7ae86 repository/src/main/java/org/apache/atlas/query/GremlinQueryComposer.java 36b514e84 repository/src/main/java/org/apache/atlas/query/SelectClauseComposer.java 969fcd2b1 repository/src/main/java/org/apache/atlas/query/executors/DSLQueryExecutor.java PRE-CREATION repository/src/main/java/org/apache/atlas/query/executors/GremlinClauseToTraversalTranslator.java PRE-CREATION repository/src/main/java/org/apache/atlas/query/executors/ScriptEngineBasedExecutor.java PRE-CREATION repository/src/main/java/org/apache/atlas/query/executors/SelectClauseProjections.java PRE-CREATION repository/src/main/java/org/apache/atlas/query/executors/TraversalBasedExecutor.java PRE-CREATION repository/src/test/java/org/apache/atlas/query/DSLQueriesTest.java 3bb3b07bf Diff: https://reviews.apache.org/r/73128/diff/3/ Changes: https://reviews.apache.org/r/73128/diff/2-3/ Testing ------- **Unit Tests** - Additional tests. - _GremlinCompoerTest_ continues to validate the clause creation. - Improved validation for _minMaxCount_ tests. - Refactored: _TableValidator_ Validates output from a query with select claues. **Volume Tests** - Old implementation: 528 queries take over 10 mins to execute. - New implemeentations: 528 queries execute in 7 secs. Thanks, Ashutosh Mestry