sachouche commented on issue #1445: DRILL-6706: fixed null pointer exception in HashJoin URL: https://github.com/apache/drill/pull/1445#issuecomment-416340872 I think the behavior introduced in DRILL-4264 needs to be fixed: - Improve the metadata to flag a column as missing (no back-tick business) - All readers should apply the same fix - This will give an opportunity to upstream operators to provide explicit handling (e.g., Filter) @ilooner, ideally the RecordBatchSizer should be using SchemaPath as keys to handle nested column names; I guess the Planner is injecting a project step to disambiguate such use-cases. For now, I let you guys decide; we either: a) Accept this temporary workaround and create a new JIRA to implement the right fix b) Fix the Parquet reader (remove the back-tick) with the side-effect that the schema-on-change behavior for filter based queries is broken c) Implement the right fix for DRILL-4264 as discussed above
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