paul-rogers opened a new pull request #1813: DRILL-7306: Disable schema-only batch for new scan framework URL: https://github.com/apache/drill/pull/1813 The EVF framework is set up to return a "fast schema" empty batch with only schema as its first batch because, when the code was written, it seemed that's how we wanted operators to work. However, DRILL-7305 notes that many operators cannot handle empty batches. Since the empty-batch bugs show that Drill does not, in fact, provide a "fast schema" batch, this ticket asks to disable the feature in the new scan framework. The feature is disabled with a config option; it can be re-enabled if ever it is needed. Old tests validate the original schema-batch mode, new tests added to validate the no-schema-batch mode.
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