[DRILL-2288] ScanBatch violates IterOutcome protocol for zero-row sources [was: missing JDBC metadata (schema) for 0-row results...]

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Component/s: Storage - Information Schema
• Assignee: Daniel Barclay
• Reporter: Daniel Barclay
• Reviewer: Rahul Kumar Challapalli
• Created: 23/Feb/15 07:25
• Updated: 28/Mar/17 20:05
• Resolved: 10/Nov/15 21:53

Description

The ResultSetMetaData object from getMetadata() of a ResultSet is not set up (getColumnCount() returns zero, and trying to access any other metadata throws IndexOutOfBoundsException) for a result set with zero rows, at least for one from DatabaseMetaData.getColumns(...).

Issue Links

• incorporates: DRILL-3641 Document RecordBatch.IterOutcome (enumerators and possible sequences)
• incorporates: DRILL-3659 UnionAllRecordBatch infers wrongly from next() IterOutcome values
• incorporates: DRILL-3955 Possible bug in creation of Drill columns for HBase column families
• incorporates: DRILL-4010 In HBase reader, create child vectors for referenced HBase columns to avoid spurious schema changes
• is related to: DRILL-3631 IllegalStateException occurred when a table join another which returns empty
• is related to: DRILL-3954 HBase tests use only 1 region, don't detect bug(s) in dummy-column NullableIntVector creation/resolution
• is related to: DRILL-4001 Empty vectors from previous batch left by MapVector.load(...)/RecordBatchLoader.load(...)
• is related to: DRILL-4045 FLATTEN case in testNestedFlatten yields no rows (test didn't detect)
• is related to: DRILL-3239 Join between empty hive tables throws an IllegalStateException
• is related to: DRILL-3547 IndexOutOfBoundsException on directory with ~20 subdirectories
• is related to: DRILL-3805 Empty JSON on LHS UNION non empty JSON on RHS must return results
• relates to: DRILL-4476 Enhance Union-All operator for dealing with empty left input or empty both inputs