[CALCITE-3598] EnumerableTableScan: wrong JavaRowFormat for elementType String

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.21.0
• Fix Version/s: 1.22.0
• Labels: pull-request-available
• Assignee: Ruben Q L
• Reporter: Ruben Q L
• Created: 12/Dec/19 10:56
• Updated: 06/Mar/20 04:34
• Resolved: 13/Dec/19 07:19

Description

Problem unveiled by CALCITE-3535, and also separately by CALCITE-3576.
When CALCITE-3535 was committed, it made MaterializationTest#testJoinMaterialization8 and MaterializationTest#testJoinMaterialization9 change their execution plan from hashJoin to nestedLoopJoin. This caused an exception

java.lang.ClassCastException: java.lang.String$CaseInsensitiveComparator cannot be cast to java.lang.String

which seems unrelated to CALCITE-3535 (or CALCITE-3576), so the tests were temporarily disabled.
The goal of this ticket is to investigate the root cause of this issue and re-activate both tests.

Issue Links

• is related to: CALCITE-3576 Remove Enumerable convention check in FilterIntoJoinRule
• is related to: CALCITE-3535 EnumerableJoinRule: remove unnecessary Filter on top of INNER Join
• links to: GitHub Pull Request #1651