Richard Zowalla created OPENJPA-3039:
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Summary: Derby: JPQL comparison of two parameters fails
Key: OPENJPA-3039
URL: https://issues.apache.org/jira/browse/OPENJPA-3039
Project: OpenJPA
Issue Type: Sub-task
Reporter: Richard Zowalla
Assignee: Richard Zowalla
On Derby, a JPQL comparison where both operands are parameters fails:
{noformat}SELECT e FROM Entity e WHERE :a = :b
42X35: It is not allowed for both operands of '=' to be ? parameters.{noformat}
Derby has {{requiresCastForComparisons}}, but JPQL parameters have type Object,
so no cast is written. The criteria API case ({{cb.equal(param, param)}} with
typed parameters) is fixed in OPENJPA-3031; the JPQL case needs the cast type
from the bound value.
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