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Resolved c-treeSQL Panic with WHERE Clause Subqueries

A c-treeSQL query involving an ON clause with a WHERE clause containing a subquery was found to generate a panic condition with the following message:

TPEUTIL et_pexpr::psr_chg_penum penode not found 2

The query optimizer was found to incorrectly build an internal list in the processing of a query tree of this nature and has been modified to avoid this panic condition.