"PLAN_TABLE does not exist in the user's schema"
*Cause: Estimate_Summary_Size uses Oracle SQL "EXPLAIN PLAN"
command to estimate cardinality of the specified select-clause.
This requires a table called the PLAN_TABLE in the user's
schema. For more information refer to the SQL Reference Manual.
*Action: Create the PLAN_TABLE as described for EXPLAIN PLAN. On most
systems a script utlxplan.sql will create this table.