DERBY-6096 OutOfMemoryError with Clob or Blob hash join: DataTypeDescriptor.estimatedMemoryUsage() has no case for BLOB or CLOB so would underestimate memory usage for those types at zero 

Estimate BLOB/CLOB size at 10000 like other long types.



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1464247 13f79535-47bb-0310-9956-ffa450edef68