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This exception is being thrown by the PostgreSQL 8.3.7 server to my application.
Does anyone know what this error means and what I can do about it?
ERROR: cached plan must not change result type
STATEMENT: select code,is_deprecated from country where code=$1
I figured out what was causing this error.
My application opened a database connection and prepared a SELECT statement for execution.
Meanwhile, another script was modifying the database table, changing the data type of one of the columns being returned in the above SELECT statement.
I resolved this by restarting the application after the database table was modified. This reset the database connection, allowing the prepared statement to execute without errors.