1. When doing harvesting, raise the gp_max_csv_line_length to
maximum legal value in session level.
2. For query longer than gp_max_csv_line_length, this workaround
replaces line breaks in query text with space to prevent load
failure. It may lead long query statement changed when load to
history table, but it is still better than fail to load or truncate
the query text.

Co-authored-by: Teng Zhang tezhang@pivotal.io
Co-authored-by: Hao Wang haowang@pivotal.io