Made column_list as optional parameter (chimpler#6)

Author: oyarushe

aws_s3--0.0.1.sql

@@ -94,10 +94,11 @@ AS $$
  else:
  s3.download_fileobj(bucket, file_path, fd)
  fd.flush()
- res = plpy.execute("COPY {table_name} ({column_list}) FROM {filename} {options};".format(
+ formatted_column_list = "({column_list})".format(column_list=column_list) if column_list else ''
+ res = plpy.execute("COPY {table_name} {formatted_column_list} FROM {filename} {options};".format(
  table_name=table_name,
  filename=plpy.quote_literal(fd.name),
- column_list=column_list,
+ formatted_column_list=formatted_column_list,
  options=options
  )
  )
@@ -159,10 +160,11 @@ AS $$
  else:
  s3.download_fileobj(bucket, file_path, fd)
  fd.flush()
- res = plpy.execute("COPY {table_name} ({column_list}) FROM {filename} {options};".format(
+ formatted_column_list = "({column_list})".format(column_list=column_list) if column_list else ''
+ res = plpy.execute("COPY {table_name} {formatted_column_list} FROM {filename} {options};".format(
  table_name=table_name,
  filename=plpy.quote_literal(fd.name),
- column_list=column_list,
+ formatted_column_list=formatted_column_list,
  options=options
  )
  )