Skip text->binary conversion of unnecessary columns in contrib/file_fdw.
When reading from a text- or CSV-format file in file_fdw, the datatype input routines can consume a significant fraction of the runtime. Often, the query does not need all the columns, so we can get a useful speed boost by skipping I/O conversion for unnecessary columns. To support this, add a "convert_selectively" option to the core COPY code. This is undocumented and not accessible from SQL (for now, anyway). Etsuro Fujita, reviewed by KaiGai Kohei Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/a36088bcfae85eeeb55e85c3f06c61cb2f0621c6 Modified Files -------------- contrib/file_fdw/file_fdw.c | 147 ++++++++++++++++++++++++++++++++++++++++++- src/backend/commands/copy.c | 53 +++++++++++++++ 2 files changed, 197 insertions(+), 3 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
